e368fb4b29
this allows a clear addition of parameterization parameters that carry along marks instead of nesting multiple mark objects and destroying the possibility of creating function valued parameters, it just folders everything together into one object carrfying parameters, and the marks.
1600 lines
60 KiB
Python
1600 lines
60 KiB
Python
""" Python test discovery, setup and run of test functions. """
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from __future__ import absolute_import, division, print_function
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import fnmatch
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import inspect
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import sys
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import collections
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import math
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from itertools import count
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import py
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import pytest
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from _pytest.mark import MarkerError
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import _pytest
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import _pytest._pluggy as pluggy
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from _pytest import fixtures
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from _pytest.compat import (
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isclass, isfunction, is_generator, _escape_strings,
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REGEX_TYPE, STRING_TYPES, NoneType, NOTSET,
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get_real_func, getfslineno, safe_getattr,
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getlocation, enum,
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)
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cutdir1 = py.path.local(pluggy.__file__.rstrip("oc"))
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cutdir2 = py.path.local(_pytest.__file__).dirpath()
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cutdir3 = py.path.local(py.__file__).dirpath()
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def filter_traceback(entry):
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"""Return True if a TracebackEntry instance should be removed from tracebacks:
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* dynamically generated code (no code to show up for it);
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* internal traceback from pytest or its internal libraries, py and pluggy.
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"""
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# entry.path might sometimes return a str object when the entry
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# points to dynamically generated code
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# see https://bitbucket.org/pytest-dev/py/issues/71
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raw_filename = entry.frame.code.raw.co_filename
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is_generated = '<' in raw_filename and '>' in raw_filename
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if is_generated:
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return False
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# entry.path might point to an inexisting file, in which case it will
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# alsso return a str object. see #1133
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p = py.path.local(entry.path)
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return p != cutdir1 and not p.relto(cutdir2) and not p.relto(cutdir3)
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def pyobj_property(name):
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def get(self):
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node = self.getparent(getattr(pytest, name))
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if node is not None:
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return node.obj
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doc = "python %s object this node was collected from (can be None)." % (
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name.lower(),)
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return property(get, None, None, doc)
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def pytest_addoption(parser):
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group = parser.getgroup("general")
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group.addoption('--fixtures', '--funcargs',
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action="store_true", dest="showfixtures", default=False,
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help="show available fixtures, sorted by plugin appearance")
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group.addoption(
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'--fixtures-per-test',
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action="store_true",
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dest="show_fixtures_per_test",
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default=False,
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help="show fixtures per test",
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)
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parser.addini("usefixtures", type="args", default=[],
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help="list of default fixtures to be used with this project")
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parser.addini("python_files", type="args",
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default=['test_*.py', '*_test.py'],
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help="glob-style file patterns for Python test module discovery")
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parser.addini("python_classes", type="args", default=["Test",],
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help="prefixes or glob names for Python test class discovery")
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parser.addini("python_functions", type="args", default=["test",],
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help="prefixes or glob names for Python test function and "
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"method discovery")
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group.addoption("--import-mode", default="prepend",
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choices=["prepend", "append"], dest="importmode",
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help="prepend/append to sys.path when importing test modules, "
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"default is to prepend.")
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def pytest_cmdline_main(config):
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if config.option.showfixtures:
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showfixtures(config)
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return 0
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if config.option.show_fixtures_per_test:
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show_fixtures_per_test(config)
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return 0
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def pytest_generate_tests(metafunc):
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# those alternative spellings are common - raise a specific error to alert
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# the user
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alt_spellings = ['parameterize', 'parametrise', 'parameterise']
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for attr in alt_spellings:
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if hasattr(metafunc.function, attr):
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msg = "{0} has '{1}', spelling should be 'parametrize'"
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raise MarkerError(msg.format(metafunc.function.__name__, attr))
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try:
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markers = metafunc.function.parametrize
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except AttributeError:
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return
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for marker in markers:
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metafunc.parametrize(*marker.args, **marker.kwargs)
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def pytest_configure(config):
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config.addinivalue_line("markers",
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"parametrize(argnames, argvalues): call a test function multiple "
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"times passing in different arguments in turn. argvalues generally "
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"needs to be a list of values if argnames specifies only one name "
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"or a list of tuples of values if argnames specifies multiple names. "
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"Example: @parametrize('arg1', [1,2]) would lead to two calls of the "
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"decorated test function, one with arg1=1 and another with arg1=2."
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"see http://pytest.org/latest/parametrize.html for more info and "
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"examples."
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)
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config.addinivalue_line("markers",
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"usefixtures(fixturename1, fixturename2, ...): mark tests as needing "
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"all of the specified fixtures. see http://pytest.org/latest/fixture.html#usefixtures "
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)
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@pytest.hookimpl(trylast=True)
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def pytest_namespace():
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raises.Exception = pytest.fail.Exception
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return {
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'raises': raises,
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'approx': approx,
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'collect': {
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'Module': Module,
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'Class': Class,
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'Instance': Instance,
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'Function': Function,
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'Generator': Generator,
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}
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}
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@pytest.hookimpl(trylast=True)
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def pytest_pyfunc_call(pyfuncitem):
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testfunction = pyfuncitem.obj
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if pyfuncitem._isyieldedfunction():
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testfunction(*pyfuncitem._args)
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else:
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funcargs = pyfuncitem.funcargs
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testargs = {}
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for arg in pyfuncitem._fixtureinfo.argnames:
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testargs[arg] = funcargs[arg]
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testfunction(**testargs)
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return True
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def pytest_collect_file(path, parent):
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ext = path.ext
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if ext == ".py":
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if not parent.session.isinitpath(path):
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for pat in parent.config.getini('python_files'):
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if path.fnmatch(pat):
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break
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else:
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return
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ihook = parent.session.gethookproxy(path)
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return ihook.pytest_pycollect_makemodule(path=path, parent=parent)
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def pytest_pycollect_makemodule(path, parent):
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return Module(path, parent)
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@pytest.hookimpl(hookwrapper=True)
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def pytest_pycollect_makeitem(collector, name, obj):
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outcome = yield
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res = outcome.get_result()
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if res is not None:
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return
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# nothing was collected elsewhere, let's do it here
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if isclass(obj):
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if collector.istestclass(obj, name):
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Class = collector._getcustomclass("Class")
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outcome.force_result(Class(name, parent=collector))
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elif collector.istestfunction(obj, name):
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# mock seems to store unbound methods (issue473), normalize it
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obj = getattr(obj, "__func__", obj)
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# We need to try and unwrap the function if it's a functools.partial
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# or a funtools.wrapped.
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# We musn't if it's been wrapped with mock.patch (python 2 only)
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if not (isfunction(obj) or isfunction(get_real_func(obj))):
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collector.warn(code="C2", message=
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"cannot collect %r because it is not a function."
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% name, )
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elif getattr(obj, "__test__", True):
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if is_generator(obj):
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res = Generator(name, parent=collector)
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else:
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res = list(collector._genfunctions(name, obj))
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outcome.force_result(res)
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def pytest_make_parametrize_id(config, val, argname=None):
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return None
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class PyobjContext(object):
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module = pyobj_property("Module")
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cls = pyobj_property("Class")
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instance = pyobj_property("Instance")
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class PyobjMixin(PyobjContext):
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def obj():
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def fget(self):
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obj = getattr(self, '_obj', None)
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if obj is None:
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self._obj = obj = self._getobj()
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return obj
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def fset(self, value):
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self._obj = value
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return property(fget, fset, None, "underlying python object")
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obj = obj()
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def _getobj(self):
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return getattr(self.parent.obj, self.name)
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def getmodpath(self, stopatmodule=True, includemodule=False):
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""" return python path relative to the containing module. """
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chain = self.listchain()
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chain.reverse()
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parts = []
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for node in chain:
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if isinstance(node, Instance):
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continue
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name = node.name
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if isinstance(node, Module):
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assert name.endswith(".py")
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name = name[:-3]
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if stopatmodule:
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if includemodule:
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parts.append(name)
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break
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parts.append(name)
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parts.reverse()
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s = ".".join(parts)
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return s.replace(".[", "[")
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def _getfslineno(self):
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return getfslineno(self.obj)
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def reportinfo(self):
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# XXX caching?
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obj = self.obj
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compat_co_firstlineno = getattr(obj, 'compat_co_firstlineno', None)
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if isinstance(compat_co_firstlineno, int):
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# nose compatibility
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fspath = sys.modules[obj.__module__].__file__
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if fspath.endswith(".pyc"):
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fspath = fspath[:-1]
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lineno = compat_co_firstlineno
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else:
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fspath, lineno = getfslineno(obj)
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modpath = self.getmodpath()
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assert isinstance(lineno, int)
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return fspath, lineno, modpath
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class PyCollector(PyobjMixin, pytest.Collector):
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def funcnamefilter(self, name):
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return self._matches_prefix_or_glob_option('python_functions', name)
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def isnosetest(self, obj):
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""" Look for the __test__ attribute, which is applied by the
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@nose.tools.istest decorator
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"""
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# We explicitly check for "is True" here to not mistakenly treat
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# classes with a custom __getattr__ returning something truthy (like a
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# function) as test classes.
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return safe_getattr(obj, '__test__', False) is True
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def classnamefilter(self, name):
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return self._matches_prefix_or_glob_option('python_classes', name)
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def istestfunction(self, obj, name):
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return (
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(self.funcnamefilter(name) or self.isnosetest(obj)) and
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safe_getattr(obj, "__call__", False) and fixtures.getfixturemarker(obj) is None
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)
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def istestclass(self, obj, name):
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return self.classnamefilter(name) or self.isnosetest(obj)
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def _matches_prefix_or_glob_option(self, option_name, name):
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"""
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checks if the given name matches the prefix or glob-pattern defined
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in ini configuration.
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"""
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for option in self.config.getini(option_name):
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if name.startswith(option):
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return True
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# check that name looks like a glob-string before calling fnmatch
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# because this is called for every name in each collected module,
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# and fnmatch is somewhat expensive to call
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elif ('*' in option or '?' in option or '[' in option) and \
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fnmatch.fnmatch(name, option):
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return True
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return False
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def collect(self):
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if not getattr(self.obj, "__test__", True):
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return []
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# NB. we avoid random getattrs and peek in the __dict__ instead
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# (XXX originally introduced from a PyPy need, still true?)
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dicts = [getattr(self.obj, '__dict__', {})]
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for basecls in inspect.getmro(self.obj.__class__):
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dicts.append(basecls.__dict__)
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seen = {}
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l = []
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for dic in dicts:
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for name, obj in list(dic.items()):
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if name in seen:
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continue
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seen[name] = True
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res = self.makeitem(name, obj)
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if res is None:
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continue
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if not isinstance(res, list):
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res = [res]
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l.extend(res)
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l.sort(key=lambda item: item.reportinfo()[:2])
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return l
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def makeitem(self, name, obj):
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#assert self.ihook.fspath == self.fspath, self
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return self.ihook.pytest_pycollect_makeitem(
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collector=self, name=name, obj=obj)
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def _genfunctions(self, name, funcobj):
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module = self.getparent(Module).obj
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clscol = self.getparent(Class)
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cls = clscol and clscol.obj or None
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transfer_markers(funcobj, cls, module)
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fm = self.session._fixturemanager
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fixtureinfo = fm.getfixtureinfo(self, funcobj, cls)
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metafunc = Metafunc(funcobj, fixtureinfo, self.config,
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cls=cls, module=module)
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methods = []
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if hasattr(module, "pytest_generate_tests"):
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methods.append(module.pytest_generate_tests)
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if hasattr(cls, "pytest_generate_tests"):
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methods.append(cls().pytest_generate_tests)
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if methods:
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self.ihook.pytest_generate_tests.call_extra(methods,
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dict(metafunc=metafunc))
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else:
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self.ihook.pytest_generate_tests(metafunc=metafunc)
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Function = self._getcustomclass("Function")
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if not metafunc._calls:
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yield Function(name, parent=self, fixtureinfo=fixtureinfo)
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else:
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# add funcargs() as fixturedefs to fixtureinfo.arg2fixturedefs
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fixtures.add_funcarg_pseudo_fixture_def(self, metafunc, fm)
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for callspec in metafunc._calls:
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subname = "%s[%s]" % (name, callspec.id)
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yield Function(name=subname, parent=self,
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callspec=callspec, callobj=funcobj,
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fixtureinfo=fixtureinfo,
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keywords={callspec.id:True},
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originalname=name,
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)
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def _marked(func, mark):
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""" Returns True if :func: is already marked with :mark:, False otherwise.
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This can happen if marker is applied to class and the test file is
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invoked more than once.
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"""
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try:
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func_mark = getattr(func, mark.name)
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except AttributeError:
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return False
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return mark.args == func_mark.args and mark.kwargs == func_mark.kwargs
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def transfer_markers(funcobj, cls, mod):
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# XXX this should rather be code in the mark plugin or the mark
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# plugin should merge with the python plugin.
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for holder in (cls, mod):
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try:
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pytestmark = holder.pytestmark
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except AttributeError:
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continue
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if isinstance(pytestmark, list):
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for mark in pytestmark:
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if not _marked(funcobj, mark):
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mark(funcobj)
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else:
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if not _marked(funcobj, pytestmark):
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pytestmark(funcobj)
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class Module(pytest.File, PyCollector):
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""" Collector for test classes and functions. """
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def _getobj(self):
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return self._importtestmodule()
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def collect(self):
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self.session._fixturemanager.parsefactories(self)
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return super(Module, self).collect()
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def _importtestmodule(self):
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|
# we assume we are only called once per module
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|
importmode = self.config.getoption("--import-mode")
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|
try:
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|
mod = self.fspath.pyimport(ensuresyspath=importmode)
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|
except SyntaxError:
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|
raise self.CollectError(
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_pytest._code.ExceptionInfo().getrepr(style="short"))
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|
except self.fspath.ImportMismatchError:
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|
e = sys.exc_info()[1]
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|
raise self.CollectError(
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|
"import file mismatch:\n"
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|
"imported module %r has this __file__ attribute:\n"
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|
" %s\n"
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|
"which is not the same as the test file we want to collect:\n"
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|
" %s\n"
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|
"HINT: remove __pycache__ / .pyc files and/or use a "
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|
"unique basename for your test file modules"
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|
% e.args
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)
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|
except ImportError:
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|
from _pytest._code.code import ExceptionInfo
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|
exc_info = ExceptionInfo()
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|
if self.config.getoption('verbose') < 2:
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|
exc_info.traceback = exc_info.traceback.filter(filter_traceback)
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|
exc_repr = exc_info.getrepr(style='short') if exc_info.traceback else exc_info.exconly()
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|
formatted_tb = py._builtin._totext(exc_repr)
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|
raise self.CollectError(
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|
"ImportError while importing test module '{fspath}'.\n"
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|
"Hint: make sure your test modules/packages have valid Python names.\n"
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|
"Traceback:\n"
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|
"{traceback}".format(fspath=self.fspath, traceback=formatted_tb)
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|
)
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|
except _pytest.runner.Skipped as e:
|
|
if e.allow_module_level:
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|
raise
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|
raise self.CollectError(
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|
"Using pytest.skip outside of a test is not allowed. If you are "
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|
"trying to decorate a test function, use the @pytest.mark.skip "
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|
"or @pytest.mark.skipif decorators instead."
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|
)
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|
self.config.pluginmanager.consider_module(mod)
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|
return mod
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|
|
|
def setup(self):
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|
setup_module = _get_xunit_setup_teardown(self.obj, "setUpModule")
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|
if setup_module is None:
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|
setup_module = _get_xunit_setup_teardown(self.obj, "setup_module")
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|
if setup_module is not None:
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|
setup_module()
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|
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|
teardown_module = _get_xunit_setup_teardown(self.obj, 'tearDownModule')
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|
if teardown_module is None:
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|
teardown_module = _get_xunit_setup_teardown(self.obj, 'teardown_module')
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|
if teardown_module is not None:
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|
self.addfinalizer(teardown_module)
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|
|
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|
def _get_xunit_setup_teardown(holder, attr_name, param_obj=None):
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|
"""
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|
Return a callable to perform xunit-style setup or teardown if
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|
the function exists in the ``holder`` object.
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|
The ``param_obj`` parameter is the parameter which will be passed to the function
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|
when the callable is called without arguments, defaults to the ``holder`` object.
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|
Return ``None`` if a suitable callable is not found.
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|
"""
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|
param_obj = param_obj if param_obj is not None else holder
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|
result = _get_xunit_func(holder, attr_name)
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|
if result is not None:
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|
arg_count = result.__code__.co_argcount
|
|
if inspect.ismethod(result):
|
|
arg_count -= 1
|
|
if arg_count:
|
|
return lambda: result(param_obj)
|
|
else:
|
|
return result
|
|
|
|
|
|
def _get_xunit_func(obj, name):
|
|
"""Return the attribute from the given object to be used as a setup/teardown
|
|
xunit-style function, but only if not marked as a fixture to
|
|
avoid calling it twice.
|
|
"""
|
|
meth = getattr(obj, name, None)
|
|
if fixtures.getfixturemarker(meth) is None:
|
|
return meth
|
|
|
|
|
|
class Class(PyCollector):
|
|
""" Collector for test methods. """
|
|
def collect(self):
|
|
if not safe_getattr(self.obj, "__test__", True):
|
|
return []
|
|
if hasinit(self.obj):
|
|
self.warn("C1", "cannot collect test class %r because it has a "
|
|
"__init__ constructor" % self.obj.__name__)
|
|
return []
|
|
elif hasnew(self.obj):
|
|
self.warn("C1", "cannot collect test class %r because it has a "
|
|
"__new__ constructor" % self.obj.__name__)
|
|
return []
|
|
return [self._getcustomclass("Instance")(name="()", parent=self)]
|
|
|
|
def setup(self):
|
|
setup_class = _get_xunit_func(self.obj, 'setup_class')
|
|
if setup_class is not None:
|
|
setup_class = getattr(setup_class, 'im_func', setup_class)
|
|
setup_class = getattr(setup_class, '__func__', setup_class)
|
|
setup_class(self.obj)
|
|
|
|
fin_class = getattr(self.obj, 'teardown_class', None)
|
|
if fin_class is not None:
|
|
fin_class = getattr(fin_class, 'im_func', fin_class)
|
|
fin_class = getattr(fin_class, '__func__', fin_class)
|
|
self.addfinalizer(lambda: fin_class(self.obj))
|
|
|
|
class Instance(PyCollector):
|
|
def _getobj(self):
|
|
return self.parent.obj()
|
|
|
|
def collect(self):
|
|
self.session._fixturemanager.parsefactories(self)
|
|
return super(Instance, self).collect()
|
|
|
|
def newinstance(self):
|
|
self.obj = self._getobj()
|
|
return self.obj
|
|
|
|
class FunctionMixin(PyobjMixin):
|
|
""" mixin for the code common to Function and Generator.
|
|
"""
|
|
|
|
def setup(self):
|
|
""" perform setup for this test function. """
|
|
if hasattr(self, '_preservedparent'):
|
|
obj = self._preservedparent
|
|
elif isinstance(self.parent, Instance):
|
|
obj = self.parent.newinstance()
|
|
self.obj = self._getobj()
|
|
else:
|
|
obj = self.parent.obj
|
|
if inspect.ismethod(self.obj):
|
|
setup_name = 'setup_method'
|
|
teardown_name = 'teardown_method'
|
|
else:
|
|
setup_name = 'setup_function'
|
|
teardown_name = 'teardown_function'
|
|
setup_func_or_method = _get_xunit_setup_teardown(obj, setup_name, param_obj=self.obj)
|
|
if setup_func_or_method is not None:
|
|
setup_func_or_method()
|
|
teardown_func_or_method = _get_xunit_setup_teardown(obj, teardown_name, param_obj=self.obj)
|
|
if teardown_func_or_method is not None:
|
|
self.addfinalizer(teardown_func_or_method)
|
|
|
|
def _prunetraceback(self, excinfo):
|
|
if hasattr(self, '_obj') and not self.config.option.fulltrace:
|
|
code = _pytest._code.Code(get_real_func(self.obj))
|
|
path, firstlineno = code.path, code.firstlineno
|
|
traceback = excinfo.traceback
|
|
ntraceback = traceback.cut(path=path, firstlineno=firstlineno)
|
|
if ntraceback == traceback:
|
|
ntraceback = ntraceback.cut(path=path)
|
|
if ntraceback == traceback:
|
|
#ntraceback = ntraceback.cut(excludepath=cutdir2)
|
|
ntraceback = ntraceback.filter(filter_traceback)
|
|
if not ntraceback:
|
|
ntraceback = traceback
|
|
|
|
excinfo.traceback = ntraceback.filter()
|
|
# issue364: mark all but first and last frames to
|
|
# only show a single-line message for each frame
|
|
if self.config.option.tbstyle == "auto":
|
|
if len(excinfo.traceback) > 2:
|
|
for entry in excinfo.traceback[1:-1]:
|
|
entry.set_repr_style('short')
|
|
|
|
def _repr_failure_py(self, excinfo, style="long"):
|
|
if excinfo.errisinstance(pytest.fail.Exception):
|
|
if not excinfo.value.pytrace:
|
|
return py._builtin._totext(excinfo.value)
|
|
return super(FunctionMixin, self)._repr_failure_py(excinfo,
|
|
style=style)
|
|
|
|
def repr_failure(self, excinfo, outerr=None):
|
|
assert outerr is None, "XXX outerr usage is deprecated"
|
|
style = self.config.option.tbstyle
|
|
if style == "auto":
|
|
style = "long"
|
|
return self._repr_failure_py(excinfo, style=style)
|
|
|
|
|
|
class Generator(FunctionMixin, PyCollector):
|
|
def collect(self):
|
|
# test generators are seen as collectors but they also
|
|
# invoke setup/teardown on popular request
|
|
# (induced by the common "test_*" naming shared with normal tests)
|
|
from _pytest import deprecated
|
|
self.session._setupstate.prepare(self)
|
|
# see FunctionMixin.setup and test_setupstate_is_preserved_134
|
|
self._preservedparent = self.parent.obj
|
|
l = []
|
|
seen = {}
|
|
for i, x in enumerate(self.obj()):
|
|
name, call, args = self.getcallargs(x)
|
|
if not callable(call):
|
|
raise TypeError("%r yielded non callable test %r" %(self.obj, call,))
|
|
if name is None:
|
|
name = "[%d]" % i
|
|
else:
|
|
name = "['%s']" % name
|
|
if name in seen:
|
|
raise ValueError("%r generated tests with non-unique name %r" %(self, name))
|
|
seen[name] = True
|
|
l.append(self.Function(name, self, args=args, callobj=call))
|
|
self.config.warn('C1', deprecated.YIELD_TESTS, fslocation=self.fspath)
|
|
return l
|
|
|
|
def getcallargs(self, obj):
|
|
if not isinstance(obj, (tuple, list)):
|
|
obj = (obj,)
|
|
# explicit naming
|
|
if isinstance(obj[0], py.builtin._basestring):
|
|
name = obj[0]
|
|
obj = obj[1:]
|
|
else:
|
|
name = None
|
|
call, args = obj[0], obj[1:]
|
|
return name, call, args
|
|
|
|
|
|
def hasinit(obj):
|
|
init = getattr(obj, '__init__', None)
|
|
if init:
|
|
return init != object.__init__
|
|
|
|
|
|
def hasnew(obj):
|
|
new = getattr(obj, '__new__', None)
|
|
if new:
|
|
return new != object.__new__
|
|
|
|
|
|
class CallSpec2(object):
|
|
def __init__(self, metafunc):
|
|
self.metafunc = metafunc
|
|
self.funcargs = {}
|
|
self._idlist = []
|
|
self.params = {}
|
|
self._globalid = NOTSET
|
|
self._globalid_args = set()
|
|
self._globalparam = NOTSET
|
|
self._arg2scopenum = {} # used for sorting parametrized resources
|
|
self.keywords = {}
|
|
self.indices = {}
|
|
|
|
def copy(self, metafunc):
|
|
cs = CallSpec2(self.metafunc)
|
|
cs.funcargs.update(self.funcargs)
|
|
cs.params.update(self.params)
|
|
cs.keywords.update(self.keywords)
|
|
cs.indices.update(self.indices)
|
|
cs._arg2scopenum.update(self._arg2scopenum)
|
|
cs._idlist = list(self._idlist)
|
|
cs._globalid = self._globalid
|
|
cs._globalid_args = self._globalid_args
|
|
cs._globalparam = self._globalparam
|
|
return cs
|
|
|
|
def _checkargnotcontained(self, arg):
|
|
if arg in self.params or arg in self.funcargs:
|
|
raise ValueError("duplicate %r" %(arg,))
|
|
|
|
def getparam(self, name):
|
|
try:
|
|
return self.params[name]
|
|
except KeyError:
|
|
if self._globalparam is NOTSET:
|
|
raise ValueError(name)
|
|
return self._globalparam
|
|
|
|
@property
|
|
def id(self):
|
|
return "-".join(map(str, filter(None, self._idlist)))
|
|
|
|
def setmulti(self, valtypes, argnames, valset, id, keywords, scopenum,
|
|
param_index):
|
|
for arg,val in zip(argnames, valset):
|
|
self._checkargnotcontained(arg)
|
|
valtype_for_arg = valtypes[arg]
|
|
getattr(self, valtype_for_arg)[arg] = val
|
|
self.indices[arg] = param_index
|
|
self._arg2scopenum[arg] = scopenum
|
|
self._idlist.append(id)
|
|
self.keywords.update(keywords)
|
|
|
|
def setall(self, funcargs, id, param):
|
|
for x in funcargs:
|
|
self._checkargnotcontained(x)
|
|
self.funcargs.update(funcargs)
|
|
if id is not NOTSET:
|
|
self._idlist.append(id)
|
|
if param is not NOTSET:
|
|
assert self._globalparam is NOTSET
|
|
self._globalparam = param
|
|
for arg in funcargs:
|
|
self._arg2scopenum[arg] = fixtures.scopenum_function
|
|
|
|
|
|
class Metafunc(fixtures.FuncargnamesCompatAttr):
|
|
"""
|
|
Metafunc objects are passed to the ``pytest_generate_tests`` hook.
|
|
They help to inspect a test function and to generate tests according to
|
|
test configuration or values specified in the class or module where a
|
|
test function is defined.
|
|
"""
|
|
def __init__(self, function, fixtureinfo, config, cls=None, module=None):
|
|
#: access to the :class:`_pytest.config.Config` object for the test session
|
|
self.config = config
|
|
|
|
#: the module object where the test function is defined in.
|
|
self.module = module
|
|
|
|
#: underlying python test function
|
|
self.function = function
|
|
|
|
#: set of fixture names required by the test function
|
|
self.fixturenames = fixtureinfo.names_closure
|
|
|
|
#: class object where the test function is defined in or ``None``.
|
|
self.cls = cls
|
|
|
|
self._calls = []
|
|
self._ids = py.builtin.set()
|
|
self._arg2fixturedefs = fixtureinfo.name2fixturedefs
|
|
|
|
def parametrize(self, argnames, argvalues, indirect=False, ids=None,
|
|
scope=None):
|
|
""" Add new invocations to the underlying test function using the list
|
|
of argvalues for the given argnames. Parametrization is performed
|
|
during the collection phase. If you need to setup expensive resources
|
|
see about setting indirect to do it rather at test setup time.
|
|
|
|
:arg argnames: a comma-separated string denoting one or more argument
|
|
names, or a list/tuple of argument strings.
|
|
|
|
:arg argvalues: The list of argvalues determines how often a
|
|
test is invoked with different argument values. If only one
|
|
argname was specified argvalues is a list of values. If N
|
|
argnames were specified, argvalues must be a list of N-tuples,
|
|
where each tuple-element specifies a value for its respective
|
|
argname.
|
|
|
|
:arg indirect: The list of argnames or boolean. A list of arguments'
|
|
names (subset of argnames). If True the list contains all names from
|
|
the argnames. Each argvalue corresponding to an argname in this list will
|
|
be passed as request.param to its respective argname fixture
|
|
function so that it can perform more expensive setups during the
|
|
setup phase of a test rather than at collection time.
|
|
|
|
:arg ids: list of string ids, or a callable.
|
|
If strings, each is corresponding to the argvalues so that they are
|
|
part of the test id. If None is given as id of specific test, the
|
|
automatically generated id for that argument will be used.
|
|
If callable, it should take one argument (a single argvalue) and return
|
|
a string or return None. If None, the automatically generated id for that
|
|
argument will be used.
|
|
If no ids are provided they will be generated automatically from
|
|
the argvalues.
|
|
|
|
:arg scope: if specified it denotes the scope of the parameters.
|
|
The scope is used for grouping tests by parameter instances.
|
|
It will also override any fixture-function defined scope, allowing
|
|
to set a dynamic scope using test context or configuration.
|
|
"""
|
|
from _pytest.fixtures import scope2index
|
|
from _pytest.mark import ParameterSet
|
|
from py.io import saferepr
|
|
|
|
if not isinstance(argnames, (tuple, list)):
|
|
argnames = [x.strip() for x in argnames.split(",") if x.strip()]
|
|
force_tuple = len(argnames) == 1
|
|
else:
|
|
force_tuple = False
|
|
parameters = [
|
|
ParameterSet.extract_from(x, legacy_force_tuple=force_tuple)
|
|
for x in argvalues]
|
|
del argvalues
|
|
|
|
|
|
if not parameters:
|
|
fs, lineno = getfslineno(self.function)
|
|
reason = "got empty parameter set %r, function %s at %s:%d" % (
|
|
argnames, self.function.__name__, fs, lineno)
|
|
mark = pytest.mark.skip(reason=reason)
|
|
parameters.append(ParameterSet(
|
|
values=(NOTSET,) * len(argnames),
|
|
marks=[mark],
|
|
id=None,
|
|
))
|
|
|
|
if scope is None:
|
|
scope = _find_parametrized_scope(argnames, self._arg2fixturedefs, indirect)
|
|
|
|
scopenum = scope2index(scope, descr='call to {0}'.format(self.parametrize))
|
|
valtypes = {}
|
|
for arg in argnames:
|
|
if arg not in self.fixturenames:
|
|
if isinstance(indirect, (tuple, list)):
|
|
name = 'fixture' if arg in indirect else 'argument'
|
|
else:
|
|
name = 'fixture' if indirect else 'argument'
|
|
raise ValueError(
|
|
"%r uses no %s %r" % (
|
|
self.function, name, arg))
|
|
|
|
if indirect is True:
|
|
valtypes = dict.fromkeys(argnames, "params")
|
|
elif indirect is False:
|
|
valtypes = dict.fromkeys(argnames, "funcargs")
|
|
elif isinstance(indirect, (tuple, list)):
|
|
valtypes = dict.fromkeys(argnames, "funcargs")
|
|
for arg in indirect:
|
|
if arg not in argnames:
|
|
raise ValueError("indirect given to %r: fixture %r doesn't exist" % (
|
|
self.function, arg))
|
|
valtypes[arg] = "params"
|
|
idfn = None
|
|
if callable(ids):
|
|
idfn = ids
|
|
ids = None
|
|
if ids:
|
|
if len(ids) != len(parameters):
|
|
raise ValueError('%d tests specified with %d ids' % (
|
|
len(parameters), len(ids)))
|
|
for id_value in ids:
|
|
if id_value is not None and not isinstance(id_value, py.builtin._basestring):
|
|
msg = 'ids must be list of strings, found: %s (type: %s)'
|
|
raise ValueError(msg % (saferepr(id_value), type(id_value).__name__))
|
|
ids = idmaker(argnames, parameters, idfn, ids, self.config)
|
|
newcalls = []
|
|
for callspec in self._calls or [CallSpec2(self)]:
|
|
elements = zip(ids, parameters, count())
|
|
for a_id, param, param_index in elements:
|
|
assert len(param.values) == len(argnames)
|
|
newcallspec = callspec.copy(self)
|
|
newcallspec.setmulti(valtypes, argnames, param.values, a_id,
|
|
param.deprecated_arg_dict, scopenum, param_index)
|
|
newcalls.append(newcallspec)
|
|
self._calls = newcalls
|
|
|
|
def addcall(self, funcargs=None, id=NOTSET, param=NOTSET):
|
|
""" (deprecated, use parametrize) Add a new call to the underlying
|
|
test function during the collection phase of a test run. Note that
|
|
request.addcall() is called during the test collection phase prior and
|
|
independently to actual test execution. You should only use addcall()
|
|
if you need to specify multiple arguments of a test function.
|
|
|
|
:arg funcargs: argument keyword dictionary used when invoking
|
|
the test function.
|
|
|
|
:arg id: used for reporting and identification purposes. If you
|
|
don't supply an `id` an automatic unique id will be generated.
|
|
|
|
:arg param: a parameter which will be exposed to a later fixture function
|
|
invocation through the ``request.param`` attribute.
|
|
"""
|
|
assert funcargs is None or isinstance(funcargs, dict)
|
|
if funcargs is not None:
|
|
for name in funcargs:
|
|
if name not in self.fixturenames:
|
|
pytest.fail("funcarg %r not used in this function." % name)
|
|
else:
|
|
funcargs = {}
|
|
if id is None:
|
|
raise ValueError("id=None not allowed")
|
|
if id is NOTSET:
|
|
id = len(self._calls)
|
|
id = str(id)
|
|
if id in self._ids:
|
|
raise ValueError("duplicate id %r" % id)
|
|
self._ids.add(id)
|
|
|
|
cs = CallSpec2(self)
|
|
cs.setall(funcargs, id, param)
|
|
self._calls.append(cs)
|
|
|
|
|
|
def _find_parametrized_scope(argnames, arg2fixturedefs, indirect):
|
|
"""Find the most appropriate scope for a parametrized call based on its arguments.
|
|
|
|
When there's at least one direct argument, always use "function" scope.
|
|
|
|
When a test function is parametrized and all its arguments are indirect
|
|
(e.g. fixtures), return the most narrow scope based on the fixtures used.
|
|
|
|
Related to issue #1832, based on code posted by @Kingdread.
|
|
"""
|
|
from _pytest.fixtures import scopes
|
|
indirect_as_list = isinstance(indirect, (list, tuple))
|
|
all_arguments_are_fixtures = indirect is True or \
|
|
indirect_as_list and len(indirect) == argnames
|
|
if all_arguments_are_fixtures:
|
|
fixturedefs = arg2fixturedefs or {}
|
|
used_scopes = [fixturedef[0].scope for name, fixturedef in fixturedefs.items()]
|
|
if used_scopes:
|
|
# Takes the most narrow scope from used fixtures
|
|
for scope in reversed(scopes):
|
|
if scope in used_scopes:
|
|
return scope
|
|
|
|
return 'function'
|
|
|
|
|
|
def _idval(val, argname, idx, idfn, config=None):
|
|
if idfn:
|
|
s = None
|
|
try:
|
|
s = idfn(val)
|
|
except Exception:
|
|
# See issue https://github.com/pytest-dev/pytest/issues/2169
|
|
import warnings
|
|
msg = "Raised while trying to determine id of parameter %s at position %d." % (argname, idx)
|
|
msg += '\nUpdate your code as this will raise an error in pytest-4.0.'
|
|
warnings.warn(msg)
|
|
if s:
|
|
return _escape_strings(s)
|
|
|
|
if config:
|
|
hook_id = config.hook.pytest_make_parametrize_id(
|
|
config=config, val=val, argname=argname)
|
|
if hook_id:
|
|
return hook_id
|
|
|
|
if isinstance(val, STRING_TYPES):
|
|
return _escape_strings(val)
|
|
elif isinstance(val, (float, int, bool, NoneType)):
|
|
return str(val)
|
|
elif isinstance(val, REGEX_TYPE):
|
|
return _escape_strings(val.pattern)
|
|
elif enum is not None and isinstance(val, enum.Enum):
|
|
return str(val)
|
|
elif isclass(val) and hasattr(val, '__name__'):
|
|
return val.__name__
|
|
return str(argname)+str(idx)
|
|
|
|
def _idvalset(idx, parameterset, argnames, idfn, ids, config=None):
|
|
if parameterset.id is not None:
|
|
return parameterset.id
|
|
if ids is None or (idx >= len(ids) or ids[idx] is None):
|
|
this_id = [_idval(val, argname, idx, idfn, config)
|
|
for val, argname in zip(parameterset.values, argnames)]
|
|
return "-".join(this_id)
|
|
else:
|
|
return _escape_strings(ids[idx])
|
|
|
|
def idmaker(argnames, parametersets, idfn=None, ids=None, config=None):
|
|
ids = [_idvalset(valindex, parameterset, argnames, idfn, ids, config)
|
|
for valindex, parameterset in enumerate(parametersets)]
|
|
if len(set(ids)) != len(ids):
|
|
# The ids are not unique
|
|
duplicates = [testid for testid in ids if ids.count(testid) > 1]
|
|
counters = collections.defaultdict(lambda: 0)
|
|
for index, testid in enumerate(ids):
|
|
if testid in duplicates:
|
|
ids[index] = testid + str(counters[testid])
|
|
counters[testid] += 1
|
|
return ids
|
|
|
|
|
|
def show_fixtures_per_test(config):
|
|
from _pytest.main import wrap_session
|
|
return wrap_session(config, _show_fixtures_per_test)
|
|
|
|
|
|
def _show_fixtures_per_test(config, session):
|
|
import _pytest.config
|
|
session.perform_collect()
|
|
curdir = py.path.local()
|
|
tw = _pytest.config.create_terminal_writer(config)
|
|
verbose = config.getvalue("verbose")
|
|
|
|
def get_best_rel(func):
|
|
loc = getlocation(func, curdir)
|
|
return curdir.bestrelpath(loc)
|
|
|
|
def write_fixture(fixture_def):
|
|
argname = fixture_def.argname
|
|
|
|
if verbose <= 0 and argname.startswith("_"):
|
|
return
|
|
if verbose > 0:
|
|
bestrel = get_best_rel(fixture_def.func)
|
|
funcargspec = "{0} -- {1}".format(argname, bestrel)
|
|
else:
|
|
funcargspec = argname
|
|
tw.line(funcargspec, green=True)
|
|
|
|
INDENT = ' {0}'
|
|
fixture_doc = fixture_def.func.__doc__
|
|
|
|
if fixture_doc:
|
|
for line in fixture_doc.strip().split('\n'):
|
|
tw.line(INDENT.format(line.strip()))
|
|
else:
|
|
tw.line(INDENT.format('no docstring available'), red=True)
|
|
|
|
def write_item(item):
|
|
name2fixturedefs = item._fixtureinfo.name2fixturedefs
|
|
|
|
if not name2fixturedefs:
|
|
# The given test item does not use any fixtures
|
|
return
|
|
bestrel = get_best_rel(item.function)
|
|
|
|
tw.line()
|
|
tw.sep('-', 'fixtures used by {0}'.format(item.name))
|
|
tw.sep('-', '({0})'.format(bestrel))
|
|
for argname, fixture_defs in sorted(name2fixturedefs.items()):
|
|
assert fixture_defs is not None
|
|
if not fixture_defs:
|
|
continue
|
|
# The last fixture def item in the list is expected
|
|
# to be the one used by the test item
|
|
write_fixture(fixture_defs[-1])
|
|
|
|
for item in session.items:
|
|
write_item(item)
|
|
|
|
|
|
def showfixtures(config):
|
|
from _pytest.main import wrap_session
|
|
return wrap_session(config, _showfixtures_main)
|
|
|
|
def _showfixtures_main(config, session):
|
|
import _pytest.config
|
|
session.perform_collect()
|
|
curdir = py.path.local()
|
|
tw = _pytest.config.create_terminal_writer(config)
|
|
verbose = config.getvalue("verbose")
|
|
|
|
fm = session._fixturemanager
|
|
|
|
available = []
|
|
seen = set()
|
|
|
|
for argname, fixturedefs in fm._arg2fixturedefs.items():
|
|
assert fixturedefs is not None
|
|
if not fixturedefs:
|
|
continue
|
|
for fixturedef in fixturedefs:
|
|
loc = getlocation(fixturedef.func, curdir)
|
|
if (fixturedef.argname, loc) in seen:
|
|
continue
|
|
seen.add((fixturedef.argname, loc))
|
|
available.append((len(fixturedef.baseid),
|
|
fixturedef.func.__module__,
|
|
curdir.bestrelpath(loc),
|
|
fixturedef.argname, fixturedef))
|
|
|
|
available.sort()
|
|
currentmodule = None
|
|
for baseid, module, bestrel, argname, fixturedef in available:
|
|
if currentmodule != module:
|
|
if not module.startswith("_pytest."):
|
|
tw.line()
|
|
tw.sep("-", "fixtures defined from %s" %(module,))
|
|
currentmodule = module
|
|
if verbose <= 0 and argname[0] == "_":
|
|
continue
|
|
if verbose > 0:
|
|
funcargspec = "%s -- %s" %(argname, bestrel,)
|
|
else:
|
|
funcargspec = argname
|
|
tw.line(funcargspec, green=True)
|
|
loc = getlocation(fixturedef.func, curdir)
|
|
doc = fixturedef.func.__doc__ or ""
|
|
if doc:
|
|
for line in doc.strip().split("\n"):
|
|
tw.line(" " + line.strip())
|
|
else:
|
|
tw.line(" %s: no docstring available" %(loc,),
|
|
red=True)
|
|
|
|
|
|
# builtin pytest.raises helper
|
|
|
|
def raises(expected_exception, *args, **kwargs):
|
|
"""
|
|
Assert that a code block/function call raises ``expected_exception``
|
|
and raise a failure exception otherwise.
|
|
|
|
This helper produces a ``ExceptionInfo()`` object (see below).
|
|
|
|
If using Python 2.5 or above, you may use this function as a
|
|
context manager::
|
|
|
|
>>> with raises(ZeroDivisionError):
|
|
... 1/0
|
|
|
|
.. versionchanged:: 2.10
|
|
|
|
In the context manager form you may use the keyword argument
|
|
``message`` to specify a custom failure message::
|
|
|
|
>>> with raises(ZeroDivisionError, message="Expecting ZeroDivisionError"):
|
|
... pass
|
|
Traceback (most recent call last):
|
|
...
|
|
Failed: Expecting ZeroDivisionError
|
|
|
|
|
|
.. note::
|
|
|
|
When using ``pytest.raises`` as a context manager, it's worthwhile to
|
|
note that normal context manager rules apply and that the exception
|
|
raised *must* be the final line in the scope of the context manager.
|
|
Lines of code after that, within the scope of the context manager will
|
|
not be executed. For example::
|
|
|
|
>>> value = 15
|
|
>>> with raises(ValueError) as exc_info:
|
|
... if value > 10:
|
|
... raise ValueError("value must be <= 10")
|
|
... assert exc_info.type == ValueError # this will not execute
|
|
|
|
Instead, the following approach must be taken (note the difference in
|
|
scope)::
|
|
|
|
>>> with raises(ValueError) as exc_info:
|
|
... if value > 10:
|
|
... raise ValueError("value must be <= 10")
|
|
...
|
|
>>> assert exc_info.type == ValueError
|
|
|
|
Or you can use the keyword argument ``match`` to assert that the
|
|
exception matches a text or regex::
|
|
|
|
>>> with raises(ValueError, match='must be 0 or None'):
|
|
... raise ValueError("value must be 0 or None")
|
|
|
|
>>> with raises(ValueError, match=r'must be \d+$'):
|
|
... raise ValueError("value must be 42")
|
|
|
|
|
|
Or you can specify a callable by passing a to-be-called lambda::
|
|
|
|
>>> raises(ZeroDivisionError, lambda: 1/0)
|
|
<ExceptionInfo ...>
|
|
|
|
or you can specify an arbitrary callable with arguments::
|
|
|
|
>>> def f(x): return 1/x
|
|
...
|
|
>>> raises(ZeroDivisionError, f, 0)
|
|
<ExceptionInfo ...>
|
|
>>> raises(ZeroDivisionError, f, x=0)
|
|
<ExceptionInfo ...>
|
|
|
|
A third possibility is to use a string to be executed::
|
|
|
|
>>> raises(ZeroDivisionError, "f(0)")
|
|
<ExceptionInfo ...>
|
|
|
|
.. autoclass:: _pytest._code.ExceptionInfo
|
|
:members:
|
|
|
|
.. note::
|
|
Similar to caught exception objects in Python, explicitly clearing
|
|
local references to returned ``ExceptionInfo`` objects can
|
|
help the Python interpreter speed up its garbage collection.
|
|
|
|
Clearing those references breaks a reference cycle
|
|
(``ExceptionInfo`` --> caught exception --> frame stack raising
|
|
the exception --> current frame stack --> local variables -->
|
|
``ExceptionInfo``) which makes Python keep all objects referenced
|
|
from that cycle (including all local variables in the current
|
|
frame) alive until the next cyclic garbage collection run. See the
|
|
official Python ``try`` statement documentation for more detailed
|
|
information.
|
|
|
|
"""
|
|
__tracebackhide__ = True
|
|
msg = ("exceptions must be old-style classes or"
|
|
" derived from BaseException, not %s")
|
|
if isinstance(expected_exception, tuple):
|
|
for exc in expected_exception:
|
|
if not isclass(exc):
|
|
raise TypeError(msg % type(exc))
|
|
elif not isclass(expected_exception):
|
|
raise TypeError(msg % type(expected_exception))
|
|
|
|
message = "DID NOT RAISE {0}".format(expected_exception)
|
|
match_expr = None
|
|
|
|
if not args:
|
|
if "message" in kwargs:
|
|
message = kwargs.pop("message")
|
|
if "match" in kwargs:
|
|
match_expr = kwargs.pop("match")
|
|
message += " matching '{0}'".format(match_expr)
|
|
return RaisesContext(expected_exception, message, match_expr)
|
|
elif isinstance(args[0], str):
|
|
code, = args
|
|
assert isinstance(code, str)
|
|
frame = sys._getframe(1)
|
|
loc = frame.f_locals.copy()
|
|
loc.update(kwargs)
|
|
#print "raises frame scope: %r" % frame.f_locals
|
|
try:
|
|
code = _pytest._code.Source(code).compile()
|
|
py.builtin.exec_(code, frame.f_globals, loc)
|
|
# XXX didn'T mean f_globals == f_locals something special?
|
|
# this is destroyed here ...
|
|
except expected_exception:
|
|
return _pytest._code.ExceptionInfo()
|
|
else:
|
|
func = args[0]
|
|
try:
|
|
func(*args[1:], **kwargs)
|
|
except expected_exception:
|
|
return _pytest._code.ExceptionInfo()
|
|
pytest.fail(message)
|
|
|
|
class RaisesContext(object):
|
|
def __init__(self, expected_exception, message, match_expr):
|
|
self.expected_exception = expected_exception
|
|
self.message = message
|
|
self.match_expr = match_expr
|
|
self.excinfo = None
|
|
|
|
def __enter__(self):
|
|
self.excinfo = object.__new__(_pytest._code.ExceptionInfo)
|
|
return self.excinfo
|
|
|
|
def __exit__(self, *tp):
|
|
__tracebackhide__ = True
|
|
if tp[0] is None:
|
|
pytest.fail(self.message)
|
|
if sys.version_info < (2, 7):
|
|
# py26: on __exit__() exc_value often does not contain the
|
|
# exception value.
|
|
# http://bugs.python.org/issue7853
|
|
if not isinstance(tp[1], BaseException):
|
|
exc_type, value, traceback = tp
|
|
tp = exc_type, exc_type(value), traceback
|
|
self.excinfo.__init__(tp)
|
|
suppress_exception = issubclass(self.excinfo.type, self.expected_exception)
|
|
if sys.version_info[0] == 2 and suppress_exception:
|
|
sys.exc_clear()
|
|
if self.match_expr:
|
|
self.excinfo.match(self.match_expr)
|
|
return suppress_exception
|
|
|
|
|
|
# builtin pytest.approx helper
|
|
|
|
class approx(object):
|
|
"""
|
|
Assert that two numbers (or two sets of numbers) are equal to each other
|
|
within some tolerance.
|
|
|
|
Due to the `intricacies of floating-point arithmetic`__, numbers that we
|
|
would intuitively expect to be equal are not always so::
|
|
|
|
>>> 0.1 + 0.2 == 0.3
|
|
False
|
|
|
|
__ https://docs.python.org/3/tutorial/floatingpoint.html
|
|
|
|
This problem is commonly encountered when writing tests, e.g. when making
|
|
sure that floating-point values are what you expect them to be. One way to
|
|
deal with this problem is to assert that two floating-point numbers are
|
|
equal to within some appropriate tolerance::
|
|
|
|
>>> abs((0.1 + 0.2) - 0.3) < 1e-6
|
|
True
|
|
|
|
However, comparisons like this are tedious to write and difficult to
|
|
understand. Furthermore, absolute comparisons like the one above are
|
|
usually discouraged because there's no tolerance that works well for all
|
|
situations. ``1e-6`` is good for numbers around ``1``, but too small for
|
|
very big numbers and too big for very small ones. It's better to express
|
|
the tolerance as a fraction of the expected value, but relative comparisons
|
|
like that are even more difficult to write correctly and concisely.
|
|
|
|
The ``approx`` class performs floating-point comparisons using a syntax
|
|
that's as intuitive as possible::
|
|
|
|
>>> from pytest import approx
|
|
>>> 0.1 + 0.2 == approx(0.3)
|
|
True
|
|
|
|
The same syntax also works on sequences of numbers::
|
|
|
|
>>> (0.1 + 0.2, 0.2 + 0.4) == approx((0.3, 0.6))
|
|
True
|
|
|
|
By default, ``approx`` considers numbers within a relative tolerance of
|
|
``1e-6`` (i.e. one part in a million) of its expected value to be equal.
|
|
This treatment would lead to surprising results if the expected value was
|
|
``0.0``, because nothing but ``0.0`` itself is relatively close to ``0.0``.
|
|
To handle this case less surprisingly, ``approx`` also considers numbers
|
|
within an absolute tolerance of ``1e-12`` of its expected value to be
|
|
equal. Infinite numbers are another special case. They are only
|
|
considered equal to themselves, regardless of the relative tolerance. Both
|
|
the relative and absolute tolerances can be changed by passing arguments to
|
|
the ``approx`` constructor::
|
|
|
|
>>> 1.0001 == approx(1)
|
|
False
|
|
>>> 1.0001 == approx(1, rel=1e-3)
|
|
True
|
|
>>> 1.0001 == approx(1, abs=1e-3)
|
|
True
|
|
|
|
If you specify ``abs`` but not ``rel``, the comparison will not consider
|
|
the relative tolerance at all. In other words, two numbers that are within
|
|
the default relative tolerance of ``1e-6`` will still be considered unequal
|
|
if they exceed the specified absolute tolerance. If you specify both
|
|
``abs`` and ``rel``, the numbers will be considered equal if either
|
|
tolerance is met::
|
|
|
|
>>> 1 + 1e-8 == approx(1)
|
|
True
|
|
>>> 1 + 1e-8 == approx(1, abs=1e-12)
|
|
False
|
|
>>> 1 + 1e-8 == approx(1, rel=1e-6, abs=1e-12)
|
|
True
|
|
|
|
If you're thinking about using ``approx``, then you might want to know how
|
|
it compares to other good ways of comparing floating-point numbers. All of
|
|
these algorithms are based on relative and absolute tolerances and should
|
|
agree for the most part, but they do have meaningful differences:
|
|
|
|
- ``math.isclose(a, b, rel_tol=1e-9, abs_tol=0.0)``: True if the relative
|
|
tolerance is met w.r.t. either ``a`` or ``b`` or if the absolute
|
|
tolerance is met. Because the relative tolerance is calculated w.r.t.
|
|
both ``a`` and ``b``, this test is symmetric (i.e. neither ``a`` nor
|
|
``b`` is a "reference value"). You have to specify an absolute tolerance
|
|
if you want to compare to ``0.0`` because there is no tolerance by
|
|
default. Only available in python>=3.5. `More information...`__
|
|
|
|
__ https://docs.python.org/3/library/math.html#math.isclose
|
|
|
|
- ``numpy.isclose(a, b, rtol=1e-5, atol=1e-8)``: True if the difference
|
|
between ``a`` and ``b`` is less that the sum of the relative tolerance
|
|
w.r.t. ``b`` and the absolute tolerance. Because the relative tolerance
|
|
is only calculated w.r.t. ``b``, this test is asymmetric and you can
|
|
think of ``b`` as the reference value. Support for comparing sequences
|
|
is provided by ``numpy.allclose``. `More information...`__
|
|
|
|
__ http://docs.scipy.org/doc/numpy-1.10.0/reference/generated/numpy.isclose.html
|
|
|
|
- ``unittest.TestCase.assertAlmostEqual(a, b)``: True if ``a`` and ``b``
|
|
are within an absolute tolerance of ``1e-7``. No relative tolerance is
|
|
considered and the absolute tolerance cannot be changed, so this function
|
|
is not appropriate for very large or very small numbers. Also, it's only
|
|
available in subclasses of ``unittest.TestCase`` and it's ugly because it
|
|
doesn't follow PEP8. `More information...`__
|
|
|
|
__ https://docs.python.org/3/library/unittest.html#unittest.TestCase.assertAlmostEqual
|
|
|
|
- ``a == pytest.approx(b, rel=1e-6, abs=1e-12)``: True if the relative
|
|
tolerance is met w.r.t. ``b`` or if the absolute tolerance is met.
|
|
Because the relative tolerance is only calculated w.r.t. ``b``, this test
|
|
is asymmetric and you can think of ``b`` as the reference value. In the
|
|
special case that you explicitly specify an absolute tolerance but not a
|
|
relative tolerance, only the absolute tolerance is considered.
|
|
"""
|
|
|
|
def __init__(self, expected, rel=None, abs=None):
|
|
self.expected = expected
|
|
self.abs = abs
|
|
self.rel = rel
|
|
|
|
def __repr__(self):
|
|
return ', '.join(repr(x) for x in self.expected)
|
|
|
|
def __eq__(self, actual):
|
|
from collections import Iterable
|
|
if not isinstance(actual, Iterable):
|
|
actual = [actual]
|
|
if len(actual) != len(self.expected):
|
|
return False
|
|
return all(a == x for a, x in zip(actual, self.expected))
|
|
|
|
__hash__ = None
|
|
|
|
def __ne__(self, actual):
|
|
return not (actual == self)
|
|
|
|
@property
|
|
def expected(self):
|
|
# Regardless of whether the user-specified expected value is a number
|
|
# or a sequence of numbers, return a list of ApproxNotIterable objects
|
|
# that can be compared against.
|
|
from collections import Iterable
|
|
approx_non_iter = lambda x: ApproxNonIterable(x, self.rel, self.abs)
|
|
if isinstance(self._expected, Iterable):
|
|
return [approx_non_iter(x) for x in self._expected]
|
|
else:
|
|
return [approx_non_iter(self._expected)]
|
|
|
|
@expected.setter
|
|
def expected(self, expected):
|
|
self._expected = expected
|
|
|
|
|
|
class ApproxNonIterable(object):
|
|
"""
|
|
Perform approximate comparisons for single numbers only.
|
|
|
|
In other words, the ``expected`` attribute for objects of this class must
|
|
be some sort of number. This is in contrast to the ``approx`` class, where
|
|
the ``expected`` attribute can either be a number of a sequence of numbers.
|
|
This class is responsible for making comparisons, while ``approx`` is
|
|
responsible for abstracting the difference between numbers and sequences of
|
|
numbers. Although this class can stand on its own, it's only meant to be
|
|
used within ``approx``.
|
|
"""
|
|
|
|
def __init__(self, expected, rel=None, abs=None):
|
|
self.expected = expected
|
|
self.abs = abs
|
|
self.rel = rel
|
|
|
|
def __repr__(self):
|
|
if isinstance(self.expected, complex):
|
|
return str(self.expected)
|
|
|
|
# Infinities aren't compared using tolerances, so don't show a
|
|
# tolerance.
|
|
if math.isinf(self.expected):
|
|
return str(self.expected)
|
|
|
|
# If a sensible tolerance can't be calculated, self.tolerance will
|
|
# raise a ValueError. In this case, display '???'.
|
|
try:
|
|
vetted_tolerance = '{:.1e}'.format(self.tolerance)
|
|
except ValueError:
|
|
vetted_tolerance = '???'
|
|
|
|
if sys.version_info[0] == 2:
|
|
return '{0} +- {1}'.format(self.expected, vetted_tolerance)
|
|
else:
|
|
return u'{0} \u00b1 {1}'.format(self.expected, vetted_tolerance)
|
|
|
|
def __eq__(self, actual):
|
|
# Short-circuit exact equality.
|
|
if actual == self.expected:
|
|
return True
|
|
|
|
# Infinity shouldn't be approximately equal to anything but itself, but
|
|
# if there's a relative tolerance, it will be infinite and infinity
|
|
# will seem approximately equal to everything. The equal-to-itself
|
|
# case would have been short circuited above, so here we can just
|
|
# return false if the expected value is infinite. The abs() call is
|
|
# for compatibility with complex numbers.
|
|
if math.isinf(abs(self.expected)):
|
|
return False
|
|
|
|
# Return true if the two numbers are within the tolerance.
|
|
return abs(self.expected - actual) <= self.tolerance
|
|
|
|
__hash__ = None
|
|
|
|
def __ne__(self, actual):
|
|
return not (actual == self)
|
|
|
|
@property
|
|
def tolerance(self):
|
|
set_default = lambda x, default: x if x is not None else default
|
|
|
|
# Figure out what the absolute tolerance should be. ``self.abs`` is
|
|
# either None or a value specified by the user.
|
|
absolute_tolerance = set_default(self.abs, 1e-12)
|
|
|
|
if absolute_tolerance < 0:
|
|
raise ValueError("absolute tolerance can't be negative: {}".format(absolute_tolerance))
|
|
if math.isnan(absolute_tolerance):
|
|
raise ValueError("absolute tolerance can't be NaN.")
|
|
|
|
# If the user specified an absolute tolerance but not a relative one,
|
|
# just return the absolute tolerance.
|
|
if self.rel is None:
|
|
if self.abs is not None:
|
|
return absolute_tolerance
|
|
|
|
# Figure out what the relative tolerance should be. ``self.rel`` is
|
|
# either None or a value specified by the user. This is done after
|
|
# we've made sure the user didn't ask for an absolute tolerance only,
|
|
# because we don't want to raise errors about the relative tolerance if
|
|
# we aren't even going to use it.
|
|
relative_tolerance = set_default(self.rel, 1e-6) * abs(self.expected)
|
|
|
|
if relative_tolerance < 0:
|
|
raise ValueError("relative tolerance can't be negative: {}".format(absolute_tolerance))
|
|
if math.isnan(relative_tolerance):
|
|
raise ValueError("relative tolerance can't be NaN.")
|
|
|
|
# Return the larger of the relative and absolute tolerances.
|
|
return max(relative_tolerance, absolute_tolerance)
|
|
|
|
|
|
#
|
|
# the basic pytest Function item
|
|
#
|
|
|
|
class Function(FunctionMixin, pytest.Item, fixtures.FuncargnamesCompatAttr):
|
|
""" a Function Item is responsible for setting up and executing a
|
|
Python test function.
|
|
"""
|
|
_genid = None
|
|
def __init__(self, name, parent, args=None, config=None,
|
|
callspec=None, callobj=NOTSET, keywords=None, session=None,
|
|
fixtureinfo=None, originalname=None):
|
|
super(Function, self).__init__(name, parent, config=config,
|
|
session=session)
|
|
self._args = args
|
|
if callobj is not NOTSET:
|
|
self.obj = callobj
|
|
|
|
self.keywords.update(self.obj.__dict__)
|
|
if callspec:
|
|
self.callspec = callspec
|
|
self.keywords.update(callspec.keywords)
|
|
if keywords:
|
|
self.keywords.update(keywords)
|
|
|
|
if fixtureinfo is None:
|
|
fixtureinfo = self.session._fixturemanager.getfixtureinfo(
|
|
self.parent, self.obj, self.cls,
|
|
funcargs=not self._isyieldedfunction())
|
|
self._fixtureinfo = fixtureinfo
|
|
self.fixturenames = fixtureinfo.names_closure
|
|
self._initrequest()
|
|
|
|
#: original function name, without any decorations (for example
|
|
#: parametrization adds a ``"[...]"`` suffix to function names).
|
|
#:
|
|
#: .. versionadded:: 3.0
|
|
self.originalname = originalname
|
|
|
|
def _initrequest(self):
|
|
self.funcargs = {}
|
|
if self._isyieldedfunction():
|
|
assert not hasattr(self, "callspec"), (
|
|
"yielded functions (deprecated) cannot have funcargs")
|
|
else:
|
|
if hasattr(self, "callspec"):
|
|
callspec = self.callspec
|
|
assert not callspec.funcargs
|
|
self._genid = callspec.id
|
|
if hasattr(callspec, "param"):
|
|
self.param = callspec.param
|
|
self._request = fixtures.FixtureRequest(self)
|
|
|
|
@property
|
|
def function(self):
|
|
"underlying python 'function' object"
|
|
return getattr(self.obj, 'im_func', self.obj)
|
|
|
|
def _getobj(self):
|
|
name = self.name
|
|
i = name.find("[") # parametrization
|
|
if i != -1:
|
|
name = name[:i]
|
|
return getattr(self.parent.obj, name)
|
|
|
|
@property
|
|
def _pyfuncitem(self):
|
|
"(compatonly) for code expecting pytest-2.2 style request objects"
|
|
return self
|
|
|
|
def _isyieldedfunction(self):
|
|
return getattr(self, "_args", None) is not None
|
|
|
|
def runtest(self):
|
|
""" execute the underlying test function. """
|
|
self.ihook.pytest_pyfunc_call(pyfuncitem=self)
|
|
|
|
def setup(self):
|
|
super(Function, self).setup()
|
|
fixtures.fillfixtures(self)
|