Files
pytest2/testing/code/test_excinfo.py
Ran Benita 307add025b Simplify a FormattedExcinfo test
The previous test was better in that it used fakes to test all of the
real code paths. The problem with that is that it makes it impossible to
simplify the code with `isinstance` checks. So let's just simulate the
issue directly with a monkeypatch.
2019-11-16 17:22:09 +02:00

1365 lines
44 KiB
Python

import operator
import os
import queue
import sys
import textwrap
import py
import _pytest
import pytest
from _pytest._code.code import ExceptionChainRepr
from _pytest._code.code import ExceptionInfo
from _pytest._code.code import FormattedExcinfo
try:
import importlib
except ImportError:
invalidate_import_caches = None
else:
invalidate_import_caches = getattr(importlib, "invalidate_caches", None)
pytest_version_info = tuple(map(int, pytest.__version__.split(".")[:3]))
@pytest.fixture
def limited_recursion_depth():
before = sys.getrecursionlimit()
sys.setrecursionlimit(150)
yield
sys.setrecursionlimit(before)
def test_excinfo_simple() -> None:
try:
raise ValueError
except ValueError:
info = _pytest._code.ExceptionInfo.from_current()
assert info.type == ValueError
def test_excinfo_from_exc_info_simple():
try:
raise ValueError
except ValueError as e:
info = _pytest._code.ExceptionInfo.from_exc_info((type(e), e, e.__traceback__))
assert info.type == ValueError
def test_excinfo_getstatement():
def g():
raise ValueError
def f():
g()
try:
f()
except ValueError:
excinfo = _pytest._code.ExceptionInfo.from_current()
linenumbers = [
f.__code__.co_firstlineno - 1 + 4,
f.__code__.co_firstlineno - 1 + 1,
g.__code__.co_firstlineno - 1 + 1,
]
values = list(excinfo.traceback)
foundlinenumbers = [x.lineno for x in values]
assert foundlinenumbers == linenumbers
# for x in info:
# print "%s:%d %s" %(x.path.relto(root), x.lineno, x.statement)
# xxx
# testchain for getentries test below
def f():
#
raise ValueError
#
def g():
#
__tracebackhide__ = True
f()
#
def h():
#
g()
#
class TestTraceback_f_g_h:
def setup_method(self, method):
try:
h()
except ValueError:
self.excinfo = _pytest._code.ExceptionInfo.from_current()
def test_traceback_entries(self):
tb = self.excinfo.traceback
entries = list(tb)
assert len(tb) == 4 # maybe fragile test
assert len(entries) == 4 # maybe fragile test
names = ["f", "g", "h"]
for entry in entries:
try:
names.remove(entry.frame.code.name)
except ValueError:
pass
assert not names
def test_traceback_entry_getsource(self):
tb = self.excinfo.traceback
s = str(tb[-1].getsource())
assert s.startswith("def f():")
assert s.endswith("raise ValueError")
def test_traceback_entry_getsource_in_construct(self):
source = _pytest._code.Source(
"""\
def xyz():
try:
raise ValueError
except somenoname:
pass
xyz()
"""
)
try:
exec(source.compile())
except NameError:
tb = _pytest._code.ExceptionInfo.from_current().traceback
print(tb[-1].getsource())
s = str(tb[-1].getsource())
assert s.startswith("def xyz():\n try:")
assert s.strip().endswith("except somenoname:")
def test_traceback_cut(self):
co = _pytest._code.Code(f)
path, firstlineno = co.path, co.firstlineno
traceback = self.excinfo.traceback
newtraceback = traceback.cut(path=path, firstlineno=firstlineno)
assert len(newtraceback) == 1
newtraceback = traceback.cut(path=path, lineno=firstlineno + 2)
assert len(newtraceback) == 1
def test_traceback_cut_excludepath(self, testdir):
p = testdir.makepyfile("def f(): raise ValueError")
with pytest.raises(ValueError) as excinfo:
p.pyimport().f()
basedir = py.path.local(pytest.__file__).dirpath()
newtraceback = excinfo.traceback.cut(excludepath=basedir)
for x in newtraceback:
if hasattr(x, "path"):
assert not py.path.local(x.path).relto(basedir)
assert newtraceback[-1].frame.code.path == p
def test_traceback_filter(self):
traceback = self.excinfo.traceback
ntraceback = traceback.filter()
assert len(ntraceback) == len(traceback) - 1
@pytest.mark.parametrize(
"tracebackhide, matching",
[
(lambda info: True, True),
(lambda info: False, False),
(operator.methodcaller("errisinstance", ValueError), True),
(operator.methodcaller("errisinstance", IndexError), False),
],
)
def test_traceback_filter_selective(self, tracebackhide, matching):
def f():
#
raise ValueError
#
def g():
#
__tracebackhide__ = tracebackhide
f()
#
def h():
#
g()
#
excinfo = pytest.raises(ValueError, h)
traceback = excinfo.traceback
ntraceback = traceback.filter()
print("old: {!r}".format(traceback))
print("new: {!r}".format(ntraceback))
if matching:
assert len(ntraceback) == len(traceback) - 2
else:
# -1 because of the __tracebackhide__ in pytest.raises
assert len(ntraceback) == len(traceback) - 1
def test_traceback_recursion_index(self):
def f(n):
if n < 10:
n += 1
f(n)
excinfo = pytest.raises(RuntimeError, f, 8)
traceback = excinfo.traceback
recindex = traceback.recursionindex()
assert recindex == 3
def test_traceback_only_specific_recursion_errors(self, monkeypatch):
def f(n):
if n == 0:
raise RuntimeError("hello")
f(n - 1)
excinfo = pytest.raises(RuntimeError, f, 25)
monkeypatch.delattr(excinfo.traceback.__class__, "recursionindex")
repr = excinfo.getrepr()
assert "RuntimeError: hello" in str(repr.reprcrash)
def test_traceback_no_recursion_index(self):
def do_stuff():
raise RuntimeError
def reraise_me():
import sys
exc, val, tb = sys.exc_info()
raise val.with_traceback(tb)
def f(n):
try:
do_stuff()
except: # noqa
reraise_me()
excinfo = pytest.raises(RuntimeError, f, 8)
traceback = excinfo.traceback
recindex = traceback.recursionindex()
assert recindex is None
def test_traceback_messy_recursion(self):
# XXX: simplified locally testable version
decorator = pytest.importorskip("decorator").decorator
def log(f, *k, **kw):
print("{} {}".format(k, kw))
f(*k, **kw)
log = decorator(log)
def fail():
raise ValueError("")
fail = log(log(fail))
excinfo = pytest.raises(ValueError, fail)
assert excinfo.traceback.recursionindex() is None
def test_traceback_getcrashentry(self):
def i():
__tracebackhide__ = True
raise ValueError
def h():
i()
def g():
__tracebackhide__ = True
h()
def f():
g()
excinfo = pytest.raises(ValueError, f)
tb = excinfo.traceback
entry = tb.getcrashentry()
co = _pytest._code.Code(h)
assert entry.frame.code.path == co.path
assert entry.lineno == co.firstlineno + 1
assert entry.frame.code.name == "h"
def test_traceback_getcrashentry_empty(self):
def g():
__tracebackhide__ = True
raise ValueError
def f():
__tracebackhide__ = True
g()
excinfo = pytest.raises(ValueError, f)
tb = excinfo.traceback
entry = tb.getcrashentry()
co = _pytest._code.Code(g)
assert entry.frame.code.path == co.path
assert entry.lineno == co.firstlineno + 2
assert entry.frame.code.name == "g"
def test_excinfo_exconly():
excinfo = pytest.raises(ValueError, h)
assert excinfo.exconly().startswith("ValueError")
with pytest.raises(ValueError) as excinfo:
raise ValueError("hello\nworld")
msg = excinfo.exconly(tryshort=True)
assert msg.startswith("ValueError")
assert msg.endswith("world")
def test_excinfo_repr_str():
excinfo = pytest.raises(ValueError, h)
assert repr(excinfo) == "<ExceptionInfo ValueError() tblen=4>"
assert str(excinfo) == "<ExceptionInfo ValueError() tblen=4>"
class CustomException(Exception):
def __repr__(self):
return "custom_repr"
def raises():
raise CustomException()
excinfo = pytest.raises(CustomException, raises)
assert repr(excinfo) == "<ExceptionInfo custom_repr tblen=2>"
assert str(excinfo) == "<ExceptionInfo custom_repr tblen=2>"
def test_excinfo_for_later():
e = ExceptionInfo.for_later()
assert "for raises" in repr(e)
assert "for raises" in str(e)
def test_excinfo_errisinstance():
excinfo = pytest.raises(ValueError, h)
assert excinfo.errisinstance(ValueError)
def test_excinfo_no_sourcecode():
try:
exec("raise ValueError()")
except ValueError:
excinfo = _pytest._code.ExceptionInfo.from_current()
s = str(excinfo.traceback[-1])
assert s == " File '<string>':1 in <module>\n ???\n"
def test_excinfo_no_python_sourcecode(tmpdir):
# XXX: simplified locally testable version
tmpdir.join("test.txt").write("{{ h()}}:")
jinja2 = pytest.importorskip("jinja2")
loader = jinja2.FileSystemLoader(str(tmpdir))
env = jinja2.Environment(loader=loader)
template = env.get_template("test.txt")
excinfo = pytest.raises(ValueError, template.render, h=h)
for item in excinfo.traceback:
print(item) # XXX: for some reason jinja.Template.render is printed in full
item.source # shouldn't fail
if item.path.basename == "test.txt":
assert str(item.source) == "{{ h()}}:"
def test_entrysource_Queue_example():
try:
queue.Queue().get(timeout=0.001)
except queue.Empty:
excinfo = _pytest._code.ExceptionInfo.from_current()
entry = excinfo.traceback[-1]
source = entry.getsource()
assert source is not None
s = str(source).strip()
assert s.startswith("def get")
def test_codepath_Queue_example():
try:
queue.Queue().get(timeout=0.001)
except queue.Empty:
excinfo = _pytest._code.ExceptionInfo.from_current()
entry = excinfo.traceback[-1]
path = entry.path
assert isinstance(path, py.path.local)
assert path.basename.lower() == "queue.py"
assert path.check()
def test_match_succeeds():
with pytest.raises(ZeroDivisionError) as excinfo:
0 // 0
excinfo.match(r".*zero.*")
def test_match_raises_error(testdir):
testdir.makepyfile(
"""
import pytest
def test_division_zero():
with pytest.raises(ZeroDivisionError) as excinfo:
0 / 0
excinfo.match(r'[123]+')
"""
)
result = testdir.runpytest()
assert result.ret != 0
result.stdout.fnmatch_lines(["*AssertionError*Pattern*[123]*not found*"])
result.stdout.no_fnmatch_line("*__tracebackhide__ = True*")
result = testdir.runpytest("--fulltrace")
assert result.ret != 0
result.stdout.fnmatch_lines(
["*__tracebackhide__ = True*", "*AssertionError*Pattern*[123]*not found*"]
)
class TestFormattedExcinfo:
@pytest.fixture
def importasmod(self, request, _sys_snapshot):
def importasmod(source):
source = textwrap.dedent(source)
tmpdir = request.getfixturevalue("tmpdir")
modpath = tmpdir.join("mod.py")
tmpdir.ensure("__init__.py")
modpath.write(source)
if invalidate_import_caches is not None:
invalidate_import_caches()
return modpath.pyimport()
return importasmod
def excinfo_from_exec(self, source):
source = _pytest._code.Source(source).strip()
try:
exec(source.compile())
except KeyboardInterrupt:
raise
except: # noqa
return _pytest._code.ExceptionInfo.from_current()
assert 0, "did not raise"
def test_repr_source(self):
pr = FormattedExcinfo()
source = _pytest._code.Source(
"""\
def f(x):
pass
"""
).strip()
pr.flow_marker = "|"
lines = pr.get_source(source, 0)
assert len(lines) == 2
assert lines[0] == "| def f(x):"
assert lines[1] == " pass"
def test_repr_source_excinfo(self):
""" check if indentation is right """
pr = FormattedExcinfo()
excinfo = self.excinfo_from_exec(
"""
def f():
assert 0
f()
"""
)
pr = FormattedExcinfo()
source = pr._getentrysource(excinfo.traceback[-1])
lines = pr.get_source(source, 1, excinfo)
assert lines == [" def f():", "> assert 0", "E AssertionError"]
def test_repr_source_not_existing(self):
pr = FormattedExcinfo()
co = compile("raise ValueError()", "", "exec")
try:
exec(co)
except ValueError:
excinfo = _pytest._code.ExceptionInfo.from_current()
repr = pr.repr_excinfo(excinfo)
assert repr.reprtraceback.reprentries[1].lines[0] == "> ???"
assert repr.chain[0][0].reprentries[1].lines[0] == "> ???"
def test_repr_many_line_source_not_existing(self):
pr = FormattedExcinfo()
co = compile(
"""
a = 1
raise ValueError()
""",
"",
"exec",
)
try:
exec(co)
except ValueError:
excinfo = _pytest._code.ExceptionInfo.from_current()
repr = pr.repr_excinfo(excinfo)
assert repr.reprtraceback.reprentries[1].lines[0] == "> ???"
assert repr.chain[0][0].reprentries[1].lines[0] == "> ???"
def test_repr_source_failing_fullsource(self, monkeypatch) -> None:
pr = FormattedExcinfo()
try:
1 / 0
except ZeroDivisionError:
excinfo = ExceptionInfo.from_current()
with monkeypatch.context() as m:
m.setattr(_pytest._code.Code, "fullsource", property(lambda self: None))
repr = pr.repr_excinfo(excinfo)
assert repr.reprtraceback.reprentries[0].lines[0] == "> ???"
assert repr.chain[0][0].reprentries[0].lines[0] == "> ???"
def test_repr_local(self):
p = FormattedExcinfo(showlocals=True)
loc = {"y": 5, "z": 7, "x": 3, "@x": 2, "__builtins__": {}}
reprlocals = p.repr_locals(loc)
assert reprlocals.lines
assert reprlocals.lines[0] == "__builtins__ = <builtins>"
assert reprlocals.lines[1] == "x = 3"
assert reprlocals.lines[2] == "y = 5"
assert reprlocals.lines[3] == "z = 7"
def test_repr_local_with_error(self):
class ObjWithErrorInRepr:
def __repr__(self):
raise NotImplementedError
p = FormattedExcinfo(showlocals=True, truncate_locals=False)
loc = {"x": ObjWithErrorInRepr(), "__builtins__": {}}
reprlocals = p.repr_locals(loc)
assert reprlocals.lines
assert reprlocals.lines[0] == "__builtins__ = <builtins>"
assert "[NotImplementedError() raised in repr()]" in reprlocals.lines[1]
def test_repr_local_with_exception_in_class_property(self):
class ExceptionWithBrokenClass(Exception):
# Type ignored because it's bypassed intentionally.
@property # type: ignore
def __class__(self):
raise TypeError("boom!")
class ObjWithErrorInRepr:
def __repr__(self):
raise ExceptionWithBrokenClass()
p = FormattedExcinfo(showlocals=True, truncate_locals=False)
loc = {"x": ObjWithErrorInRepr(), "__builtins__": {}}
reprlocals = p.repr_locals(loc)
assert reprlocals.lines
assert reprlocals.lines[0] == "__builtins__ = <builtins>"
assert "[ExceptionWithBrokenClass() raised in repr()]" in reprlocals.lines[1]
def test_repr_local_truncated(self):
loc = {"l": [i for i in range(10)]}
p = FormattedExcinfo(showlocals=True)
truncated_reprlocals = p.repr_locals(loc)
assert truncated_reprlocals.lines
assert truncated_reprlocals.lines[0] == "l = [0, 1, 2, 3, 4, 5, ...]"
q = FormattedExcinfo(showlocals=True, truncate_locals=False)
full_reprlocals = q.repr_locals(loc)
assert full_reprlocals.lines
assert full_reprlocals.lines[0] == "l = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]"
def test_repr_tracebackentry_lines(self, importasmod):
mod = importasmod(
"""
def func1():
raise ValueError("hello\\nworld")
"""
)
excinfo = pytest.raises(ValueError, mod.func1)
excinfo.traceback = excinfo.traceback.filter()
p = FormattedExcinfo()
reprtb = p.repr_traceback_entry(excinfo.traceback[-1])
# test as intermittent entry
lines = reprtb.lines
assert lines[0] == " def func1():"
assert lines[1] == '> raise ValueError("hello\\nworld")'
# test as last entry
p = FormattedExcinfo(showlocals=True)
repr_entry = p.repr_traceback_entry(excinfo.traceback[-1], excinfo)
lines = repr_entry.lines
assert lines[0] == " def func1():"
assert lines[1] == '> raise ValueError("hello\\nworld")'
assert lines[2] == "E ValueError: hello"
assert lines[3] == "E world"
assert not lines[4:]
loc = repr_entry.reprlocals is not None
loc = repr_entry.reprfileloc
assert loc.path == mod.__file__
assert loc.lineno == 3
# assert loc.message == "ValueError: hello"
def test_repr_tracebackentry_lines2(self, importasmod, tw_mock):
mod = importasmod(
"""
def func1(m, x, y, z):
raise ValueError("hello\\nworld")
"""
)
excinfo = pytest.raises(ValueError, mod.func1, "m" * 90, 5, 13, "z" * 120)
excinfo.traceback = excinfo.traceback.filter()
entry = excinfo.traceback[-1]
p = FormattedExcinfo(funcargs=True)
reprfuncargs = p.repr_args(entry)
assert reprfuncargs.args[0] == ("m", repr("m" * 90))
assert reprfuncargs.args[1] == ("x", "5")
assert reprfuncargs.args[2] == ("y", "13")
assert reprfuncargs.args[3] == ("z", repr("z" * 120))
p = FormattedExcinfo(funcargs=True)
repr_entry = p.repr_traceback_entry(entry)
assert repr_entry.reprfuncargs.args == reprfuncargs.args
repr_entry.toterminal(tw_mock)
assert tw_mock.lines[0] == "m = " + repr("m" * 90)
assert tw_mock.lines[1] == "x = 5, y = 13"
assert tw_mock.lines[2] == "z = " + repr("z" * 120)
def test_repr_tracebackentry_lines_var_kw_args(self, importasmod, tw_mock):
mod = importasmod(
"""
def func1(x, *y, **z):
raise ValueError("hello\\nworld")
"""
)
excinfo = pytest.raises(ValueError, mod.func1, "a", "b", c="d")
excinfo.traceback = excinfo.traceback.filter()
entry = excinfo.traceback[-1]
p = FormattedExcinfo(funcargs=True)
reprfuncargs = p.repr_args(entry)
assert reprfuncargs.args[0] == ("x", repr("a"))
assert reprfuncargs.args[1] == ("y", repr(("b",)))
assert reprfuncargs.args[2] == ("z", repr({"c": "d"}))
p = FormattedExcinfo(funcargs=True)
repr_entry = p.repr_traceback_entry(entry)
assert repr_entry.reprfuncargs.args == reprfuncargs.args
repr_entry.toterminal(tw_mock)
assert tw_mock.lines[0] == "x = 'a', y = ('b',), z = {'c': 'd'}"
def test_repr_tracebackentry_short(self, importasmod):
mod = importasmod(
"""
def func1():
raise ValueError("hello")
def entry():
func1()
"""
)
excinfo = pytest.raises(ValueError, mod.entry)
p = FormattedExcinfo(style="short")
reprtb = p.repr_traceback_entry(excinfo.traceback[-2])
lines = reprtb.lines
basename = py.path.local(mod.__file__).basename
assert lines[0] == " func1()"
assert basename in str(reprtb.reprfileloc.path)
assert reprtb.reprfileloc.lineno == 5
# test last entry
p = FormattedExcinfo(style="short")
reprtb = p.repr_traceback_entry(excinfo.traceback[-1], excinfo)
lines = reprtb.lines
assert lines[0] == ' raise ValueError("hello")'
assert lines[1] == "E ValueError: hello"
assert basename in str(reprtb.reprfileloc.path)
assert reprtb.reprfileloc.lineno == 3
def test_repr_tracebackentry_no(self, importasmod):
mod = importasmod(
"""
def func1():
raise ValueError("hello")
def entry():
func1()
"""
)
excinfo = pytest.raises(ValueError, mod.entry)
p = FormattedExcinfo(style="no")
p.repr_traceback_entry(excinfo.traceback[-2])
p = FormattedExcinfo(style="no")
reprentry = p.repr_traceback_entry(excinfo.traceback[-1], excinfo)
lines = reprentry.lines
assert lines[0] == "E ValueError: hello"
assert not lines[1:]
def test_repr_traceback_tbfilter(self, importasmod):
mod = importasmod(
"""
def f(x):
raise ValueError(x)
def entry():
f(0)
"""
)
excinfo = pytest.raises(ValueError, mod.entry)
p = FormattedExcinfo(tbfilter=True)
reprtb = p.repr_traceback(excinfo)
assert len(reprtb.reprentries) == 2
p = FormattedExcinfo(tbfilter=False)
reprtb = p.repr_traceback(excinfo)
assert len(reprtb.reprentries) == 3
def test_traceback_short_no_source(self, importasmod, monkeypatch):
mod = importasmod(
"""
def func1():
raise ValueError("hello")
def entry():
func1()
"""
)
excinfo = pytest.raises(ValueError, mod.entry)
from _pytest._code.code import Code
monkeypatch.setattr(Code, "path", "bogus")
excinfo.traceback[0].frame.code.path = "bogus"
p = FormattedExcinfo(style="short")
reprtb = p.repr_traceback_entry(excinfo.traceback[-2])
lines = reprtb.lines
last_p = FormattedExcinfo(style="short")
last_reprtb = last_p.repr_traceback_entry(excinfo.traceback[-1], excinfo)
last_lines = last_reprtb.lines
monkeypatch.undo()
assert lines[0] == " func1()"
assert last_lines[0] == ' raise ValueError("hello")'
assert last_lines[1] == "E ValueError: hello"
def test_repr_traceback_and_excinfo(self, importasmod):
mod = importasmod(
"""
def f(x):
raise ValueError(x)
def entry():
f(0)
"""
)
excinfo = pytest.raises(ValueError, mod.entry)
for style in ("long", "short"):
p = FormattedExcinfo(style=style)
reprtb = p.repr_traceback(excinfo)
assert len(reprtb.reprentries) == 2
assert reprtb.style == style
assert not reprtb.extraline
repr = p.repr_excinfo(excinfo)
assert repr.reprtraceback
assert len(repr.reprtraceback.reprentries) == len(reprtb.reprentries)
assert repr.chain[0][0]
assert len(repr.chain[0][0].reprentries) == len(reprtb.reprentries)
assert repr.reprcrash.path.endswith("mod.py")
assert repr.reprcrash.message == "ValueError: 0"
def test_repr_traceback_with_invalid_cwd(self, importasmod, monkeypatch):
mod = importasmod(
"""
def f(x):
raise ValueError(x)
def entry():
f(0)
"""
)
excinfo = pytest.raises(ValueError, mod.entry)
p = FormattedExcinfo()
def raiseos():
raise OSError(2)
monkeypatch.setattr(os, "getcwd", raiseos)
assert p._makepath(__file__) == __file__
p.repr_traceback(excinfo)
def test_repr_excinfo_addouterr(self, importasmod, tw_mock):
mod = importasmod(
"""
def entry():
raise ValueError()
"""
)
excinfo = pytest.raises(ValueError, mod.entry)
repr = excinfo.getrepr()
repr.addsection("title", "content")
repr.toterminal(tw_mock)
assert tw_mock.lines[-1] == "content"
assert tw_mock.lines[-2] == ("-", "title")
def test_repr_excinfo_reprcrash(self, importasmod):
mod = importasmod(
"""
def entry():
raise ValueError()
"""
)
excinfo = pytest.raises(ValueError, mod.entry)
repr = excinfo.getrepr()
assert repr.reprcrash.path.endswith("mod.py")
assert repr.reprcrash.lineno == 3
assert repr.reprcrash.message == "ValueError"
assert str(repr.reprcrash).endswith("mod.py:3: ValueError")
def test_repr_traceback_recursion(self, importasmod):
mod = importasmod(
"""
def rec2(x):
return rec1(x+1)
def rec1(x):
return rec2(x-1)
def entry():
rec1(42)
"""
)
excinfo = pytest.raises(RuntimeError, mod.entry)
for style in ("short", "long", "no"):
p = FormattedExcinfo(style="short")
reprtb = p.repr_traceback(excinfo)
assert reprtb.extraline == "!!! Recursion detected (same locals & position)"
assert str(reprtb)
def test_reprexcinfo_getrepr(self, importasmod):
mod = importasmod(
"""
def f(x):
raise ValueError(x)
def entry():
f(0)
"""
)
excinfo = pytest.raises(ValueError, mod.entry)
for style in ("short", "long", "no"):
for showlocals in (True, False):
repr = excinfo.getrepr(style=style, showlocals=showlocals)
assert repr.reprtraceback.style == style
assert isinstance(repr, ExceptionChainRepr)
for repr in repr.chain:
assert repr[0].style == style
def test_reprexcinfo_unicode(self):
from _pytest._code.code import TerminalRepr
class MyRepr(TerminalRepr):
def toterminal(self, tw) -> None:
tw.line("я")
x = str(MyRepr())
assert x == "я"
def test_toterminal_long(self, importasmod, tw_mock):
mod = importasmod(
"""
def g(x):
raise ValueError(x)
def f():
g(3)
"""
)
excinfo = pytest.raises(ValueError, mod.f)
excinfo.traceback = excinfo.traceback.filter()
repr = excinfo.getrepr()
repr.toterminal(tw_mock)
assert tw_mock.lines[0] == ""
tw_mock.lines.pop(0)
assert tw_mock.lines[0] == " def f():"
assert tw_mock.lines[1] == "> g(3)"
assert tw_mock.lines[2] == ""
line = tw_mock.get_write_msg(3)
assert line.endswith("mod.py")
assert tw_mock.lines[4] == (":5: ")
assert tw_mock.lines[5] == ("_ ", None)
assert tw_mock.lines[6] == ""
assert tw_mock.lines[7] == " def g(x):"
assert tw_mock.lines[8] == "> raise ValueError(x)"
assert tw_mock.lines[9] == "E ValueError: 3"
assert tw_mock.lines[10] == ""
line = tw_mock.get_write_msg(11)
assert line.endswith("mod.py")
assert tw_mock.lines[12] == ":3: ValueError"
def test_toterminal_long_missing_source(self, importasmod, tmpdir, tw_mock):
mod = importasmod(
"""
def g(x):
raise ValueError(x)
def f():
g(3)
"""
)
excinfo = pytest.raises(ValueError, mod.f)
tmpdir.join("mod.py").remove()
excinfo.traceback = excinfo.traceback.filter()
repr = excinfo.getrepr()
repr.toterminal(tw_mock)
assert tw_mock.lines[0] == ""
tw_mock.lines.pop(0)
assert tw_mock.lines[0] == "> ???"
assert tw_mock.lines[1] == ""
line = tw_mock.get_write_msg(2)
assert line.endswith("mod.py")
assert tw_mock.lines[3] == ":5: "
assert tw_mock.lines[4] == ("_ ", None)
assert tw_mock.lines[5] == ""
assert tw_mock.lines[6] == "> ???"
assert tw_mock.lines[7] == "E ValueError: 3"
assert tw_mock.lines[8] == ""
line = tw_mock.get_write_msg(9)
assert line.endswith("mod.py")
assert tw_mock.lines[10] == ":3: ValueError"
def test_toterminal_long_incomplete_source(self, importasmod, tmpdir, tw_mock):
mod = importasmod(
"""
def g(x):
raise ValueError(x)
def f():
g(3)
"""
)
excinfo = pytest.raises(ValueError, mod.f)
tmpdir.join("mod.py").write("asdf")
excinfo.traceback = excinfo.traceback.filter()
repr = excinfo.getrepr()
repr.toterminal(tw_mock)
assert tw_mock.lines[0] == ""
tw_mock.lines.pop(0)
assert tw_mock.lines[0] == "> ???"
assert tw_mock.lines[1] == ""
line = tw_mock.get_write_msg(2)
assert line.endswith("mod.py")
assert tw_mock.lines[3] == ":5: "
assert tw_mock.lines[4] == ("_ ", None)
assert tw_mock.lines[5] == ""
assert tw_mock.lines[6] == "> ???"
assert tw_mock.lines[7] == "E ValueError: 3"
assert tw_mock.lines[8] == ""
line = tw_mock.get_write_msg(9)
assert line.endswith("mod.py")
assert tw_mock.lines[10] == ":3: ValueError"
def test_toterminal_long_filenames(self, importasmod, tw_mock):
mod = importasmod(
"""
def f():
raise ValueError()
"""
)
excinfo = pytest.raises(ValueError, mod.f)
path = py.path.local(mod.__file__)
old = path.dirpath().chdir()
try:
repr = excinfo.getrepr(abspath=False)
repr.toterminal(tw_mock)
x = py.path.local().bestrelpath(path)
if len(x) < len(str(path)):
msg = tw_mock.get_write_msg(-2)
assert msg == "mod.py"
assert tw_mock.lines[-1] == ":3: ValueError"
repr = excinfo.getrepr(abspath=True)
repr.toterminal(tw_mock)
msg = tw_mock.get_write_msg(-2)
assert msg == path
line = tw_mock.lines[-1]
assert line == ":3: ValueError"
finally:
old.chdir()
@pytest.mark.parametrize(
"reproptions",
[
{
"style": style,
"showlocals": showlocals,
"funcargs": funcargs,
"tbfilter": tbfilter,
}
for style in ("long", "short", "no")
for showlocals in (True, False)
for tbfilter in (True, False)
for funcargs in (True, False)
],
)
def test_format_excinfo(self, importasmod, reproptions):
mod = importasmod(
"""
def g(x):
raise ValueError(x)
def f():
g(3)
"""
)
excinfo = pytest.raises(ValueError, mod.f)
tw = py.io.TerminalWriter(stringio=True)
repr = excinfo.getrepr(**reproptions)
repr.toterminal(tw)
assert tw.stringio.getvalue()
def test_traceback_repr_style(self, importasmod, tw_mock):
mod = importasmod(
"""
def f():
g()
def g():
h()
def h():
i()
def i():
raise ValueError()
"""
)
excinfo = pytest.raises(ValueError, mod.f)
excinfo.traceback = excinfo.traceback.filter()
excinfo.traceback[1].set_repr_style("short")
excinfo.traceback[2].set_repr_style("short")
r = excinfo.getrepr(style="long")
r.toterminal(tw_mock)
for line in tw_mock.lines:
print(line)
assert tw_mock.lines[0] == ""
assert tw_mock.lines[1] == " def f():"
assert tw_mock.lines[2] == "> g()"
assert tw_mock.lines[3] == ""
msg = tw_mock.get_write_msg(4)
assert msg.endswith("mod.py")
assert tw_mock.lines[5] == ":3: "
assert tw_mock.lines[6] == ("_ ", None)
tw_mock.get_write_msg(7)
assert tw_mock.lines[8].endswith("in g")
assert tw_mock.lines[9] == " h()"
tw_mock.get_write_msg(10)
assert tw_mock.lines[11].endswith("in h")
assert tw_mock.lines[12] == " i()"
assert tw_mock.lines[13] == ("_ ", None)
assert tw_mock.lines[14] == ""
assert tw_mock.lines[15] == " def i():"
assert tw_mock.lines[16] == "> raise ValueError()"
assert tw_mock.lines[17] == "E ValueError"
assert tw_mock.lines[18] == ""
msg = tw_mock.get_write_msg(19)
msg.endswith("mod.py")
assert tw_mock.lines[20] == ":9: ValueError"
def test_exc_chain_repr(self, importasmod, tw_mock):
mod = importasmod(
"""
class Err(Exception):
pass
def f():
try:
g()
except Exception as e:
raise Err() from e
finally:
h()
def g():
raise ValueError()
def h():
raise AttributeError()
"""
)
excinfo = pytest.raises(AttributeError, mod.f)
r = excinfo.getrepr(style="long")
r.toterminal(tw_mock)
for line in tw_mock.lines:
print(line)
assert tw_mock.lines[0] == ""
assert tw_mock.lines[1] == " def f():"
assert tw_mock.lines[2] == " try:"
assert tw_mock.lines[3] == "> g()"
assert tw_mock.lines[4] == ""
line = tw_mock.get_write_msg(5)
assert line.endswith("mod.py")
assert tw_mock.lines[6] == ":6: "
assert tw_mock.lines[7] == ("_ ", None)
assert tw_mock.lines[8] == ""
assert tw_mock.lines[9] == " def g():"
assert tw_mock.lines[10] == "> raise ValueError()"
assert tw_mock.lines[11] == "E ValueError"
assert tw_mock.lines[12] == ""
line = tw_mock.get_write_msg(13)
assert line.endswith("mod.py")
assert tw_mock.lines[14] == ":12: ValueError"
assert tw_mock.lines[15] == ""
assert (
tw_mock.lines[16]
== "The above exception was the direct cause of the following exception:"
)
assert tw_mock.lines[17] == ""
assert tw_mock.lines[18] == " def f():"
assert tw_mock.lines[19] == " try:"
assert tw_mock.lines[20] == " g()"
assert tw_mock.lines[21] == " except Exception as e:"
assert tw_mock.lines[22] == "> raise Err() from e"
assert tw_mock.lines[23] == "E test_exc_chain_repr0.mod.Err"
assert tw_mock.lines[24] == ""
line = tw_mock.get_write_msg(25)
assert line.endswith("mod.py")
assert tw_mock.lines[26] == ":8: Err"
assert tw_mock.lines[27] == ""
assert (
tw_mock.lines[28]
== "During handling of the above exception, another exception occurred:"
)
assert tw_mock.lines[29] == ""
assert tw_mock.lines[30] == " def f():"
assert tw_mock.lines[31] == " try:"
assert tw_mock.lines[32] == " g()"
assert tw_mock.lines[33] == " except Exception as e:"
assert tw_mock.lines[34] == " raise Err() from e"
assert tw_mock.lines[35] == " finally:"
assert tw_mock.lines[36] == "> h()"
assert tw_mock.lines[37] == ""
line = tw_mock.get_write_msg(38)
assert line.endswith("mod.py")
assert tw_mock.lines[39] == ":10: "
assert tw_mock.lines[40] == ("_ ", None)
assert tw_mock.lines[41] == ""
assert tw_mock.lines[42] == " def h():"
assert tw_mock.lines[43] == "> raise AttributeError()"
assert tw_mock.lines[44] == "E AttributeError"
assert tw_mock.lines[45] == ""
line = tw_mock.get_write_msg(46)
assert line.endswith("mod.py")
assert tw_mock.lines[47] == ":15: AttributeError"
@pytest.mark.parametrize("mode", ["from_none", "explicit_suppress"])
def test_exc_repr_chain_suppression(self, importasmod, mode, tw_mock):
"""Check that exc repr does not show chained exceptions in Python 3.
- When the exception is raised with "from None"
- Explicitly suppressed with "chain=False" to ExceptionInfo.getrepr().
"""
raise_suffix = " from None" if mode == "from_none" else ""
mod = importasmod(
"""
def f():
try:
g()
except Exception:
raise AttributeError(){raise_suffix}
def g():
raise ValueError()
""".format(
raise_suffix=raise_suffix
)
)
excinfo = pytest.raises(AttributeError, mod.f)
r = excinfo.getrepr(style="long", chain=mode != "explicit_suppress")
r.toterminal(tw_mock)
for line in tw_mock.lines:
print(line)
assert tw_mock.lines[0] == ""
assert tw_mock.lines[1] == " def f():"
assert tw_mock.lines[2] == " try:"
assert tw_mock.lines[3] == " g()"
assert tw_mock.lines[4] == " except Exception:"
assert tw_mock.lines[5] == "> raise AttributeError(){}".format(
raise_suffix
)
assert tw_mock.lines[6] == "E AttributeError"
assert tw_mock.lines[7] == ""
line = tw_mock.get_write_msg(8)
assert line.endswith("mod.py")
assert tw_mock.lines[9] == ":6: AttributeError"
assert len(tw_mock.lines) == 10
@pytest.mark.parametrize(
"reason, description",
[
pytest.param(
"cause",
"The above exception was the direct cause of the following exception:",
id="cause",
),
pytest.param(
"context",
"During handling of the above exception, another exception occurred:",
id="context",
),
],
)
def test_exc_chain_repr_without_traceback(self, importasmod, reason, description):
"""
Handle representation of exception chains where one of the exceptions doesn't have a
real traceback, such as those raised in a subprocess submitted by the multiprocessing
module (#1984).
"""
from _pytest.pytester import LineMatcher
exc_handling_code = " from e" if reason == "cause" else ""
mod = importasmod(
"""
def f():
try:
g()
except Exception as e:
raise RuntimeError('runtime problem'){exc_handling_code}
def g():
raise ValueError('invalid value')
""".format(
exc_handling_code=exc_handling_code
)
)
with pytest.raises(RuntimeError) as excinfo:
mod.f()
# emulate the issue described in #1984
attr = "__%s__" % reason
getattr(excinfo.value, attr).__traceback__ = None
r = excinfo.getrepr()
tw = py.io.TerminalWriter(stringio=True)
tw.hasmarkup = False
r.toterminal(tw)
matcher = LineMatcher(tw.stringio.getvalue().splitlines())
matcher.fnmatch_lines(
[
"ValueError: invalid value",
description,
"* except Exception as e:",
"> * raise RuntimeError('runtime problem')" + exc_handling_code,
"E *RuntimeError: runtime problem",
]
)
def test_exc_chain_repr_cycle(self, importasmod, tw_mock):
mod = importasmod(
"""
class Err(Exception):
pass
def fail():
return 0 / 0
def reraise():
try:
fail()
except ZeroDivisionError as e:
raise Err() from e
def unreraise():
try:
reraise()
except Err as e:
raise e.__cause__
"""
)
excinfo = pytest.raises(ZeroDivisionError, mod.unreraise)
r = excinfo.getrepr(style="short")
r.toterminal(tw_mock)
out = "\n".join(line for line in tw_mock.lines if isinstance(line, str))
expected_out = textwrap.dedent(
"""\
:13: in unreraise
reraise()
:10: in reraise
raise Err() from e
E test_exc_chain_repr_cycle0.mod.Err
During handling of the above exception, another exception occurred:
:15: in unreraise
raise e.__cause__
:8: in reraise
fail()
:5: in fail
return 0 / 0
E ZeroDivisionError: division by zero"""
)
assert out == expected_out
@pytest.mark.parametrize("style", ["short", "long"])
@pytest.mark.parametrize("encoding", [None, "utf8", "utf16"])
def test_repr_traceback_with_unicode(style, encoding):
msg = ""
if encoding is not None:
msg = msg.encode(encoding)
try:
raise RuntimeError(msg)
except RuntimeError:
e_info = ExceptionInfo.from_current()
formatter = FormattedExcinfo(style=style)
repr_traceback = formatter.repr_traceback(e_info)
assert repr_traceback is not None
def test_cwd_deleted(testdir):
testdir.makepyfile(
"""
def test(tmpdir):
tmpdir.chdir()
tmpdir.remove()
assert False
"""
)
result = testdir.runpytest()
result.stdout.fnmatch_lines(["* 1 failed in *"])
result.stdout.no_fnmatch_line("*INTERNALERROR*")
result.stderr.no_fnmatch_line("*INTERNALERROR*")
@pytest.mark.usefixtures("limited_recursion_depth")
def test_exception_repr_extraction_error_on_recursion():
"""
Ensure we can properly detect a recursion error even
if some locals raise error on comparison (#2459).
"""
from _pytest.pytester import LineMatcher
class numpy_like:
def __eq__(self, other):
if type(other) is numpy_like:
raise ValueError(
"The truth value of an array "
"with more than one element is ambiguous."
)
def a(x):
return b(numpy_like())
def b(x):
return a(numpy_like())
with pytest.raises(RuntimeError) as excinfo:
a(numpy_like())
matcher = LineMatcher(str(excinfo.getrepr()).splitlines())
matcher.fnmatch_lines(
[
"!!! Recursion error detected, but an error occurred locating the origin of recursion.",
"*The following exception happened*",
"*ValueError: The truth value of an array*",
]
)
@pytest.mark.usefixtures("limited_recursion_depth")
def test_no_recursion_index_on_recursion_error():
"""
Ensure that we don't break in case we can't find the recursion index
during a recursion error (#2486).
"""
class RecursionDepthError:
def __getattr__(self, attr):
return getattr(self, "_" + attr)
with pytest.raises(RuntimeError) as excinfo:
RecursionDepthError().trigger
assert "maximum recursion" in str(excinfo.getrepr())