265 lines
7.7 KiB
Python
265 lines
7.7 KiB
Python
import sys
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import py
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import pytest
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ast = pytest.importorskip("ast")
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from _pytest.assertion import util
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from _pytest.assertion.rewrite import rewrite_asserts
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def setup_module(mod):
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mod._old_reprcompare = util._reprcompare
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py.code._reprcompare = None
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def teardown_module(mod):
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util._reprcompare = mod._old_reprcompare
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del mod._old_reprcompare
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def rewrite(src):
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tree = ast.parse(src)
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rewrite_asserts(tree)
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return tree
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def getmsg(f, extra_ns=None, must_pass=False):
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"""Rewrite the assertions in f, run it, and get the failure message."""
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src = '\n'.join(py.code.Code(f).source().lines)
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mod = rewrite(src)
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code = compile(mod, "<test>", "exec")
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ns = {}
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if extra_ns is not None:
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ns.update(extra_ns)
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py.builtin.exec_(code, ns)
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func = ns[f.__name__]
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try:
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func()
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except AssertionError:
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if must_pass:
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pytest.fail("shouldn't have raised")
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s = str(sys.exc_info()[1])
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if not s.startswith("assert"):
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return "AssertionError: " + s
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return s
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else:
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if not must_pass:
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pytest.fail("function didn't raise at all")
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class TestAssertionRewrite:
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def test_place_initial_imports(self):
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s = """'Doc string'\nother = stuff"""
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m = rewrite(s)
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assert isinstance(m.body[0], ast.Expr)
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assert isinstance(m.body[0].value, ast.Str)
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for imp in m.body[1:3]:
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assert isinstance(imp, ast.Import)
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assert imp.lineno == 2
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assert imp.col_offset == 0
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assert isinstance(m.body[3], ast.Assign)
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s = """from __future__ import with_statement\nother_stuff"""
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m = rewrite(s)
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assert isinstance(m.body[0], ast.ImportFrom)
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for imp in m.body[1:3]:
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assert isinstance(imp, ast.Import)
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assert imp.lineno == 2
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assert imp.col_offset == 0
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assert isinstance(m.body[3], ast.Expr)
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s = """'doc string'\nfrom __future__ import with_statement\nother"""
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m = rewrite(s)
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assert isinstance(m.body[0], ast.Expr)
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assert isinstance(m.body[0].value, ast.Str)
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assert isinstance(m.body[1], ast.ImportFrom)
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for imp in m.body[2:4]:
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assert isinstance(imp, ast.Import)
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assert imp.lineno == 3
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assert imp.col_offset == 0
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assert isinstance(m.body[4], ast.Expr)
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s = """from . import relative\nother_stuff"""
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m = rewrite(s)
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for imp in m.body[0:2]:
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assert isinstance(imp, ast.Import)
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assert imp.lineno == 1
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assert imp.col_offset == 0
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assert isinstance(m.body[3], ast.Expr)
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def test_dont_rewrite(self):
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s = """'PYTEST_DONT_REWRITE'\nassert 14"""
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m = rewrite(s)
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assert len(m.body) == 2
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assert isinstance(m.body[0].value, ast.Str)
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assert isinstance(m.body[1], ast.Assert)
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assert m.body[1].msg is None
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def test_name(self):
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def f():
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assert False
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assert getmsg(f) == "assert False"
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def f():
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f = False
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assert f
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assert getmsg(f) == "assert False"
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def f():
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assert a_global
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assert getmsg(f, {"a_global" : False}) == "assert a_global"
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def test_assert_already_has_message(self):
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def f():
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assert False, "something bad!"
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assert getmsg(f) == "AssertionError: something bad!"
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def test_boolop(self):
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def f():
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f = g = False
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assert f and g
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assert getmsg(f) == "assert (False)"
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def f():
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f = True
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g = False
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assert f and g
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assert getmsg(f) == "assert (True and False)"
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def f():
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f = False
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g = True
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assert f and g
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assert getmsg(f) == "assert (False)"
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def f():
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f = g = False
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assert f or g
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assert getmsg(f) == "assert (False or False)"
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def f():
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f = g = False
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assert not f and not g
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getmsg(f, must_pass=True)
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def f():
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f = True
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g = False
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assert f or g
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getmsg(f, must_pass=True)
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def test_short_circut_evaluation(self):
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def f():
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assert True or explode
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getmsg(f, must_pass=True)
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def f():
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x = 1
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assert x == 1 or x == 2
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getmsg(f, must_pass=True)
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def test_unary_op(self):
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def f():
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x = True
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assert not x
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assert getmsg(f) == "assert not True"
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def f():
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x = 0
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assert ~x + 1
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assert getmsg(f) == "assert (~0 + 1)"
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def f():
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x = 3
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assert -x + x
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assert getmsg(f) == "assert (-3 + 3)"
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def f():
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x = 0
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assert +x + x
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assert getmsg(f) == "assert (+0 + 0)"
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def test_binary_op(self):
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def f():
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x = 1
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y = -1
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assert x + y
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assert getmsg(f) == "assert (1 + -1)"
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def test_call(self):
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def g(a=42, *args, **kwargs):
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return False
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ns = {"g" : g}
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def f():
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assert g()
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assert getmsg(f, ns) == """assert g()"""
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def f():
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assert g(1)
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assert getmsg(f, ns) == """assert g(1)"""
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def f():
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assert g(1, 2)
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assert getmsg(f, ns) == """assert g(1, 2)"""
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def f():
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assert g(1, g=42)
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assert getmsg(f, ns) == """assert g(1, g=42)"""
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def f():
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assert g(1, 3, g=23)
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assert getmsg(f, ns) == """assert g(1, 3, g=23)"""
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def test_attribute(self):
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class X(object):
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g = 3
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ns = {"X" : X, "x" : X()}
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def f():
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assert not x.g
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assert getmsg(f, ns) == """assert not 3
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+ where 3 = x.g"""
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def f():
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x.a = False
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assert x.a
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assert getmsg(f, ns) == """assert x.a"""
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def test_comparisons(self):
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def f():
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a, b = range(2)
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assert b < a
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assert getmsg(f) == """assert 1 < 0"""
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def f():
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a, b, c = range(3)
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assert a > b > c
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assert getmsg(f) == """assert 0 > 1"""
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def f():
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a, b, c = range(3)
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assert a < b > c
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assert getmsg(f) == """assert 1 > 2"""
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def f():
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a, b, c = range(3)
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assert a < b <= c
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getmsg(f, must_pass=True)
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def f():
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a, b, c = range(3)
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assert a < b
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assert b < c
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getmsg(f, must_pass=True)
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def test_len(self):
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def f():
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l = list(range(10))
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assert len(l) == 11
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assert getmsg(f).startswith("""assert 10 == 11
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+ where 10 = len([""")
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def test_custom_reprcompare(self, monkeypatch):
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def my_reprcompare(op, left, right):
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return "42"
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monkeypatch.setattr(util, "_reprcompare", my_reprcompare)
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def f():
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assert 42 < 3
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assert getmsg(f) == "assert 42"
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def my_reprcompare(op, left, right):
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return "%s %s %s" % (left, op, right)
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monkeypatch.setattr(util, "_reprcompare", my_reprcompare)
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def f():
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assert 1 < 3 < 5 <= 4 < 7
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assert getmsg(f) == "assert 5 <= 4"
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def test_assert_raising_nonzero_in_comparison(self):
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def f():
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class A(object):
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def __nonzero__(self):
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raise ValueError(42)
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def __lt__(self, other):
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return A()
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def __repr__(self):
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return "<MY42 object>"
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def myany(x):
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return False
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assert myany(A() < 0)
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assert "<MY42 object> < 0" in getmsg(f)
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