Demo of Python failure reports with pytest (original) (raw)
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Here is a nice run of several failures and how pytest presents things:
assertion $ pytest failure_demo.py =========================== test session starts ============================ platform linux -- Python 3.x.y, pytest-8.x.y, pluggy-1.x.y rootdir: /home/sweet/project/assertion collected 44 items
failure_demo.py FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF [100%]
================================= FAILURES ================================= ___________________________ test_generative[3-6] ___________________________
param1 = 3, param2 = 6
@pytest.mark.parametrize("param1, param2", [(3, 6)])
def test_generative(param1, param2):assert param1 * 2 < param2E assert (3 * 2) < 6
failure_demo.py:21: AssertionError _________________________ TestFailing.test_simple __________________________
self = <failure_demo.TestFailing object at 0xdeadbeef0001>
def test_simple(self):
def f():
return 42
def g():
return 43assert f() == g()E assert 42 == 43 E + where 42 = <function TestFailing.test_simple..f at 0xdeadbeef0002>() E + and 43 = <function TestFailing.test_simple..g at 0xdeadbeef0003>()
failure_demo.py:32: AssertionError ____________________ TestFailing.test_simple_multiline _____________________
self = <failure_demo.TestFailing object at 0xdeadbeef0004>
def test_simple_multiline(self):otherfunc_multi(42, 6 * 9)
failure_demo.py:35:
a = 42, b = 54
def otherfunc_multi(a, b):assert a == bE assert 42 == 54
failure_demo.py:16: AssertionError ___________________________ TestFailing.test_not ___________________________
self = <failure_demo.TestFailing object at 0xdeadbeef0005>
def test_not(self):
def f():
return 42assert not f()E assert not 42 E + where 42 = <function TestFailing.test_not..f at 0xdeadbeef0006>()
failure_demo.py:41: AssertionError _________________ TestSpecialisedExplanations.test_eq_text _________________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef0007>
def test_eq_text(self):assert "spam" == "eggs"E AssertionError: assert 'spam' == 'eggs' E E - eggs E + spam
failure_demo.py:46: AssertionError _____________ TestSpecialisedExplanations.test_eq_similar_text _____________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef0008>
def test_eq_similar_text(self):assert "foo 1 bar" == "foo 2 bar"E AssertionError: assert 'foo 1 bar' == 'foo 2 bar' E E - foo 2 bar E ? ^ E + foo 1 bar E ? ^
failure_demo.py:49: AssertionError ____________ TestSpecialisedExplanations.test_eq_multiline_text ____________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef0009>
def test_eq_multiline_text(self):assert "foo\nspam\nbar" == "foo\neggs\nbar"E AssertionError: assert 'foo\nspam\nbar' == 'foo\neggs\nbar' E E foo E - eggs E + spam E bar
failure_demo.py:52: AssertionError ______________ TestSpecialisedExplanations.test_eq_long_text _______________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef000a>
def test_eq_long_text(self):
a = "1" * 100 + "a" + "2" * 100
b = "1" * 100 + "b" + "2" * 100assert a == bE AssertionError: assert '111111111111...2222222222222' == '111111111111...2222222222222' E E Skipping 90 identical leading characters in diff, use -v to show E Skipping 91 identical trailing characters in diff, use -v to show E - 1111111111b222222222 E ? ^ E + 1111111111a222222222 E ? ^
failure_demo.py:57: AssertionError _________ TestSpecialisedExplanations.test_eq_long_text_multiline __________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef000b>
def test_eq_long_text_multiline(self):
a = "1\n" * 100 + "a" + "2\n" * 100
b = "1\n" * 100 + "b" + "2\n" * 100assert a == bE AssertionError: assert '1\n1\n1\n1\n...n2\n2\n2\n2\n' == '1\n1\n1\n1\n...n2\n2\n2\n2\n' E E Skipping 190 identical leading characters in diff, use -v to show E Skipping 191 identical trailing characters in diff, use -v to show E 1 E 1 E 1 E 1... E E ...Full output truncated (7 lines hidden), use '-vv' to show
failure_demo.py:62: AssertionError _________________ TestSpecialisedExplanations.test_eq_list _________________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef000c>
def test_eq_list(self):assert [0, 1, 2] == [0, 1, 3]E assert [0, 1, 2] == [0, 1, 3] E E At index 2 diff: 2 != 3 E Use -v to get more diff
failure_demo.py:65: AssertionError ______________ TestSpecialisedExplanations.test_eq_list_long _______________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef000d>
def test_eq_list_long(self):
a = [0] * 100 + [1] + [3] * 100
b = [0] * 100 + [2] + [3] * 100assert a == bE assert [0, 0, 0, 0, 0, 0, ...] == [0, 0, 0, 0, 0, 0, ...] E E At index 100 diff: 1 != 2 E Use -v to get more diff
failure_demo.py:70: AssertionError _________________ TestSpecialisedExplanations.test_eq_dict _________________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef000e>
def test_eq_dict(self):assert {"a": 0, "b": 1, "c": 0} == {"a": 0, "b": 2, "d": 0}E AssertionError: assert {'a': 0, 'b': 1, 'c': 0} == {'a': 0, 'b': 2, 'd': 0} E E Omitting 1 identical items, use -vv to show E Differing items: E {'b': 1} != {'b': 2} E Left contains 1 more item: E {'c': 0} E Right contains 1 more item: E {'d': 0} E Use -v to get more diff
failure_demo.py:73: AssertionError _________________ TestSpecialisedExplanations.test_eq_set __________________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef000f>
def test_eq_set(self):assert {0, 10, 11, 12} == {0, 20, 21}E assert {0, 10, 11, 12} == {0, 20, 21} E E Extra items in the left set: E 10 E 11 E 12 E Extra items in the right set: E 20 E 21 E Use -v to get more diff
failure_demo.py:76: AssertionError _____________ TestSpecialisedExplanations.test_eq_longer_list ______________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef0010>
def test_eq_longer_list(self):assert [1, 2] == [1, 2, 3]E assert [1, 2] == [1, 2, 3] E E Right contains one more item: 3 E Use -v to get more diff
failure_demo.py:79: AssertionError _________________ TestSpecialisedExplanations.test_in_list _________________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef0011>
def test_in_list(self):assert 1 in [0, 2, 3, 4, 5]E assert 1 in [0, 2, 3, 4, 5]
failure_demo.py:82: AssertionError __________ TestSpecialisedExplanations.test_not_in_text_multiline __________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef0012>
def test_not_in_text_multiline(self):
text = "some multiline\ntext\nwhich\nincludes foo\nand a\ntail"assert "foo" not in textE AssertionError: assert 'foo' not in 'some multil...nand a\ntail' E E 'foo' is contained here: E some multiline E text E which E includes foo E ? +++ E and a E tail
failure_demo.py:86: AssertionError ___________ TestSpecialisedExplanations.test_not_in_text_single ____________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef0013>
def test_not_in_text_single(self):
text = "single foo line"assert "foo" not in textE AssertionError: assert 'foo' not in 'single foo line' E E 'foo' is contained here: E single foo line E ? +++
failure_demo.py:90: AssertionError _________ TestSpecialisedExplanations.test_not_in_text_single_long _________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef0014>
def test_not_in_text_single_long(self):
text = "head " * 50 + "foo " + "tail " * 20assert "foo" not in textE AssertionError: assert 'foo' not in 'head head h...l tail tail ' E E 'foo' is contained here: E head head foo tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail E ? +++
failure_demo.py:94: AssertionError ______ TestSpecialisedExplanations.test_not_in_text_single_long_term _______
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef0015>
def test_not_in_text_single_long_term(self):
text = "head " * 50 + "f" * 70 + "tail " * 20assert "f" * 70 not in textE AssertionError: assert 'fffffffffff...ffffffffffff' not in 'head head h...l tail tail ' E E 'ffffffffffffffffff...fffffffffffffffffff' is contained here: E head head fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffftail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail tail E ? ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
failure_demo.py:98: AssertionError ______________ TestSpecialisedExplanations.test_eq_dataclass _______________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef0016>
def test_eq_dataclass(self):
from dataclasses import dataclass
@dataclass
class Foo:
a: int
b: str
left = Foo(1, "b")
right = Foo(1, "c")assert left == rightE AssertionError: assert TestSpecialis...oo(a=1, b='b') == TestSpecialis...oo(a=1, b='c') E E Omitting 1 identical items, use -vv to show E Differing attributes: E ['b'] E E Drill down into differing attribute b: E b: 'b' != 'c' E - c E + b
failure_demo.py:110: AssertionError ________________ TestSpecialisedExplanations.test_eq_attrs _________________
self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef0017>
def test_eq_attrs(self):
import attr
@attr.s
class Foo:
a = attr.ib()
b = attr.ib()
left = Foo(1, "b")
right = Foo(1, "c")assert left == rightE AssertionError: assert Foo(a=1, b='b') == Foo(a=1, b='c') E E Omitting 1 identical items, use -vv to show E Differing attributes: E ['b'] E E Drill down into differing attribute b: E b: 'b' != 'c' E - c E + b
failure_demo.py:122: AssertionError ______________________________ test_attribute ______________________________
def test_attribute():
class Foo:
b = 1
i = Foo()assert i.b == 2E assert 1 == 2 E + where 1 = <failure_demo.test_attribute..Foo object at 0xdeadbeef0018>.b
failure_demo.py:130: AssertionError _________________________ test_attribute_instance __________________________
def test_attribute_instance():
class Foo:
b = 1assert Foo().b == 2E AssertionError: assert 1 == 2 E + where 1 = <failure_demo.test_attribute_instance..Foo object at 0xdeadbeef0019>.b E + where <failure_demo.test_attribute_instance..Foo object at 0xdeadbeef0019> = <class 'failure_demo.test_attribute_instance..Foo'>()
failure_demo.py:137: AssertionError __________________________ test_attribute_failure __________________________
def test_attribute_failure():
class Foo:
def _get_b(self):
raise Exception("Failed to get attrib")
b = property(_get_b)
i = Foo()assert i.b == 2
failure_demo.py:148:
self = <failure_demo.test_attribute_failure..Foo object at 0xdeadbeef001a>
def _get_b(self):raise Exception("Failed to get attrib")E Exception: Failed to get attrib
failure_demo.py:143: Exception _________________________ test_attribute_multiple __________________________
def test_attribute_multiple():
class Foo:
b = 1
class Bar:
b = 2assert Foo().b == Bar().bE AssertionError: assert 1 == 2 E + where 1 = <failure_demo.test_attribute_multiple..Foo object at 0xdeadbeef001b>.b E + where <failure_demo.test_attribute_multiple..Foo object at 0xdeadbeef001b> = <class 'failure_demo.test_attribute_multiple..Foo'>() E + and 2 = <failure_demo.test_attribute_multiple..Bar object at 0xdeadbeef001c>.b E + where <failure_demo.test_attribute_multiple..Bar object at 0xdeadbeef001c> = <class 'failure_demo.test_attribute_multiple..Bar'>()
failure_demo.py:158: AssertionError __________________________ TestRaises.test_raises __________________________
self = <failure_demo.TestRaises object at 0xdeadbeef001d>
def test_raises(self):
s = "qwe"raises(TypeError, int, s)E ValueError: invalid literal for int() with base 10: 'qwe'
failure_demo.py:168: ValueError ______________________ TestRaises.test_raises_doesnt _______________________
self = <failure_demo.TestRaises object at 0xdeadbeef001e>
def test_raises_doesnt(self):raises(OSError, int, "3")E Failed: DID NOT RAISE <class 'OSError'>
failure_demo.py:171: Failed __________________________ TestRaises.test_raise ___________________________
self = <failure_demo.TestRaises object at 0xdeadbeef001f>
def test_raise(self):raise ValueError("demo error")E ValueError: demo error
failure_demo.py:174: ValueError ________________________ TestRaises.test_tupleerror ________________________
self = <failure_demo.TestRaises object at 0xdeadbeef0020>
def test_tupleerror(self):a, b = [1] # noqa: F841E ValueError: not enough values to unpack (expected 2, got 1)
failure_demo.py:177: ValueError ______ TestRaises.test_reinterpret_fails_with_print_for_the_fun_of_it ______
self = <failure_demo.TestRaises object at 0xdeadbeef0021>
def test_reinterpret_fails_with_print_for_the_fun_of_it(self):
items = [1, 2, 3]
print(f"items is {items!r}")a, b = items.pop()E TypeError: cannot unpack non-iterable int object
failure_demo.py:182: TypeError --------------------------- Captured stdout call --------------------------- items is [1, 2, 3] ________________________ TestRaises.test_some_error ________________________
self = <failure_demo.TestRaises object at 0xdeadbeef0022>
def test_some_error(self):if namenotexi: # noqa: F821E NameError: name 'namenotexi' is not defined
failure_demo.py:185: NameError ____________________ test_dynamic_compile_shows_nicely _____________________
def test_dynamic_compile_shows_nicely():
import importlib.util
import sys
src = "def foo():\n assert 1 == 0\n"
name = "abc-123"
spec = importlib.util.spec_from_loader(name, loader=None)
module = importlib.util.module_from_spec(spec)
code = compile(src, name, "exec")
exec(code, module.__dict__)
sys.modules[name] = modulemodule.foo()
failure_demo.py:204:
??? E AssertionError
abc-123:2: AssertionError ____________________ TestMoreErrors.test_complex_error _____________________
self = <failure_demo.TestMoreErrors object at 0xdeadbeef0023>
def test_complex_error(self):
def f():
return 44
def g():
return 43somefunc(f(), g())
failure_demo.py:215:
failure_demo.py:12: in somefunc otherfunc(x, y)
a = 44, b = 43
def otherfunc(a, b):assert a == bE assert 44 == 43
failure_demo.py:8: AssertionError ___________________ TestMoreErrors.test_z1_unpack_error ____________________
self = <failure_demo.TestMoreErrors object at 0xdeadbeef0024>
def test_z1_unpack_error(self):
items = []a, b = itemsE ValueError: not enough values to unpack (expected 2, got 0)
failure_demo.py:219: ValueError ____________________ TestMoreErrors.test_z2_type_error _____________________
self = <failure_demo.TestMoreErrors object at 0xdeadbeef0025>
def test_z2_type_error(self):
items = 3a, b = itemsE TypeError: cannot unpack non-iterable int object
failure_demo.py:223: TypeError ______________________ TestMoreErrors.test_startswith ______________________
self = <failure_demo.TestMoreErrors object at 0xdeadbeef0026>
def test_startswith(self):
s = "123"
g = "456"assert s.startswith(g)E AssertionError: assert False E + where False = <built-in method startswith of str object at 0xdeadbeef0027>('456') E + where <built-in method startswith of str object at 0xdeadbeef0027> = '123'.startswith
failure_demo.py:228: AssertionError __________________ TestMoreErrors.test_startswith_nested ___________________
self = <failure_demo.TestMoreErrors object at 0xdeadbeef0028>
def test_startswith_nested(self):
def f():
return "123"
def g():
return "456"assert f().startswith(g())E AssertionError: assert False E + where False = <built-in method startswith of str object at 0xdeadbeef0027>('456') E + where <built-in method startswith of str object at 0xdeadbeef0027> = '123'.startswith E + where '123' = <function TestMoreErrors.test_startswith_nested..f at 0xdeadbeef0029>() E + and '456' = <function TestMoreErrors.test_startswith_nested..g at 0xdeadbeef0003>()
failure_demo.py:237: AssertionError _____________________ TestMoreErrors.test_global_func ______________________
self = <failure_demo.TestMoreErrors object at 0xdeadbeef002a>
def test_global_func(self):assert isinstance(globf(42), float)E assert False E + where False = isinstance(43, float) E + where 43 = globf(42)
failure_demo.py:240: AssertionError _______________________ TestMoreErrors.test_instance _______________________
self = <failure_demo.TestMoreErrors object at 0xdeadbeef002b>
def test_instance(self):
self.x = 6 * 7assert self.x != 42E assert 42 != 42 E + where 42 = <failure_demo.TestMoreErrors object at 0xdeadbeef002b>.x
failure_demo.py:244: AssertionError _______________________ TestMoreErrors.test_compare ________________________
self = <failure_demo.TestMoreErrors object at 0xdeadbeef002c>
def test_compare(self):assert globf(10) < 5E assert 11 < 5 E + where 11 = globf(10)
failure_demo.py:247: AssertionError _____________________ TestMoreErrors.test_try_finally ______________________
self = <failure_demo.TestMoreErrors object at 0xdeadbeef002d>
def test_try_finally(self):
x = 1
try:assert x == 0E assert 1 == 0
failure_demo.py:252: AssertionError ___________________ TestCustomAssertMsg.test_single_line ___________________
self = <failure_demo.TestCustomAssertMsg object at 0xdeadbeef002e>
def test_single_line(self):
class A:
a = 1
b = 2assert A.a == b, "A.a appears not to be b"E AssertionError: A.a appears not to be b E assert 1 == 2 E + where 1 = <class 'failure_demo.TestCustomAssertMsg.test_single_line..A'>.a
failure_demo.py:263: AssertionError ____________________ TestCustomAssertMsg.test_multiline ____________________
self = <failure_demo.TestCustomAssertMsg object at 0xdeadbeef002f>
def test_multiline(self):
class A:
a = 1
b = 2assert ( A.a == b ), "A.a appears not to be b\nor does not appear to be b\none of those"E AssertionError: A.a appears not to be b E or does not appear to be b E one of those E assert 1 == 2 E + where 1 = <class 'failure_demo.TestCustomAssertMsg.test_multiline..A'>.a
failure_demo.py:270: AssertionError ___________________ TestCustomAssertMsg.test_custom_repr ___________________
self = <failure_demo.TestCustomAssertMsg object at 0xdeadbeef0030>
def test_custom_repr(self):
class JSON:
a = 1
def __repr__(self):
return "This is JSON\n{\n 'foo': 'bar'\n}"
a = JSON()
b = 2assert a.a == b, aE AssertionError: This is JSON E { E 'foo': 'bar' E } E assert 1 == 2 E + where 1 = This is JSON\n{\n 'foo': 'bar'\n}.a
failure_demo.py:283: AssertionError ========================= short test summary info ========================== FAILED failure_demo.py::test_generative[3-6] - assert (3 * 2) < 6 FAILED failure_demo.py::TestFailing::test_simple - assert 42 == 43 FAILED failure_demo.py::TestFailing::test_simple_multiline - assert 42 == 54 FAILED failure_demo.py::TestFailing::test_not - assert not 42 FAILED failure_demo.py::TestSpecialisedExplanations::test_eq_text - Asser... FAILED failure_demo.py::TestSpecialisedExplanations::test_eq_similar_text FAILED failure_demo.py::TestSpecialisedExplanations::test_eq_multiline_text FAILED failure_demo.py::TestSpecialisedExplanations::test_eq_long_text - ... FAILED failure_demo.py::TestSpecialisedExplanations::test_eq_long_text_multiline FAILED failure_demo.py::TestSpecialisedExplanations::test_eq_list - asser... FAILED failure_demo.py::TestSpecialisedExplanations::test_eq_list_long - ... FAILED failure_demo.py::TestSpecialisedExplanations::test_eq_dict - Asser... FAILED failure_demo.py::TestSpecialisedExplanations::test_eq_set - assert... FAILED failure_demo.py::TestSpecialisedExplanations::test_eq_longer_list FAILED failure_demo.py::TestSpecialisedExplanations::test_in_list - asser... FAILED failure_demo.py::TestSpecialisedExplanations::test_not_in_text_multiline FAILED failure_demo.py::TestSpecialisedExplanations::test_not_in_text_single FAILED failure_demo.py::TestSpecialisedExplanations::test_not_in_text_single_long FAILED failure_demo.py::TestSpecialisedExplanations::test_not_in_text_single_long_term FAILED failure_demo.py::TestSpecialisedExplanations::test_eq_dataclass - ... FAILED failure_demo.py::TestSpecialisedExplanations::test_eq_attrs - Asse... FAILED failure_demo.py::test_attribute - assert 1 == 2 FAILED failure_demo.py::test_attribute_instance - AssertionError: assert ... FAILED failure_demo.py::test_attribute_failure - Exception: Failed to get... FAILED failure_demo.py::test_attribute_multiple - AssertionError: assert ... FAILED failure_demo.py::TestRaises::test_raises - ValueError: invalid lit... FAILED failure_demo.py::TestRaises::test_raises_doesnt - Failed: DID NOT ... FAILED failure_demo.py::TestRaises::test_raise - ValueError: demo error FAILED failure_demo.py::TestRaises::test_tupleerror - ValueError: not eno... FAILED failure_demo.py::TestRaises::test_reinterpret_fails_with_print_for_the_fun_of_it FAILED failure_demo.py::TestRaises::test_some_error - NameError: name 'na... FAILED failure_demo.py::test_dynamic_compile_shows_nicely - AssertionError FAILED failure_demo.py::TestMoreErrors::test_complex_error - assert 44 == 43 FAILED failure_demo.py::TestMoreErrors::test_z1_unpack_error - ValueError... FAILED failure_demo.py::TestMoreErrors::test_z2_type_error - TypeError: c... FAILED failure_demo.py::TestMoreErrors::test_startswith - AssertionError:... FAILED failure_demo.py::TestMoreErrors::test_startswith_nested - Assertio... FAILED failure_demo.py::TestMoreErrors::test_global_func - assert False FAILED failure_demo.py::TestMoreErrors::test_instance - assert 42 != 42 FAILED failure_demo.py::TestMoreErrors::test_compare - assert 11 < 5 FAILED failure_demo.py::TestMoreErrors::test_try_finally - assert 1 == 0 FAILED failure_demo.py::TestCustomAssertMsg::test_single_line - Assertion... FAILED failure_demo.py::TestCustomAssertMsg::test_multiline - AssertionEr... FAILED failure_demo.py::TestCustomAssertMsg::test_custom_repr - Assertion... ============================ 44 failed in 0.12s ============================