test_ok1/doc/en/example/reportingdemo.rst

.. _`tbreportdemo`:

Demo of Python failure reports with pytest
==================================================

Here is a nice run of several tens of failures
and how ``pytest`` presents things (unfortunately
not showing the nice colors here in the HTML that you
get on the terminal - we are working on that):

.. code-block:: pytest

    assertion $ pytest failure_demo.py
    ================================ test session starts =================================
    platform linux -- Python 3.x.y, pytest-4.x.y, py-1.x.y, pluggy-0.x.y
    hypothesis profile 'default' -> database=DirectoryBasedExampleDatabase('$REGENDOC_TMPDIR/assertion/.hypothesis/examples')
    rootdir: $REGENDOC_TMPDIR/assertion, inifile:
    plugins: hypothesis-3.x.y
    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 < param2
    E       assert (3 * 2) < 6

    failure_demo.py:22: AssertionError
    ______________________________ TestFailing.test_simple _______________________________

    self = <failure_demo.TestFailing object at 0xdeadbeef>

        def test_simple(self):
            def f():
                return 42

            def g():
                return 43

    >       assert f() == g()
    E       assert 42 == 43
    E        +  where 42 = <function TestFailing.test_simple.<locals>.f at 0xdeadbeef>()
    E        +  and   43 = <function TestFailing.test_simple.<locals>.g at 0xdeadbeef>()

    failure_demo.py:33: AssertionError
    _________________________ TestFailing.test_simple_multiline __________________________

    self = <failure_demo.TestFailing object at 0xdeadbeef>

        def test_simple_multiline(self):
    >       otherfunc_multi(42, 6 * 9)

    failure_demo.py:36:
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    a = 42, b = 54

        def otherfunc_multi(a, b):
    >       assert a == b
    E       assert 42 == 54

    failure_demo.py:17: AssertionError
    ________________________________ TestFailing.test_not ________________________________

    self = <failure_demo.TestFailing object at 0xdeadbeef>

        def test_not(self):
            def f():
                return 42

    >       assert not f()
    E       assert not 42
    E        +  where 42 = <function TestFailing.test_not.<locals>.f at 0xdeadbeef>()

    failure_demo.py:42: AssertionError
    ______________________ TestSpecialisedExplanations.test_eq_text ______________________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_eq_text(self):
    >       assert "spam" == "eggs"
    E       AssertionError: assert 'spam' == 'eggs'
    E         - spam
    E         + eggs

    failure_demo.py:47: AssertionError
    __________________ TestSpecialisedExplanations.test_eq_similar_text __________________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_eq_similar_text(self):
    >       assert "foo 1 bar" == "foo 2 bar"
    E       AssertionError: assert 'foo 1 bar' == 'foo 2 bar'
    E         - foo 1 bar
    E         ?     ^
    E         + foo 2 bar
    E         ?     ^

    failure_demo.py:50: AssertionError
    _________________ TestSpecialisedExplanations.test_eq_multiline_text _________________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_eq_multiline_text(self):
    >       assert "foo\nspam\nbar" == "foo\neggs\nbar"
    E       AssertionError: assert 'foo\nspam\nbar' == 'foo\neggs\nbar'
    E           foo
    E         - spam
    E         + eggs
    E           bar

    failure_demo.py:53: AssertionError
    ___________________ TestSpecialisedExplanations.test_eq_long_text ____________________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_eq_long_text(self):
            a = "1" * 100 + "a" + "2" * 100
            b = "1" * 100 + "b" + "2" * 100
    >       assert a == b
    E       AssertionError: assert '111111111111...2222222222222' == '1111111111111...2222222222222'
    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         - 1111111111a222222222
    E         ?           ^
    E         + 1111111111b222222222
    E         ?           ^

    failure_demo.py:58: AssertionError
    ______________ TestSpecialisedExplanations.test_eq_long_text_multiline _______________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_eq_long_text_multiline(self):
            a = "1\n" * 100 + "a" + "2\n" * 100
            b = "1\n" * 100 + "b" + "2\n" * 100
    >       assert a == b
    E       AssertionError: assert '1\n1\n1\n1\n...n2\n2\n2\n2\n' == '1\n1\n1\n1\n1...n2\n2\n2\n2\n'
    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           1...
    E
    E         ...Full output truncated (7 lines hidden), use '-vv' to show

    failure_demo.py:63: AssertionError
    ______________________ TestSpecialisedExplanations.test_eq_list ______________________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_eq_list(self):
    >       assert [0, 1, 2] == [0, 1, 3]
    E       assert [0, 1, 2] == [0, 1, 3]
    E         At index 2 diff: 2 != 3
    E         Use -v to get the full diff

    failure_demo.py:66: AssertionError
    ___________________ TestSpecialisedExplanations.test_eq_list_long ____________________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_eq_list_long(self):
            a = [0] * 100 + [1] + [3] * 100
            b = [0] * 100 + [2] + [3] * 100
    >       assert a == b
    E       assert [0, 0, 0, 0, 0, 0, ...] == [0, 0, 0, 0, 0, 0, ...]
    E         At index 100 diff: 1 != 2
    E         Use -v to get the full diff

    failure_demo.py:71: AssertionError
    ______________________ TestSpecialisedExplanations.test_eq_dict ______________________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        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         Omitting 1 identical items, use -vv to show
    E         Differing items:
    E         {'b': 1} != {'b': 2}
    E         Left contains more items:
    E         {'c': 0}
    E         Right contains more items:
    E         {'d': 0}...
    E
    E         ...Full output truncated (2 lines hidden), use '-vv' to show

    failure_demo.py:74: AssertionError
    ______________________ TestSpecialisedExplanations.test_eq_set _______________________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_eq_set(self):
    >       assert {0, 10, 11, 12} == {0, 20, 21}
    E       AssertionError: assert {0, 10, 11, 12} == {0, 20, 21}
    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
    E         ...Full output truncated (2 lines hidden), use '-vv' to show

    failure_demo.py:77: AssertionError
    __________________ TestSpecialisedExplanations.test_eq_longer_list ___________________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_eq_longer_list(self):
    >       assert [1, 2] == [1, 2, 3]
    E       assert [1, 2] == [1, 2, 3]
    E         Right contains more items, first extra item: 3
    E         Use -v to get the full diff

    failure_demo.py:80: AssertionError
    ______________________ TestSpecialisedExplanations.test_in_list ______________________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        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:83: AssertionError
    _______________ TestSpecialisedExplanations.test_not_in_text_multiline _______________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_not_in_text_multiline(self):
            text = "some multiline\ntext\nwhich\nincludes foo\nand a\ntail"
    >       assert "foo" not in text
    E       AssertionError: assert 'foo' not in 'some multiline\ntext\nw...ncludes foo\nand a\ntail'
    E         'foo' is contained here:
    E           some multiline
    E           text
    E           which
    E           includes foo
    E         ?          +++
    E           and a...
    E
    E         ...Full output truncated (2 lines hidden), use '-vv' to show

    failure_demo.py:87: AssertionError
    ________________ TestSpecialisedExplanations.test_not_in_text_single _________________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_not_in_text_single(self):
            text = "single foo line"
    >       assert "foo" not in text
    E       AssertionError: assert 'foo' not in 'single foo line'
    E         'foo' is contained here:
    E           single foo line
    E         ?        +++

    failure_demo.py:91: AssertionError
    ______________ TestSpecialisedExplanations.test_not_in_text_single_long ______________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_not_in_text_single_long(self):
            text = "head " * 50 + "foo " + "tail " * 20
    >       assert "foo" not in text
    E       AssertionError: assert 'foo' not in 'head head head head hea...ail tail tail tail tail '
    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:95: AssertionError
    ___________ TestSpecialisedExplanations.test_not_in_text_single_long_term ____________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_not_in_text_single_long_term(self):
            text = "head " * 50 + "f" * 70 + "tail " * 20
    >       assert "f" * 70 not in text
    E       AssertionError: assert 'fffffffffff...ffffffffffff' not in 'head head he...l tail tail '
    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:99: AssertionError
    ___________________ TestSpecialisedExplanations.test_eq_dataclass ____________________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_eq_dataclass(self):
            from dataclasses import dataclass

            @dataclass
            class Foo(object):
                a: int
                b: str

            left = Foo(1, "b")
            right = Foo(1, "c")
    >       assert left == right
    E       AssertionError: assert TestSpecialis...oo(a=1, b='b') == TestSpecialise...oo(a=1, b='c')
    E         Omitting 1 identical items, use -vv to show
    E         Differing attributes:
    E         b: 'b' != 'c'

    failure_demo.py:111: AssertionError
    _____________________ TestSpecialisedExplanations.test_eq_attrs ______________________

    self = <failure_demo.TestSpecialisedExplanations object at 0xdeadbeef>

        def test_eq_attrs(self):
            import attr

            @attr.s
            class Foo(object):
                a = attr.ib()
                b = attr.ib()

            left = Foo(1, "b")
            right = Foo(1, "c")
    >       assert left == right
    E       AssertionError: assert Foo(a=1, b='b') == Foo(a=1, b='c')
    E         Omitting 1 identical items, use -vv to show
    E         Differing attributes:
    E         b: 'b' != 'c'

    failure_demo.py:123: AssertionError
    ___________________________________ test_attribute ___________________________________

        def test_attribute():
            class Foo(object):
                b = 1

            i = Foo()
    >       assert i.b == 2
    E       assert 1 == 2
    E        +  where 1 = <failure_demo.test_attribute.<locals>.Foo object at 0xdeadbeef>.b

    failure_demo.py:131: AssertionError
    ______________________________ test_attribute_instance _______________________________

        def test_attribute_instance():
            class Foo(object):
                b = 1

    >       assert Foo().b == 2
    E       AssertionError: assert 1 == 2
    E        +  where 1 = <failure_demo.test_attribute_instance.<locals>.Foo object at 0xdeadbeef>.b
    E        +    where <failure_demo.test_attribute_instance.<locals>.Foo object at 0xdeadbeef> = <class 'failure_demo.test_attribute_instance.<locals>.Foo'>()

    failure_demo.py:138: AssertionError
    _______________________________ test_attribute_failure _______________________________

        def test_attribute_failure():
            class Foo(object):
                def _get_b(self):
                    raise Exception("Failed to get attrib")

                b = property(_get_b)

            i = Foo()
    >       assert i.b == 2

    failure_demo.py:149:
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    self = <failure_demo.test_attribute_failure.<locals>.Foo object at 0xdeadbeef>

        def _get_b(self):
    >       raise Exception("Failed to get attrib")
    E       Exception: Failed to get attrib

    failure_demo.py:144: Exception
    ______________________________ test_attribute_multiple _______________________________

        def test_attribute_multiple():
            class Foo(object):
                b = 1

            class Bar(object):
                b = 2

    >       assert Foo().b == Bar().b
    E       AssertionError: assert 1 == 2
    E        +  where 1 = <failure_demo.test_attribute_multiple.<locals>.Foo object at 0xdeadbeef>.b
    E        +    where <failure_demo.test_attribute_multiple.<locals>.Foo object at 0xdeadbeef> = <class 'failure_demo.test_attribute_multiple.<locals>.Foo'>()
    E        +  and   2 = <failure_demo.test_attribute_multiple.<locals>.Bar object at 0xdeadbeef>.b
    E        +    where <failure_demo.test_attribute_multiple.<locals>.Bar object at 0xdeadbeef> = <class 'failure_demo.test_attribute_multiple.<locals>.Bar'>()

    failure_demo.py:159: AssertionError
    _______________________________ TestRaises.test_raises _______________________________

    self = <failure_demo.TestRaises object at 0xdeadbeef>

        def test_raises(self):
            s = "qwe"
    >       raises(TypeError, int, s)
    E       ValueError: invalid literal for int() with base 10: 'qwe'

    failure_demo.py:169: ValueError
    ___________________________ TestRaises.test_raises_doesnt ____________________________

    self = <failure_demo.TestRaises object at 0xdeadbeef>

        def test_raises_doesnt(self):
    >       raises(IOError, int, "3")
    E       Failed: DID NOT RAISE <class 'OSError'>

    failure_demo.py:172: Failed
    _______________________________ TestRaises.test_raise ________________________________

    self = <failure_demo.TestRaises object at 0xdeadbeef>

        def test_raise(self):
    >       raise ValueError("demo error")
    E       ValueError: demo error

    failure_demo.py:175: ValueError
    _____________________________ TestRaises.test_tupleerror _____________________________

    self = <failure_demo.TestRaises object at 0xdeadbeef>

        def test_tupleerror(self):
    >       a, b = [1]  # NOQA
    E       ValueError: not enough values to unpack (expected 2, got 1)

    failure_demo.py:178: ValueError
    ___________ TestRaises.test_reinterpret_fails_with_print_for_the_fun_of_it ___________

    self = <failure_demo.TestRaises object at 0xdeadbeef>

        def test_reinterpret_fails_with_print_for_the_fun_of_it(self):
            items = [1, 2, 3]
            print("items is %r" % items)
    >       a, b = items.pop()
    E       TypeError: 'int' object is not iterable

    failure_demo.py:183: TypeError
    -------------------------------- Captured stdout call --------------------------------
    items is [1, 2, 3]
    _____________________________ TestRaises.test_some_error _____________________________

    self = <failure_demo.TestRaises object at 0xdeadbeef>

        def test_some_error(self):
    >       if namenotexi:  # NOQA
    E       NameError: name 'namenotexi' is not defined

    failure_demo.py:186: NameError
    _________________________ test_dynamic_compile_shows_nicely __________________________

        def test_dynamic_compile_shows_nicely():
            import imp
            import sys

            src = "def foo():\n assert 1 == 0\n"
            name = "abc-123"
            module = imp.new_module(name)
            code = _pytest._code.compile(src, name, "exec")
            six.exec_(code, module.__dict__)
            sys.modules[name] = module
    >       module.foo()

    failure_demo.py:204:
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

        def foo():
    >    assert 1 == 0
    E    AssertionError

    <0-codegen 'abc-123' $REGENDOC_TMPDIR/assertion/failure_demo.py:201>:2: AssertionError
    _________________________ TestMoreErrors.test_complex_error __________________________

    self = <failure_demo.TestMoreErrors object at 0xdeadbeef>

        def test_complex_error(self):
            def f():
                return 44

            def g():
                return 43

    >       somefunc(f(), g())

    failure_demo.py:215:
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    failure_demo.py:13: in somefunc
        otherfunc(x, y)
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    a = 44, b = 43

        def otherfunc(a, b):
    >       assert a == b
    E       assert 44 == 43

    failure_demo.py:9: AssertionError
    ________________________ TestMoreErrors.test_z1_unpack_error _________________________

    self = <failure_demo.TestMoreErrors object at 0xdeadbeef>

        def test_z1_unpack_error(self):
            items = []
    >       a, b = items
    E       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 0xdeadbeef>

        def test_z2_type_error(self):
            items = 3
    >       a, b = items
    E       TypeError: 'int' object is not iterable

    failure_demo.py:223: TypeError
    ___________________________ TestMoreErrors.test_startswith ___________________________

    self = <failure_demo.TestMoreErrors object at 0xdeadbeef>

        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 0xdeadbeef>('456')
    E        +    where <built-in method startswith of str object at 0xdeadbeef> = '123'.startswith

    failure_demo.py:228: AssertionError
    _______________________ TestMoreErrors.test_startswith_nested ________________________

    self = <failure_demo.TestMoreErrors object at 0xdeadbeef>

        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 0xdeadbeef>('456')
    E        +    where <built-in method startswith of str object at 0xdeadbeef> = '123'.startswith
    E        +      where '123' = <function TestMoreErrors.test_startswith_nested.<locals>.f at 0xdeadbeef>()
    E        +    and   '456' = <function TestMoreErrors.test_startswith_nested.<locals>.g at 0xdeadbeef>()

    failure_demo.py:237: AssertionError
    __________________________ TestMoreErrors.test_global_func ___________________________

    self = <failure_demo.TestMoreErrors object at 0xdeadbeef>

        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 0xdeadbeef>

        def test_instance(self):
            self.x = 6 * 7
    >       assert self.x != 42
    E       assert 42 != 42
    E        +  where 42 = <failure_demo.TestMoreErrors object at 0xdeadbeef>.x

    failure_demo.py:244: AssertionError
    ____________________________ TestMoreErrors.test_compare _____________________________

    self = <failure_demo.TestMoreErrors object at 0xdeadbeef>

        def test_compare(self):
    >       assert globf(10) < 5
    E       assert 11 < 5
    E        +  where 11 = globf(10)

    failure_demo.py:247: AssertionError
    __________________________ TestMoreErrors.test_try_finally ___________________________

    self = <failure_demo.TestMoreErrors object at 0xdeadbeef>

        def test_try_finally(self):
            x = 1
            try:
    >           assert x == 0
    E           assert 1 == 0

    failure_demo.py:252: AssertionError
    ________________________ TestCustomAssertMsg.test_single_line ________________________

    self = <failure_demo.TestCustomAssertMsg object at 0xdeadbeef>

        def test_single_line(self):
            class A(object):
                a = 1

            b = 2
    >       assert 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.<locals>.A'>.a

    failure_demo.py:263: AssertionError
    _________________________ TestCustomAssertMsg.test_multiline _________________________

    self = <failure_demo.TestCustomAssertMsg object at 0xdeadbeef>

        def test_multiline(self):
            class A(object):
                a = 1

            b = 2
    >       assert (
                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.<locals>.A'>.a

    failure_demo.py:270: AssertionError
    ________________________ TestCustomAssertMsg.test_custom_repr ________________________

    self = <failure_demo.TestCustomAssertMsg object at 0xdeadbeef>

        def test_custom_repr(self):
            class JSON(object):
                a = 1

                def __repr__(self):
                    return "This is JSON\n{\n  'foo': 'bar'\n}"

            a = JSON()
            b = 2
    >       assert a.a == b, a
    E       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
    ============================= 44 failed in 0.12 seconds ==============================