$ tox -e py38
GLOB sdist-make: .../pytest-mock/setup.py
py38 inst-nodeps: .../pytest-mock/.tox/dist/pytest-mock-1.10.3.dev1+g540c17b.zip
py38 installed: atomicwrites==1.3.0,attrs==19.1.0,coverage==4.5.3,more-itertools==7.0.0,pluggy==0.9.0,py==1.8.0,pytest==4.3.1,pytest-mock==1.10.3.dev1+g540c17b,six==1.12.0
py38 run-test-pre: PYTHONHASHSEED='858292126'
py38 runtests: commands[0] | coverage run --append --source=pytest_mock.py -m pytest test_pytest_mock.py
============================= test session starts ==============================
platform linux -- Python 3.8.0a3, pytest-4.3.1, py-1.8.0, pluggy-0.9.0
cachedir: .tox/py38/.pytest_cache
rootdir: .../pytest-mock, inifile: tox.ini
plugins: mock-1.10.3.dev1+g540c17b
collected 49 items

test_pytest_mock.py ...................FFFFF......................F..    [100%]

=================================== FAILURES ===================================
_______________ TestMockerStub.test_failure_message_with_no_name _______________

self = <test_pytest_mock.TestMockerStub object at 0x7fdf51f14e20>
mocker = <pytest_mock.MockFixture object at 0x7fdf51f14100>

    def test_failure_message_with_no_name(self, mocker):
>       self.__test_failure_message(mocker)

test_pytest_mock.py:204: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <test_pytest_mock.TestMockerStub object at 0x7fdf51f14e20>
mocker = <pytest_mock.MockFixture object at 0x7fdf51f14100>, kwargs = {}
expected_name = 'mock', expected_message = 'Expected call: mock()\nNot called'
stub = <MagicMock spec='function' id='140597129200016'>
exc_info = <ExceptionInfo AssertionError tblen=3>
@py_assert2 = AssertionError('expected call not found.\nExpected: mock()\nActual: not called.')
@py_assert4 = 'expected call not found.\nExpected: mock()\nActual: not called.'
@py_assert6 = False

    def __test_failure_message(self, mocker, **kwargs):
        expected_name = kwargs.get("name") or "mock"
        expected_message = "Expected call: {0}()\nNot called".format(expected_name)
        stub = mocker.stub(**kwargs)
        with pytest.raises(AssertionError) as exc_info:
            stub.assert_called_with()
>       assert str(exc_info.value) == expected_message
E       AssertionError: assert 'expected cal...: not called.' == 'Expected call...)\nNot called'
E         - expected call not found.
E         - Expected: mock()
E         + Expected call: mock()
E         ?         +++++
E         - Actual: not called.
E         + Not called

test_pytest_mock.py:201: AssertionError
_____________ TestMockerStub.test_failure_message_with_name[None] ______________

self = <test_pytest_mock.TestMockerStub object at 0x7fdf51f101f0>
mocker = <pytest_mock.MockFixture object at 0x7fdf51f100d0>, name = None

    @pytest.mark.parametrize("name", (None, "", "f", "The Castle of aaarrrrggh"))
    def test_failure_message_with_name(self, mocker, name):
>       self.__test_failure_message(mocker, name=name)

test_pytest_mock.py:208: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <test_pytest_mock.TestMockerStub object at 0x7fdf51f101f0>
mocker = <pytest_mock.MockFixture object at 0x7fdf51f100d0>
kwargs = {'name': None}, expected_name = 'mock'
expected_message = 'Expected call: mock()\nNot called'
stub = <MagicMock spec='function' id='140597129184016'>
exc_info = <ExceptionInfo AssertionError tblen=3>
@py_assert2 = AssertionError('expected call not found.\nExpected: mock()\nActual: not called.')
@py_assert4 = 'expected call not found.\nExpected: mock()\nActual: not called.'
@py_assert6 = False

    def __test_failure_message(self, mocker, **kwargs):
        expected_name = kwargs.get("name") or "mock"
        expected_message = "Expected call: {0}()\nNot called".format(expected_name)
        stub = mocker.stub(**kwargs)
        with pytest.raises(AssertionError) as exc_info:
            stub.assert_called_with()
>       assert str(exc_info.value) == expected_message
E       AssertionError: assert 'expected cal...: not called.' == 'Expected call...)\nNot called'
E         - expected call not found.
E         - Expected: mock()
E         + Expected call: mock()
E         ?         +++++
E         - Actual: not called.
E         + Not called

test_pytest_mock.py:201: AssertionError
_______________ TestMockerStub.test_failure_message_with_name[] ________________

self = <test_pytest_mock.TestMockerStub object at 0x7fdf51f6aa60>
mocker = <pytest_mock.MockFixture object at 0x7fdf51f6adf0>, name = ''

    @pytest.mark.parametrize("name", (None, "", "f", "The Castle of aaarrrrggh"))
    def test_failure_message_with_name(self, mocker, name):
>       self.__test_failure_message(mocker, name=name)

test_pytest_mock.py:208: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <test_pytest_mock.TestMockerStub object at 0x7fdf51f6aa60>
mocker = <pytest_mock.MockFixture object at 0x7fdf51f6adf0>
kwargs = {'name': ''}, expected_name = 'mock'
expected_message = 'Expected call: mock()\nNot called'
stub = <MagicMock spec='function' id='140597129555248'>
exc_info = <ExceptionInfo AssertionError tblen=3>
@py_assert2 = AssertionError('expected call not found.\nExpected: mock()\nActual: not called.')
@py_assert4 = 'expected call not found.\nExpected: mock()\nActual: not called.'
@py_assert6 = False

    def __test_failure_message(self, mocker, **kwargs):
        expected_name = kwargs.get("name") or "mock"
        expected_message = "Expected call: {0}()\nNot called".format(expected_name)
        stub = mocker.stub(**kwargs)
        with pytest.raises(AssertionError) as exc_info:
            stub.assert_called_with()
>       assert str(exc_info.value) == expected_message
E       AssertionError: assert 'expected cal...: not called.' == 'Expected call...)\nNot called'
E         - expected call not found.
E         - Expected: mock()
E         + Expected call: mock()
E         ?         +++++
E         - Actual: not called.
E         + Not called

test_pytest_mock.py:201: AssertionError
_______________ TestMockerStub.test_failure_message_with_name[f] _______________

self = <test_pytest_mock.TestMockerStub object at 0x7fdf51f05ee0>
mocker = <pytest_mock.MockFixture object at 0x7fdf51f05130>, name = 'f'

    @pytest.mark.parametrize("name", (None, "", "f", "The Castle of aaarrrrggh"))
    def test_failure_message_with_name(self, mocker, name):
>       self.__test_failure_message(mocker, name=name)

test_pytest_mock.py:208: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <test_pytest_mock.TestMockerStub object at 0x7fdf51f05ee0>
mocker = <pytest_mock.MockFixture object at 0x7fdf51f05130>
kwargs = {'name': 'f'}, expected_name = 'f'
expected_message = 'Expected call: f()\nNot called'
stub = <MagicMock name='f' spec='function' id='140597129141408'>
exc_info = <ExceptionInfo AssertionError tblen=3>
@py_assert2 = AssertionError('expected call not found.\nExpected: f()\nActual: not called.')
@py_assert4 = 'expected call not found.\nExpected: f()\nActual: not called.'
@py_assert6 = False

    def __test_failure_message(self, mocker, **kwargs):
        expected_name = kwargs.get("name") or "mock"
        expected_message = "Expected call: {0}()\nNot called".format(expected_name)
        stub = mocker.stub(**kwargs)
        with pytest.raises(AssertionError) as exc_info:
            stub.assert_called_with()
>       assert str(exc_info.value) == expected_message
E       AssertionError: assert 'expected cal...: not called.' == 'Expected call...)\nNot called'
E         - expected call not found.
E         - Expected: f()
E         + Expected call: f()
E         ?         +++++
E         - Actual: not called.
E         + Not called

test_pytest_mock.py:201: AssertionError
___ TestMockerStub.test_failure_message_with_name[The Castle of aaarrrrggh] ____

self = <test_pytest_mock.TestMockerStub object at 0x7fdf51f73fa0>
mocker = <pytest_mock.MockFixture object at 0x7fdf51f73b20>
name = 'The Castle of aaarrrrggh'

    @pytest.mark.parametrize("name", (None, "", "f", "The Castle of aaarrrrggh"))
    def test_failure_message_with_name(self, mocker, name):
>       self.__test_failure_message(mocker, name=name)

test_pytest_mock.py:208: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <test_pytest_mock.TestMockerStub object at 0x7fdf51f73fa0>
mocker = <pytest_mock.MockFixture object at 0x7fdf51f73b20>
kwargs = {'name': 'The Castle of aaarrrrggh'}
expected_name = 'The Castle of aaarrrrggh'
expected_message = 'Expected call: The Castle of aaarrrrggh()\nNot called'
stub = <MagicMock name='The Castle of aaarrrrggh' spec='function' id='140597129591536'>
exc_info = <ExceptionInfo AssertionError tblen=3>
@py_assert2 = AssertionError('expected call not found.\nExpected: The Castle of aaarrrrggh()\nActual: not called.')
@py_assert4 = 'expected call not found.\nExpected: The Castle of aaarrrrggh()\nActual: not called.'
@py_assert6 = False

    def __test_failure_message(self, mocker, **kwargs):
        expected_name = kwargs.get("name") or "mock"
        expected_message = "Expected call: {0}()\nNot called".format(expected_name)
        stub = mocker.stub(**kwargs)
        with pytest.raises(AssertionError) as exc_info:
            stub.assert_called_with()
>       assert str(exc_info.value) == expected_message
E       AssertionError: assert 'expected cal...: not called.' == 'Expected call...)\nNot called'
E         - expected call not found.
E         - Expected: The Castle of aaarrrrggh()
E         + Expected call: The Castle of aaarrrrggh()
E         ?         +++++
E         - Actual: not called.
E         + Not called

test_pytest_mock.py:201: AssertionError
_________________________ test_detailed_introspection __________________________

testdir = <Testdir local('/tmp/pytest-of-churchyard/pytest-2/test_detailed_introspection0')>

    @pytest.mark.usefixtures("needs_assert_rewrite")
    def test_detailed_introspection(testdir):
        """Check that the "mock_use_standalone" is being used.
        """
        testdir.makepyfile(
            """
            def test(mocker):
                m = mocker.Mock()
                m('fo')
                m.assert_called_once_with('', bar=4)
        """
        )
        result = testdir.runpytest("-s")
>       result.stdout.fnmatch_lines(
            [
                "*AssertionError: Expected call: mock('', bar=4)*",
                "*Actual call: mock('fo')*",
                "*pytest introspection follows:*",
                "*Args:",
                "*assert ('fo',) == ('',)",
                "*At index 0 diff: 'fo' != ''*",
                "*Use -v to get the full diff*",
                "*Kwargs:*",
                "*assert {} == {'bar': 4}*",
                "*Right contains more items:*",
                "*{'bar': 4}*",
                "*Use -v to get the full diff*",
            ]
        )
E       Failed: nomatch: "*AssertionError: Expected call: mock('', bar=4)*"
E           and: '============================= test session starts =============================='
E           and: 'platform linux -- Python 3.8.0a3, pytest-4.3.1, py-1.8.0, pluggy-0.9.0'
E           and: 'rootdir: /tmp/pytest-of-churchyard/pytest-2/test_detailed_introspection0, inifile:'
E           and: 'plugins: mock-1.10.3.dev1+g540c17b'
E           and: 'collected 1 item'
E           and: ''
E           and: 'test_detailed_introspection.py F'
E           and: ''
E           and: '=================================== FAILURES ==================================='
E           and: '_____________________________________ test _____________________________________'
E           and: ''
E           and: 'mocker = <pytest_mock.MockFixture object at 0x7fdf51e08160>'
E           and: ''
E           and: '    def test(mocker):'
E           and: '        m = mocker.Mock()'
E           and: "        m('fo')"
E           and: ">       m.assert_called_once_with('', bar=4)"
E           and: 'E       AssertionError: expected call not found.'
E           and: "E       Expected: mock('', bar=4)"
E           and: "E       Actual: mock('fo')"
E           and: 'E       '
E           and: 'E       pytest introspection follows:'
E           and: 'E       '
E           and: 'E       Args:'
E           and: "E       assert ('fo',) == ('',)"
E           and: "E         At index 0 diff: 'fo' != ''"
E           and: 'E         Use -v to get the full diff'
E           and: 'E       Kwargs:'
E           and: "E       assert {} == {'bar': 4}"
E           and: 'E         Right contains more items:'
E           and: "E         {'bar': 4}"
E           and: 'E         Use -v to get the full diff'
E           and: ''
E           and: 'test_detailed_introspection.py:4: AssertionError'
E           and: '=========================== 1 failed in 0.01 seconds ==========================='
E           and: ''
E       remains unmatched: "*AssertionError: Expected call: mock('', bar=4)*"

.../pytest-mock/test_pytest_mock.py:588: Failed
----------------------------- Captured stdout call -----------------------------
============================= test session starts ==============================
platform linux -- Python 3.8.0a3, pytest-4.3.1, py-1.8.0, pluggy-0.9.0
rootdir: /tmp/pytest-of-churchyard/pytest-2/test_detailed_introspection0, inifile:
plugins: mock-1.10.3.dev1+g540c17b
collected 1 item

test_detailed_introspection.py F

=================================== FAILURES ===================================
_____________________________________ test _____________________________________

mocker = <pytest_mock.MockFixture object at 0x7fdf51e08160>

    def test(mocker):
        m = mocker.Mock()
        m('fo')
>       m.assert_called_once_with('', bar=4)
E       AssertionError: expected call not found.
E       Expected: mock('', bar=4)
E       Actual: mock('fo')
E       
E       pytest introspection follows:
E       
E       Args:
E       assert ('fo',) == ('',)
E         At index 0 diff: 'fo' != ''
E         Use -v to get the full diff
E       Kwargs:
E       assert {} == {'bar': 4}
E         Right contains more items:
E         {'bar': 4}
E         Use -v to get the full diff

test_detailed_introspection.py:4: AssertionError
=========================== 1 failed in 0.01 seconds ===========================
=============================== warnings summary ===============================
test_pytest_mock.py::test_deprecated_mock
  .../pytest-mock/pytest_mock.py:179: DeprecationWarning: "mock" fixture has been deprecated, use "mocker" instead
    warnings.warn(

-- Docs: https://docs.pytest.org/en/latest/warnings.html
=========================== short test summary info ============================
FAILED test_pytest_mock.py::TestMockerStub::test_failure_message_with_no_name
FAILED test_pytest_mock.py::TestMockerStub::test_failure_message_with_name[None]
FAILED test_pytest_mock.py::TestMockerStub::test_failure_message_with_name[]
FAILED test_pytest_mock.py::TestMockerStub::test_failure_message_with_name[f]
FAILED test_pytest_mock.py::TestMockerStub::test_failure_message_with_name[The Castle of aaarrrrggh]
FAILED test_pytest_mock.py::test_detailed_introspection
=============== 6 failed, 43 passed, 1 warnings in 1.41 seconds ================
Coverage.py warning: Module pytest_mock.py was never imported. (module-not-imported)
Coverage.py warning: No data was collected. (no-data-collected)
ERROR: InvocationError for command '.../pytest-mock/.tox/py38/bin/coverage run --append --source=pytest_mock.py -m pytest test_pytest_mock.py' (exited with code 1)
___________________________________ summary ____________________________________
ERROR:   py38: commands failed