test_ok2/testing/test_warnings.py

import pytest


WARNINGS_SUMMARY_HEADER = 'warnings summary'

@pytest.fixture
def pyfile_with_warnings(testdir):
    testdir.makepyfile('''
        import warnings
        def test_func():
            warnings.warn(PendingDeprecationWarning("functionality is pending deprecation"))
            warnings.warn(DeprecationWarning("functionality is deprecated"))
    ''')


def test_normal_flow(testdir, pyfile_with_warnings):
    result = testdir.runpytest()
    result.stdout.fnmatch_lines([
        '*== %s ==*' % WARNINGS_SUMMARY_HEADER,

        '*test_normal_flow.py:3: PendingDeprecationWarning: functionality is pending deprecation',
        '  warnings.warn(PendingDeprecationWarning("functionality is pending deprecation"))',

        '*test_normal_flow.py:4: DeprecationWarning: functionality is deprecated',
        '  warnings.warn(DeprecationWarning("functionality is deprecated"))',
        '* 1 passed, 2 warnings*',
    ])


def test_setup_teardown_warnings(testdir, pyfile_with_warnings):
    testdir.makepyfile('''
        import warnings
        import pytest

        @pytest.fixture
        def fix():
            warnings.warn(UserWarning("warning during setup"))
            yield
            warnings.warn(UserWarning("warning during teardown"))

        def test_func(fix):
            pass
    ''')
    result = testdir.runpytest()
    result.stdout.fnmatch_lines([
        '*== %s ==*' % WARNINGS_SUMMARY_HEADER,

        '*test_setup_teardown_warnings.py:6: UserWarning: warning during setup',
        '  warnings.warn(UserWarning("warning during setup"))',

        '*test_setup_teardown_warnings.py:8: UserWarning: warning during teardown',
        '  warnings.warn(UserWarning("warning during teardown"))',
        '* 1 passed, 2 warnings*',
    ])



@pytest.mark.parametrize('method', ['cmdline', 'ini'])
def test_as_errors(testdir, pyfile_with_warnings, method):
    args = ('-W', 'error') if method == 'cmdline' else ()
    if method == 'ini':
        testdir.makeini('''
            [pytest]
            filterwarnings= error
            ''')
    result = testdir.runpytest(*args)
    result.stdout.fnmatch_lines([
        'E       PendingDeprecationWarning: functionality is pending deprecation',
        'test_as_errors.py:3: PendingDeprecationWarning',
        '* 1 failed in *',
    ])


@pytest.mark.parametrize('method', ['cmdline', 'ini'])
def test_ignore(testdir, pyfile_with_warnings, method):
    args = ('-W', 'ignore') if method == 'cmdline' else ()
    if method == 'ini':
        testdir.makeini('''
        [pytest]
        filterwarnings= ignore
        ''')

    result = testdir.runpytest(*args)
    result.stdout.fnmatch_lines([
        '* 1 passed in *',
    ])
    assert WARNINGS_SUMMARY_HEADER not in result.stdout.str()