How to use expected_regex method in Playwright Python

Best Python code snippet using playwright-python

base.py

Source:base.py

1from __future__ import print_function, absolute_import2import os3import tempfile4import unittest5import sys6import re7import warnings8import io9from textwrap import dedent10from future.utils import bind_method, PY26, PY3, PY2, PY2711from future.moves.subprocess import check_output, STDOUT, CalledProcessError12if PY26:13    import unittest2 as unittest14def reformat_code(code):15    """16    Removes any leading \n and dedents.17    """18    if code.startswith('\n'):19        code = code[1:]20    return dedent(code)21def order_future_lines(code):22    """23    Returns the code block with any ``__future__`` import lines sorted, and24    then any ``future`` import lines sorted, then any ``builtins`` import lines25    sorted.26    This only sorts the lines within the expected blocks.27    See test_order_future_lines() for an example.28    """29    # We need .splitlines(keepends=True), which doesn't exist on Py2,30    # so we use this instead:31    lines = code.split('\n')32    uufuture_line_numbers = [i for i, line in enumerate(lines)33                               if line.startswith('from __future__ import ')]34    future_line_numbers = [i for i, line in enumerate(lines)35                             if line.startswith('from future')36                             or line.startswith('from past')]37    builtins_line_numbers = [i for i, line in enumerate(lines)38                             if line.startswith('from builtins')]39    assert code.lstrip() == code, ('internal usage error: '40            'dedent the code before calling order_future_lines()')41    def mymax(numbers):42        return max(numbers) if len(numbers) > 0 else 043    def mymin(numbers):44        return min(numbers) if len(numbers) > 0 else float('inf')45    assert mymax(uufuture_line_numbers) <= mymin(future_line_numbers), \46            'the __future__ and future imports are out of order'47    # assert mymax(future_line_numbers) <= mymin(builtins_line_numbers), \48    #         'the future and builtins imports are out of order'49    uul = sorted([lines[i] for i in uufuture_line_numbers])50    sorted_uufuture_lines = dict(zip(uufuture_line_numbers, uul))51    fl = sorted([lines[i] for i in future_line_numbers])52    sorted_future_lines = dict(zip(future_line_numbers, fl))53    bl = sorted([lines[i] for i in builtins_line_numbers])54    sorted_builtins_lines = dict(zip(builtins_line_numbers, bl))55    # Replace the old unsorted "from __future__ import ..." lines with the56    # new sorted ones:57    new_lines = []58    for i in range(len(lines)):59        if i in uufuture_line_numbers:60            new_lines.append(sorted_uufuture_lines[i])61        elif i in future_line_numbers:62            new_lines.append(sorted_future_lines[i])63        elif i in builtins_line_numbers:64            new_lines.append(sorted_builtins_lines[i])65        else:66            new_lines.append(lines[i])67    return '\n'.join(new_lines)68class VerboseCalledProcessError(CalledProcessError):69    """70    Like CalledProcessError, but it displays more information (message and71    script output) for diagnosing test failures etc.72    """73    def __init__(self, msg, returncode, cmd, output=None):74        self.msg = msg75        self.returncode = returncode76        self.cmd = cmd77        self.output = output78    def __str__(self):79        return ("Command '%s' failed with exit status %d\nMessage: %s\nOutput: %s"80                % (self.cmd, self.returncode, self.msg, self.output))81class FuturizeError(VerboseCalledProcessError):82    pass83class PasteurizeError(VerboseCalledProcessError):84    pass85class CodeHandler(unittest.TestCase):86    """87    Handy mixin for test classes for writing / reading / futurizing /88    running .py files in the test suite.89    """90    def setUp(self):91        """92        The outputs from the various futurize stages should have the93        following headers:94        """95        # After stage1:96        # TODO: use this form after implementing a fixer to consolidate97        #       __future__ imports into a single line:98        # self.headers1 = """99        # from __future__ import absolute_import, division, print_function100        # """101        self.headers1 = reformat_code("""102        from __future__ import absolute_import103        from __future__ import division104        from __future__ import print_function105        """)106        # After stage2 --all-imports:107        # TODO: use this form after implementing a fixer to consolidate108        #       __future__ imports into a single line:109        # self.headers2 = """110        # from __future__ import (absolute_import, division,111        #                         print_function, unicode_literals)112        # from future import standard_library113        # from future.builtins import *114        # """115        self.headers2 = reformat_code("""116        from __future__ import absolute_import117        from __future__ import division118        from __future__ import print_function119        from __future__ import unicode_literals120        from future import standard_library121        standard_library.install_aliases()122        from builtins import *123        """)124        self.interpreters = [sys.executable]125        self.tempdir = tempfile.mkdtemp() + os.path.sep126        pypath = os.getenv('PYTHONPATH')127        if pypath:128            self.env = {'PYTHONPATH': os.getcwd() + os.pathsep + pypath}129        else:130            self.env = {'PYTHONPATH': os.getcwd()}131    def convert(self, code, stages=(1, 2), all_imports=False, from3=False,132                reformat=True, run=True, conservative=False):133        """134        Converts the code block using ``futurize`` and returns the135        resulting code.136        Passing stages=[1] or stages=[2] passes the flag ``--stage1`` or137        ``stage2`` to ``futurize``. Passing both stages runs ``futurize``138        with both stages by default.139        If from3 is False, runs ``futurize``, converting from Python 2 to140        both 2 and 3. If from3 is True, runs ``pasteurize`` to convert141        from Python 3 to both 2 and 3.142        Optionally reformats the code block first using the reformat() function.143        If run is True, runs the resulting code under all Python144        interpreters in self.interpreters.145        """146        if reformat:147            code = reformat_code(code)148        self._write_test_script(code)149        self._futurize_test_script(stages=stages, all_imports=all_imports,150                                   from3=from3, conservative=conservative)151        output = self._read_test_script()152        if run:153            for interpreter in self.interpreters:154                _ = self._run_test_script(interpreter=interpreter)155        return output156    def compare(self, output, expected, ignore_imports=True):157        """158        Compares whether the code blocks are equal. If not, raises an159        exception so the test fails. Ignores any trailing whitespace like160        blank lines.161        If ignore_imports is True, passes the code blocks into the162        strip_future_imports method.163        If one code block is a unicode string and the other a164        byte-string, it assumes the byte-string is encoded as utf-8.165        """166        if ignore_imports:167            output = self.strip_future_imports(output)168            expected = self.strip_future_imports(expected)169        if isinstance(output, bytes) and not isinstance(expected, bytes):170            output = output.decode('utf-8')171        if isinstance(expected, bytes) and not isinstance(output, bytes):172            expected = expected.decode('utf-8')173        self.assertEqual(order_future_lines(output.rstrip()),174                         expected.rstrip())175    def strip_future_imports(self, code):176        """177        Strips any of these import lines:178            from __future__ import <anything>179            from future <anything>180            from future.<anything>181            from builtins <anything>182        or any line containing:183            install_hooks()184        or:185            install_aliases()186        Limitation: doesn't handle imports split across multiple lines like187        this:188            from __future__ import (absolute_import, division, print_function,189                                    unicode_literals)190        """191        output = []192        # We need .splitlines(keepends=True), which doesn't exist on Py2,193        # so we use this instead:194        for line in code.split('\n'):195            if not (line.startswith('from __future__ import ')196                    or line.startswith('from future ')197                    or line.startswith('from builtins ')198                    or 'install_hooks()' in line199                    or 'install_aliases()' in line200                    # but don't match "from future_builtins" :)201                    or line.startswith('from future.')):202                output.append(line)203        return '\n'.join(output)204    def convert_check(self, before, expected, stages=(1, 2), all_imports=False,205                      ignore_imports=True, from3=False, run=True,206                      conservative=False):207        """208        Convenience method that calls convert() and compare().209        Reformats the code blocks automatically using the reformat_code()210        function.211        If all_imports is passed, we add the appropriate import headers212        for the stage(s) selected to the ``expected`` code-block, so they213        needn't appear repeatedly in the test code.214        If ignore_imports is True, ignores the presence of any lines215        beginning:216            from __future__ import ...217            from future import ...218        for the purpose of the comparison.219        """220        output = self.convert(before, stages=stages, all_imports=all_imports,221                              from3=from3, run=run, conservative=conservative)222        if all_imports:223            headers = self.headers2 if 2 in stages else self.headers1224        else:225            headers = ''226        reformatted = reformat_code(expected)227        if headers in reformatted:228            headers = ''229        self.compare(output, headers + reformatted,230                     ignore_imports=ignore_imports)231    def unchanged(self, code, **kwargs):232        """233        Convenience method to ensure the code is unchanged by the234        futurize process.235        """236        self.convert_check(code, code, **kwargs)237    def _write_test_script(self, code, filename='mytestscript.py'):238        """239        Dedents the given code (a multiline string) and writes it out to240        a file in a temporary folder like /tmp/tmpUDCn7x/mytestscript.py.241        """242        if isinstance(code, bytes):243            code = code.decode('utf-8')244        # Be explicit about encoding the temp file as UTF-8 (issue #63):245        with io.open(self.tempdir + filename, 'wt', encoding='utf-8') as f:246            f.write(dedent(code))247    def _read_test_script(self, filename='mytestscript.py'):248        with io.open(self.tempdir + filename, 'rt', encoding='utf-8') as f:249            newsource = f.read()250        return newsource251    def _futurize_test_script(self, filename='mytestscript.py', stages=(1, 2),252                              all_imports=False, from3=False,253                              conservative=False):254        params = []255        stages = list(stages)256        if all_imports:257            params.append('--all-imports')258        if from3:259            script = 'pasteurize.py'260        else:261            script = 'futurize.py'262            if stages == [1]:263                params.append('--stage1')264            elif stages == [2]:265                params.append('--stage2')266            else:267                assert stages == [1, 2]268            if conservative:269                params.append('--conservative')270            # No extra params needed271        # Absolute file path:272        fn = self.tempdir + filename273        call_args = [sys.executable, script] + params + ['-w', fn]274        try:275            output = check_output(call_args, stderr=STDOUT, env=self.env)276        except CalledProcessError as e:277            with open(fn) as f:278                msg = (279                    'Error running the command %s\n'280                    '%s\n'281                    'Contents of file %s:\n'282                    '\n'283                    '%s') % (284                        ' '.join(call_args),285                        'env=%s' % self.env,286                        fn,287                        '----\n%s\n----' % f.read(),288                    )289            ErrorClass = (FuturizeError if 'futurize' in script else PasteurizeError)290            if not hasattr(e, 'output'):291                # The attribute CalledProcessError.output doesn't exist on Py2.6292                e.output = None293            raise ErrorClass(msg, e.returncode, e.cmd, output=e.output)294        return output295    def _run_test_script(self, filename='mytestscript.py',296                         interpreter=sys.executable):297        # Absolute file path:298        fn = self.tempdir + filename299        try:300            output = check_output([interpreter, fn],301                                  env=self.env, stderr=STDOUT)302        except CalledProcessError as e:303            with open(fn) as f:304                msg = (305                    'Error running the command %s\n'306                    '%s\n'307                    'Contents of file %s:\n'308                    '\n'309                    '%s') % (310                        ' '.join([interpreter, fn]),311                        'env=%s' % self.env,312                        fn,313                        '----\n%s\n----' % f.read(),314                    )315            if not hasattr(e, 'output'):316                # The attribute CalledProcessError.output doesn't exist on Py2.6317                e.output = None318            raise VerboseCalledProcessError(msg, e.returncode, e.cmd, output=e.output)319        return output320# Decorator to skip some tests on Python 2.6 ...321skip26 = unittest.skipIf(PY26, "this test is known to fail on Py2.6")322def expectedFailurePY3(func):323    if not PY3:324        return func325    return unittest.expectedFailure(func)326def expectedFailurePY26(func):327    if not PY26:328        return func329    return unittest.expectedFailure(func)330def expectedFailurePY27(func):331    if not PY27:332        return func333    return unittest.expectedFailure(func)334def expectedFailurePY2(func):335    if not PY2:336        return func337    return unittest.expectedFailure(func)338# Renamed in Py3.3:339if not hasattr(unittest.TestCase, 'assertRaisesRegex'):340    unittest.TestCase.assertRaisesRegex = unittest.TestCase.assertRaisesRegexp341# From Py3.3:342def assertRegex(self, text, expected_regex, msg=None):343    """Fail the test unless the text matches the regular expression."""344    if isinstance(expected_regex, (str, unicode)):345        assert expected_regex, "expected_regex must not be empty."346        expected_regex = re.compile(expected_regex)347    if not expected_regex.search(text):348        msg = msg or "Regex didn't match"349        msg = '%s: %r not found in %r' % (msg, expected_regex.pattern, text)350        raise self.failureException(msg)351if not hasattr(unittest.TestCase, 'assertRegex'):352    bind_method(unittest.TestCase, 'assertRegex', assertRegex)353class _AssertRaisesBaseContext(object):354    def __init__(self, expected, test_case, callable_obj=None,355                 expected_regex=None):356        self.expected = expected357        self.test_case = test_case358        if callable_obj is not None:359            try:360                self.obj_name = callable_obj.__name__361            except AttributeError:362                self.obj_name = str(callable_obj)363        else:364            self.obj_name = None365        if isinstance(expected_regex, (bytes, str)):366            expected_regex = re.compile(expected_regex)367        self.expected_regex = expected_regex368        self.msg = None369    def _raiseFailure(self, standardMsg):370        msg = self.test_case._formatMessage(self.msg, standardMsg)371        raise self.test_case.failureException(msg)372    def handle(self, name, callable_obj, args, kwargs):373        """374        If callable_obj is None, assertRaises/Warns is being used as a375        context manager, so check for a 'msg' kwarg and return self.376        If callable_obj is not None, call it passing args and kwargs.377        """378        if callable_obj is None:379            self.msg = kwargs.pop('msg', None)380            return self381        with self:382            callable_obj(*args, **kwargs)383class _AssertWarnsContext(_AssertRaisesBaseContext):384    """A context manager used to implement TestCase.assertWarns* methods."""385    def __enter__(self):386        # The __warningregistry__'s need to be in a pristine state for tests387        # to work properly.388        for v in sys.modules.values():389            if getattr(v, '__warningregistry__', None):390                v.__warningregistry__ = {}391        self.warnings_manager = warnings.catch_warnings(record=True)392        self.warnings = self.warnings_manager.__enter__()393        warnings.simplefilter("always", self.expected)394        return self395    def __exit__(self, exc_type, exc_value, tb):396        self.warnings_manager.__exit__(exc_type, exc_value, tb)397        if exc_type is not None:398            # let unexpected exceptions pass through399            return400        try:401            exc_name = self.expected.__name__402        except AttributeError:403            exc_name = str(self.expected)404        first_matching = None405        for m in self.warnings:406            w = m.message407            if not isinstance(w, self.expected):408                continue409            if first_matching is None:410                first_matching = w411            if (self.expected_regex is not None and412                not self.expected_regex.search(str(w))):413                continue414            # store warning for later retrieval415            self.warning = w416            self.filename = m.filename417            self.lineno = m.lineno418            return419        # Now we simply try to choose a helpful failure message420        if first_matching is not None:421            self._raiseFailure('"{}" does not match "{}"'.format(422                     self.expected_regex.pattern, str(first_matching)))423        if self.obj_name:424            self._raiseFailure("{} not triggered by {}".format(exc_name,425                                                               self.obj_name))426        else:427            self._raiseFailure("{} not triggered".format(exc_name))428def assertWarns(self, expected_warning, callable_obj=None, *args, **kwargs):429    """Fail unless a warning of class warnClass is triggered430       by callable_obj when invoked with arguments args and keyword431       arguments kwargs.  If a different type of warning is432       triggered, it will not be handled: depending on the other433       warning filtering rules in effect, it might be silenced, printed434       out, or raised as an exception.435       If called with callable_obj omitted or None, will return a436       context object used like this::437            with self.assertWarns(SomeWarning):438                do_something()439       An optional keyword argument 'msg' can be provided when assertWarns440       is used as a context object.441       The context manager keeps a reference to the first matching442       warning as the 'warning' attribute; similarly, the 'filename'443       and 'lineno' attributes give you information about the line444       of Python code from which the warning was triggered.445       This allows you to inspect the warning after the assertion::446           with self.assertWarns(SomeWarning) as cm:447               do_something()448           the_warning = cm.warning449           self.assertEqual(the_warning.some_attribute, 147)450    """451    context = _AssertWarnsContext(expected_warning, self, callable_obj)452    return context.handle('assertWarns', callable_obj, args, kwargs)453if not hasattr(unittest.TestCase, 'assertWarns'):...

case.py

Source:case.py

1from __future__ import absolute_import, unicode_literals2import re3import sys4import types5import warnings6from contextlib import contextmanager7from functools import partial8from six import string_types, itervalues as values, iteritems as items9from . import mock10try:11    import unittest  # noqa12    unittest.skip13    from unittest.util import safe_repr, unorderable_list_difference14except AttributeError:15    import unittest2 as unittest  # noqa16    from unittest2.util import safe_repr, unorderable_list_difference  # noqa17__all__ = ['Case']18# -- adds assertWarns from recent unittest2, not in Python 2.7.19class _AssertRaisesBaseContext(object):20    def __init__(self, expected, test_case, callable_obj=None,21                 expected_regex=None):22        self.expected = expected23        self.failureException = test_case.failureException24        self.obj_name = None25        if isinstance(expected_regex, string_types):26            expected_regex = re.compile(expected_regex)27        self.expected_regex = expected_regex28def _is_magic_module(m):29    # some libraries create custom module types that are lazily30    # lodaded, e.g. Django installs some modules in sys.modules that31    # will load _tkinter and other shit when touched.32    # pyflakes refuses to accept 'noqa' for this isinstance.33    cls, modtype = type(m), types.ModuleType34    try:35        variables = vars(cls)36    except TypeError:37        return True38    else:39        return (cls is not modtype and (40            '__getattr__' in variables or41            '__getattribute__' in variables))42class _AssertWarnsContext(_AssertRaisesBaseContext):43    """A context manager used to implement TestCase.assertWarns* methods."""44    def __enter__(self):45        # The __warningregistry__'s need to be in a pristine state for tests46        # to work properly.47        warnings.resetwarnings()48        for v in list(values(sys.modules)):49            # do not evaluate Django moved modules and other lazily50            # initialized modules.51            if v and not _is_magic_module(v):52                # use raw __getattribute__ to protect even better from53                # lazily loaded modules54                try:55                    object.__getattribute__(v, '__warningregistry__')56                except AttributeError:57                    pass58                else:59                    object.__setattr__(v, '__warningregistry__', {})60        self.warnings_manager = warnings.catch_warnings(record=True)61        self.warnings = self.warnings_manager.__enter__()62        warnings.simplefilter('always', self.expected)63        return self64    def __exit__(self, exc_type, exc_value, tb):65        self.warnings_manager.__exit__(exc_type, exc_value, tb)66        if exc_type is not None:67            # let unexpected exceptions pass through68            return69        try:70            exc_name = self.expected.__name__71        except AttributeError:72            exc_name = str(self.expected)73        first_matching = None74        for m in self.warnings:75            w = m.message76            if not isinstance(w, self.expected):77                continue78            if first_matching is None:79                first_matching = w80            if (self.expected_regex is not None and81                    not self.expected_regex.search(str(w))):82                continue83            # store warning for later retrieval84            self.warning = w85            self.filename = m.filename86            self.lineno = m.lineno87            return88        # Now we simply try to choose a helpful failure message89        if first_matching is not None:90            raise self.failureException(91                '%r does not match %r' % (92                    self.expected_regex.pattern, str(first_matching)))93        if self.obj_name:94            raise self.failureException(95                '%s not triggered by %s' % (exc_name, self.obj_name))96        else:97            raise self.failureException('%s not triggered' % exc_name)98class CaseMixin(object):99    """Mixin class that adds the utility methods to any unittest TestCase100    class."""101    def patch(self, *path, **options):102        """Patch object until test case returns.103        Example::104            from case import Case105            class test_Frobulator(Case):106                def setup(self):107                    frobulate = self.patch('some.where.Frobulator.frobulate')108        """109        manager = mock.patch('.'.join(path), **options)110        patched = manager.start()111        self.addCleanup(manager.stop)112        return patched113    def mock_modules(self, *mods):114        """Mock modules for the duration of the test.115        See :func:`case.mock.module`116        """117        modules = []118        for mod in mods:119            mod = mod.split('.')120            modules.extend(reversed([121                '.'.join(mod[:-i] if i else mod) for i in range(len(mod))122            ]))123        modules = sorted(set(modules))124        return self.wrap_context(mock.module(*modules))125    def mask_modules(self, *modules):126        """Make modules for the duration of the test.127        See :func:`case.mock.mask_modules`.128        """129        self.wrap_context(mock.mask_modules(*modules))130    def wrap_context(self, context):131        """Wrap context so that the context exits when the test completes."""132        ret = context.__enter__()133        self.addCleanup(partial(context.__exit__, None, None, None))134        return ret135    def mock_environ(self, env_name, env_value):136        """Mock environment variable value for the duration of the test.137        See :func:`case.mock.environ`.138        """139        return self.wrap_context(mock.environ(env_name, env_value))140class Case(unittest.TestCase, CaseMixin):141    """Test Case142    Subclass of :class:`unittest.TestCase` adding convenience143    methods.144    **setup / teardown**145    New :meth:`setup` and :meth:`teardown` methods can be defined146    in addition to the core :meth:`setUp` + :meth:`tearDown`147    methods.148    Note: If you redefine the core :meth:`setUp` + :meth:`tearDown`149          methods you must make sure ``super`` is called.150          ``super`` is not necessary for the lowercase versions.151    **Python 2.6 compatibility**152    This class also implements :meth:`assertWarns`, :meth:`assertWarnsRegex`,153    :meth:`assertDictContainsSubset`, and :meth:`assertItemsEqual`154    which are not available in the original Python 2.6 unittest155    implementation.156    """157    DeprecationWarning = DeprecationWarning158    PendingDeprecationWarning = PendingDeprecationWarning159    def setUp(self):160        self.setup()161    def tearDown(self):162        self.teardown()163    def setup(self):164        pass165    def teardown(self):166        pass167    def assertWarns(self, expected_warning):168        return _AssertWarnsContext(expected_warning, self, None)169    def assertWarnsRegex(self, expected_warning, expected_regex):170        return _AssertWarnsContext(expected_warning, self,171                                   None, expected_regex)172    @contextmanager173    def assertDeprecated(self):174        with self.assertWarnsRegex(self.DeprecationWarning,175                                   r'scheduled for removal'):176            yield177    @contextmanager178    def assertPendingDeprecation(self):179        with self.assertWarnsRegex(self.PendingDeprecationWarning,180                                   r'scheduled for deprecation'):181            yield182    def assertDictContainsSubset(self, expected, actual, msg=None):183        missing, mismatched = [], []184        for key, value in items(expected):185            if key not in actual:186                missing.append(key)187            elif value != actual[key]:188                mismatched.append('%s, expected: %s, actual: %s' % (189                    safe_repr(key), safe_repr(value),190                    safe_repr(actual[key])))191        if not (missing or mismatched):192            return193        standard_msg = ''194        if missing:195            standard_msg = 'Missing: %s' % ','.join(map(safe_repr, missing))196        if mismatched:197            if standard_msg:198                standard_msg += '; '199            standard_msg += 'Mismatched values: %s' % (200                ','.join(mismatched))201        self.fail(self._formatMessage(msg, standard_msg))202    def assertItemsEqual(self, expected_seq, actual_seq, msg=None):203        missing = unexpected = None204        try:205            expected = sorted(expected_seq)206            actual = sorted(actual_seq)207        except TypeError:208            # Unsortable items (example: set(), complex(), ...)209            expected = list(expected_seq)210            actual = list(actual_seq)211            missing, unexpected = unorderable_list_difference(212                expected, actual)213        else:214            return self.assertSequenceEqual(expected, actual, msg=msg)215        errors = []216        if missing:217            errors.append(218                'Expected, but missing:\n    %s' % (safe_repr(missing),)219            )220        if unexpected:221            errors.append(222                'Unexpected, but present:\n    %s' % (safe_repr(unexpected),)223            )224        if errors:225            standardMsg = '\n'.join(errors)...

_unittest_backport.py

Source:_unittest_backport.py

1"""2This is a backport of assertRaises() and assertRaisesRegex from Python 3.5.43The original copyright message is as follows4Python unit testing framework, based on Erich Gamma's JUnit and Kent Beck's5Smalltalk testing framework (used with permission).6This module contains the core framework classes that form the basis of7specific test cases and suites (TestCase, TestSuite etc.), and also a8text-based utility class for running the tests and reporting the results9 (TextTestRunner).10Simple usage:11    import unittest12    class IntegerArithmeticTestCase(unittest.TestCase):13        def testAdd(self):  # test method names begin with 'test'14            self.assertEqual((1 + 2), 3)15            self.assertEqual(0 + 1, 1)16        def testMultiply(self):17            self.assertEqual((0 * 10), 0)18            self.assertEqual((5 * 8), 40)19    if __name__ == '__main__':20        unittest.main()21Further information is available in the bundled documentation, and from22  http://docs.python.org/library/unittest.html23Copyright (c) 1999-2003 Steve Purcell24Copyright (c) 2003-2010 Python Software Foundation25This module is free software, and you may redistribute it and/or modify26it under the same terms as Python itself, so long as this copyright message27and disclaimer are retained in their original form.28IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,29SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF30THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH31DAMAGE.32THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT33LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A34PARTICULAR PURPOSE.  THE CODE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS,35AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,36SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.37"""38import re39import warnings40import unittest41def _is_subtype(expected, basetype):42    if isinstance(expected, tuple):43        return all(_is_subtype(e, basetype) for e in expected)44    return isinstance(expected, type) and issubclass(expected, basetype)45class _BaseTestCaseContext:46    def __init__(self, test_case):47        self.test_case = test_case48    def _raiseFailure(self, standardMsg):49        msg = self.test_case._formatMessage(self.msg, standardMsg)50        raise self.test_case.failureException(msg)51class _AssertRaisesBaseContext(_BaseTestCaseContext):52    def __init__(self, expected, test_case, expected_regex=None):53        _BaseTestCaseContext.__init__(self, test_case)54        self.expected = expected55        self.test_case = test_case56        if expected_regex is not None:57            expected_regex = re.compile(expected_regex)58        self.expected_regex = expected_regex59        self.obj_name = None60        self.msg = None61    def handle(self, name, args, kwargs):62        """63        If args is empty, assertRaises/Warns is being used as a64        context manager, so check for a 'msg' kwarg and return self.65        If args is not empty, call a callable passing positional and keyword66        arguments.67        """68        try:69            if not _is_subtype(self.expected, self._base_type):70                raise TypeError('%s() arg 1 must be %s' %71                                (name, self._base_type_str))72            if args and args[0] is None:73                warnings.warn("callable is None",74                              DeprecationWarning, 3)75                args = ()76            if not args:77                self.msg = kwargs.pop('msg', None)78                if kwargs:79                    warnings.warn('%r is an invalid keyword argument for '80                                  'this function' % next(iter(kwargs)),81                                  DeprecationWarning, 3)82                return self83            callable_obj, args = args[0], args[1:]84            try:85                self.obj_name = callable_obj.__name__86            except AttributeError:87                self.obj_name = str(callable_obj)88            with self:89                callable_obj(*args, **kwargs)90        finally:91            # bpo-23890: manually break a reference cycle92            self = None93class _AssertRaisesContext(_AssertRaisesBaseContext):94    """A context manager used to implement TestCase.assertRaises* methods."""95    _base_type = BaseException96    _base_type_str = 'an exception type or tuple of exception types'97    def __enter__(self):98        return self99    def __exit__(self, exc_type, exc_value, tb):100        if exc_type is None:101            try:102                exc_name = self.expected.__name__103            except AttributeError:104                exc_name = str(self.expected)105            if self.obj_name:106                self._raiseFailure("{} not raised by {}".format(exc_name,107                                                                self.obj_name))108            else:109                self._raiseFailure("{} not raised".format(exc_name))110        if not issubclass(exc_type, self.expected):111            return False112        if self.expected_regex is None:113            return True114        expected_regex = self.expected_regex115        if not expected_regex.search(str(exc_value)):116            self._raiseFailure('"{}" does not match "{}"'.format(117                expected_regex.pattern, str(exc_value)))118        return True119class TestCase(unittest.TestCase):120    longMessage = True121    failureException = AssertionError122    def _formatMessage(self, msg, standardMsg):123        """Honour the longMessage attribute when generating failure messages.124        If longMessage is False this means:125        * Use only an explicit message if it is provided126        * Otherwise use the standard message for the assert127        If longMessage is True:128        * Use the standard message129        * If an explicit message is provided, plus ' : ' and the explicit msg130        """131        if not self.longMessage:132            return msg or standardMsg133        if msg is None:134            return standardMsg135        try:136            # don't switch to '{}' formatting in Python 2.X137            # it changes the way unicode input is handled138            return '%s : %s' % (standardMsg, msg)139        except UnicodeDecodeError:140            return '%s : %s' % (standardMsg, msg)141    def assertRaises(self, expected_exception, *args, **kwargs):142        """Fail unless an exception of class expected_exception is raised143           by the callable when invoked with specified positional and144           keyword arguments. If a different type of exception is145           raised, it will not be caught, and the test case will be146           deemed to have suffered an error, exactly as for an147           unexpected exception.148           If called with the callable and arguments omitted, will return a149           context object used like this::150                with self.assertRaises(SomeException):151                    do_something()152           An optional keyword argument 'msg' can be provided when assertRaises153           is used as a context object.154           The context manager keeps a reference to the exception as155           the 'exception' attribute. This allows you to inspect the156           exception after the assertion::157               with self.assertRaises(SomeException) as cm:158                   do_something()159               the_exception = cm.exception160               self.assertEqual(the_exception.error_code, 3)161        """162        context = _AssertRaisesContext(expected_exception, self)163        try:164            return context.handle('assertRaises', args, kwargs)165        finally:166            # bpo-23890: manually break a reference cycle167            context = None168    def assertRaisesRegex(self, expected_exception,169                          expected_regex, *args, **kwargs):170        """Asserts that the message in a raised exception matches a regex.171        Args:172            expected_exception: Exception class expected to be raised.173            expected_regex: Regex (re pattern object or string) expected174                    to be found in error message.175            args: Function to be called and extra positional args.176            kwargs: Extra kwargs.177            msg: Optional message used in case of failure. Can only be used178                    when assertRaisesRegex is used as a context manager.179        """180        context = _AssertRaisesContext(expected_exception,181                                       self, expected_regex)...

utils.py

Source:utils.py

1from __future__ import print_function2import functools3import os4import re5import shutil6import sys7import tempfile8import subprocess9from catkin_tools.commands.catkin import main as catkin_main10try:11    # Python212    from StringIO import StringIO13except ImportError:14    # Python315    from io import StringIO16try:17    from subprocess import TimeoutExpired18except ImportError:19    class TimeoutExpired(object):20        pass21TESTS_DIR = os.path.dirname(__file__)22MOCK_DIR = os.path.join(TESTS_DIR, 'mock_resources')23def catkin_success(args, env={}):24    orig_environ = dict(os.environ)25    try:26        os.environ.update(env)27        catkin_main(args)28    except SystemExit as exc:29        ret = exc.code30        if ret != 0:31            import traceback32            traceback.print_exc()33    finally:34        os.environ = orig_environ35    return ret == 036def catkin_failure(args, env={}):37    orig_environ = dict(os.environ)38    try:39        os.environ.update(env)40        catkin_main(args)41    except SystemExit as exc:42        ret = exc.code43    finally:44        os.environ = orig_environ45    return ret != 046class AssertRaisesContext(object):47    def __init__(self, expected, expected_regex=None):48        self.expected = expected49        self.expected_regex = expected_regex50    def __enter__(self):51        return self52    def __exit__(self, exc_type, exc_value, tb):53        if self.expected is None:54            if exc_type is None:55                return True56            else:57                raise58        if exc_type is None:59            try:60                exc_name = self.expected.__name__61            except AttributeError:62                exc_name = str(self.expected)63            raise AssertionError("{0} not raised".format(exc_name))64        if not issubclass(exc_type, self.expected):65            raise66        if self.expected_regex is None:67            return True68        expected_regex = self.expected_regex69        expected_regex = re.compile(expected_regex)70        if not expected_regex.search(str(exc_value)):71            raise AssertionError("'{0}' does not match '{1}'".format(expected_regex.pattern, str(exc_value)))72        return True73class redirected_stdio(object):74    def __enter__(self):75        self.original_stdout = sys.stdout76        self.original_stderr = sys.stderr77        self.out = StringIO()78        self.err = StringIO()79        sys.stdout = self.out80        sys.stderr = self.err81        return self.out, self.err82    def __exit__(self, exc_type, exc_value, traceback):83        sys.stdout = self.original_stdout84        sys.stderr = self.original_stderr85        print(self.out.getvalue())86class temporary_directory(object):87    def __init__(self, prefix=''):88        self.prefix = prefix89        self.delete = False90    def __enter__(self):91        self.original_cwd = os.getcwd()92        self.temp_path = tempfile.mkdtemp(prefix=self.prefix)93        os.chdir(self.temp_path)94        return self.temp_path95    def __exit__(self, exc_type, exc_value, traceback):96        if self.delete and self.temp_path and os.path.exists(self.temp_path):97            print('Deleting temporary testind directory: %s' % self.temp_path)98            shutil.rmtree(self.temp_path)99        if self.original_cwd and os.path.exists(self.original_cwd):100            os.chdir(self.original_cwd)101def in_temporary_directory(f):102    @functools.wraps(f)103    def decorated(*args, **kwds):104        with temporary_directory() as directory:105            from inspect import getargspec106            # If it takes directory of kwargs and kwds does already have107            # directory, inject it108            if 'directory' not in kwds and 'directory' in getargspec(f)[0]:109                kwds['directory'] = directory110            return f(*args, **kwds)111    decorated.__name__ = f.__name__112    return decorated113def run(args, **kwargs):114    """115    Call to Popen, returns (errcode, stdout, stderr)116    """117    print("run:", args)118    p = subprocess.Popen(119        args,120        stdout=subprocess.PIPE,121        stderr=subprocess.STDOUT,122        universal_newlines=True,123        cwd=kwargs.get('cwd', os.getcwd()))124    print("P==", p.__dict__)125    (stdout, stderr) = p.communicate()126    return (p.returncode, stdout, stderr)127def assert_cmd_success(cmd, **kwargs):128    """129    Asserts that running a command returns zero.130    returns: stdout131    """132    print(">>>", cmd, kwargs)133    (r, out, err) = run(cmd, **kwargs)134    print("<<<", str(out))135    assert r == 0, "cmd failed with result %s:\n %s " % (r, str(cmd))136    return out137def assert_cmd_failure(cmd, **kwargs):138    """139    Asserts that running a command returns non-zero.140    returns: stdout141    """142    print(">>>", cmd, kwargs)143    (r, out, err) = run(cmd, withexitstatus=True, **kwargs)144    print("<<<", str(out))145    assert 0 != r, "cmd succeeded, but it should fail: %s result=%u\noutput=\n%s" % (cmd, r, out)146    return out147def assert_files_exist(prefix, files):148    """149    Assert that all files exist in the prefix.150    """151    for f in files:152        p = os.path.join(prefix, f)153        print("Checking for", p)...

Playwright tutorial

LambdaTest’s Playwright tutorial will give you a broader idea about the Playwright automation framework, its unique features, and use cases with examples to exceed your understanding of Playwright testing. This tutorial will give A to Z guidance, from installing the Playwright framework to some best practices and advanced concepts.

Chapters:

What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
Playwright Futuristic Features: Launched in 2020, Playwright gained huge popularity quickly because of some obliging features such as Playwright Test Generator and Inspector, Playwright Reporter, Playwright auto-waiting mechanism and etc. Read up on those features to master Playwright testing.
What is Component Testing: Component testing in Playwright is a unique feature that allows a tester to test a single component of a web application without integrating them with other elements. Learn how to perform Component testing on the Playwright automation framework.
Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
Functions and Selectors in Playwright: Learn how to launch the Chromium browser with Playwright. Also, gain a better understanding of some important functions like “BrowserContext,” which allows you to run multiple browser sessions, and “newPage” which interacts with a page.
Handling Alerts and Dropdowns in Playwright : Playwright interact with different types of alerts and pop-ups, such as simple, confirmation, and prompt, and different types of dropdowns, such as single selector and multi-selector get your hands-on with handling alerts and dropdown in Playright testing.
Playwright vs Puppeteer: Get to know about the difference between two testing frameworks and how they are different than one another, which browsers they support, and what features they provide.
Run Playwright Tests on LambdaTest: Playwright testing with LambdaTest leverages test performance to the utmost. You can run multiple Playwright tests in Parallel with the LammbdaTest test cloud. Get a step-by-step guide to run your Playwright test on the LambdaTest platform.
Playwright Python Tutorial: Playwright automation framework support all major languages such as Python, JavaScript, TypeScript, .NET and etc. However, there are various advantages to Python end-to-end testing with Playwright because of its versatile utility. Get the hang of Playwright python testing with this chapter.
Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.