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Viewing changes to breezy/tests/test_features.py

  • Committer: Jelmer Vernooij
  • Date: 2020-04-05 19:11:34 UTC
  • mto: (7490.7.16 work)
  • mto: This revision was merged to the branch mainline in revision 7501.
  • Revision ID: jelmer@jelmer.uk-20200405191134-0aebh8ikiwygxma5
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breezy/tests/test_features.py
 
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# Copyright (C) 2011, 2016 Canonical Ltd
 
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#
 
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# This program is free software; you can redistribute it and/or modify
 
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# it under the terms of the GNU General Public License as published by
 
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# the Free Software Foundation; either version 2 of the License, or
 
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# (at your option) any later version.
 
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#
 
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# This program is distributed in the hope that it will be useful,
 
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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# GNU General Public License for more details.
 
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#
 
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# You should have received a copy of the GNU General Public License
 
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# along with this program; if not, write to the Free Software
 
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
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"""Tests for test feature dependencies."""
 
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import sys
 
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from .. import (
 
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    plugin as _mod_plugin,
 
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    symbol_versioning,
 
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    tests,
 
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    )
 
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from . import (
 
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    features,
 
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    )
 
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class TestFeature(tests.TestCase):
 
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    def test_caching(self):
 
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        """Feature._probe is called by the feature at most once."""
 
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        class InstrumentedFeature(features.Feature):
 
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            def __init__(self):
 
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                super(InstrumentedFeature, self).__init__()
 
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                self.calls = []
 
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            def _probe(self):
 
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                self.calls.append('_probe')
 
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                return False
 
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        feature = InstrumentedFeature()
 
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        feature.available()
 
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        self.assertEqual(['_probe'], feature.calls)
 
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        feature.available()
 
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        self.assertEqual(['_probe'], feature.calls)
 
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    def test_named_str(self):
 
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        """Feature.__str__ should thunk to feature_name()."""
 
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        class NamedFeature(features.Feature):
 
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            def feature_name(self):
 
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                return 'symlinks'
 
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        feature = NamedFeature()
 
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        self.assertEqual('symlinks', str(feature))
 
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    def test_default_str(self):
 
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        """Feature.__str__ should default to __class__.__name__."""
 
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        class NamedFeature(features.Feature):
 
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            pass
 
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        feature = NamedFeature()
 
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        self.assertEqual('NamedFeature', str(feature))
 
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class TestUnavailableFeature(tests.TestCase):
 
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    def test_access_feature(self):
 
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        feature = features.Feature()
 
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        exception = tests.UnavailableFeature(feature)
 
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        self.assertIs(feature, exception.args[0])
 
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# Although this was deprecated a long time ago, please keep it here because
 
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# it's really just a test fixture for test-feature deprecation.
 
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simple_thunk_feature = features._CompatabilityThunkFeature(
 
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    symbol_versioning.deprecated_in((2, 1, 0)),
 
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    'breezy.tests.test_features',
 
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    'simple_thunk_feature',
 
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    'UnicodeFilenameFeature',
 
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    replacement_module='breezy.tests.features')
 
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class Test_CompatibilityFeature(tests.TestCase):
 
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    def test_does_thunk(self):
 
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        res = self.callDeprecated(
 
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            ['breezy.tests.test_features.simple_thunk_feature '
 
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             'was deprecated in version 2.1.0. '
 
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             'Use breezy.tests.features.UnicodeFilenameFeature instead.'],
 
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            simple_thunk_feature.available)
 
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        self.assertEqual(features.UnicodeFilenameFeature.available(), res)
 
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    def test_reports_correct_location(self):
 
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        a_feature = features._CompatabilityThunkFeature(
 
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            symbol_versioning.deprecated_in((2, 1, 0)),
 
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            'breezy.tests.test_features',
 
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            'a_feature',
 
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            'UnicodeFilenameFeature',
 
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            replacement_module='breezy.tests.features')
 
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        def test_caller(message, category=None, stacklevel=1):
 
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            # Find ourselves back from the right frame
 
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            caller = sys._getframe(stacklevel)
 
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            reported_file = caller.f_globals['__file__']
 
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            reported_lineno = caller.f_lineno
 
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            self.assertEqual(__file__, reported_file)
 
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            # The call we're tracking occurred the line after we grabbed the
 
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            # lineno.
 
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            self.assertEqual(self.lineno + 1, reported_lineno)
 
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        self.overrideAttr(symbol_versioning, 'warn', test_caller)
 
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        # Grab the current lineno
 
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        self.lineno = sys._getframe().f_lineno
 
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        self.requireFeature(a_feature)
 
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class TestModuleAvailableFeature(tests.TestCase):
 
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    def test_available_module(self):
 
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        feature = features.ModuleAvailableFeature('breezy.tests')
 
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        self.assertEqual('breezy.tests', feature.module_name)
 
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        self.assertEqual('breezy.tests', str(feature))
 
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        self.assertTrue(feature.available())
 
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        self.assertIs(tests, feature.module)
 
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    def test_unavailable_module(self):
 
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        feature = features.ModuleAvailableFeature(
 
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            'breezy.no_such_module_exists')
 
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        self.assertEqual('breezy.no_such_module_exists', str(feature))
 
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        self.assertFalse(feature.available())
 
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        self.assertIs(None, feature.module)
 
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class TestPluginLoadedFeature(tests.TestCase):
 
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    def test_available_plugin(self):
 
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        plugins = _mod_plugin.plugins()
 
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        if not plugins:
 
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            self.skipTest('no plugins available to test with')
 
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        a_plugin_name = next(iter(plugins))
 
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        feature = features.PluginLoadedFeature(a_plugin_name)
 
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        self.assertEqual(a_plugin_name, feature.plugin_name)
 
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        self.assertEqual(a_plugin_name + ' plugin', str(feature))
 
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        self.assertTrue(feature.available())
 
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    def test_unavailable_plugin(self):
 
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        feature = features.PluginLoadedFeature('idontexist')
 
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        self.assertEqual('idontexist plugin', str(feature))
 
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        self.assertFalse(feature.available())
 
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        self.assertIs(None, feature.plugin)
 
150
 
 
151
 
 
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class TestUnicodeFilenameFeature(tests.TestCase):
 
153
 
 
154
    def test_probe_passes(self):
 
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        """UnicodeFilenameFeature._probe passes."""
 
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        # We can't test much more than that because the behaviour depends
 
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        # on the platform.
 
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        features.UnicodeFilenameFeature._probe()
 
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160
 
 
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class TestBackslashFilenameFeature(tests.TestCase):
 
162
 
 
163
    def test_probe_passes(self):
 
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        """BackslashFilenameFeature._probe passes."""
 
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        # We can't test much more than that because the behaviour depends
 
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        # on the platform.
 
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        features.BackslashFilenameFeature._probe()