51 lines
1.6 KiB
Python
51 lines
1.6 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import sys
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import fixtures
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class DisableModuleFixture(fixtures.Fixture):
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"""A fixture to provide support for unloading/disabling modules."""
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def __init__(self, module, *args, **kwargs):
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super(DisableModuleFixture, self).__init__(*args, **kwargs)
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self.module = module
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def setUp(self):
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"""Ensure ImportError for the specified module."""
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super(DisableModuleFixture, self).setUp()
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cleared_modules = {}
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for name in list(sys.modules.keys()):
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if name == self.module or name.startswith(self.module + '.'):
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cleared_modules[name] = sys.modules.pop(name)
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finder = _NoModuleFinder(self.module)
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sys.meta_path.insert(0, finder)
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self.addCleanup(sys.meta_path.remove, finder)
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self.addCleanup(sys.modules.update, cleared_modules)
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class _NoModuleFinder(object):
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"""Disallow further imports of 'module'."""
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def __init__(self, module):
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self.module = module
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def find_module(self, fullname, path):
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if fullname == self.module or fullname.startswith(self.module + '.'):
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raise ImportError
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