58 lines
1.9 KiB
Python
58 lines
1.9 KiB
Python
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# fixtures: Fixtures with cleanups for testing and convenience.
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#
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# Copyright (c) 2010, 2011, Robert Collins <robertc@robertcollins.net>
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#
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# Licensed under either the Apache License, Version 2.0 or the BSD 3-clause
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# license at the users choice. A copy of both licenses are available in the
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# project source as Apache-2.0 and BSD. You may not use this file except in
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# compliance with one of these two licences.
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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 these licenses 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 you chose for the specific language governing permissions and
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# limitations under that license.
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__all__ = [
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'EnvironmentVariable',
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'EnvironmentVariableFixture'
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]
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import os
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from fixtures import Fixture
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class EnvironmentVariable(Fixture):
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"""Isolate a specific environment variable."""
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def __init__(self, varname, newvalue=None):
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"""Create an EnvironmentVariable fixture.
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:param varname: the name of the variable to isolate.
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:param newvalue: A value to set the variable to. If None, the variable
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will be deleted.
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During setup the variable will be deleted or assigned the requested
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value, and this will be restored in cleanUp.
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"""
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super(EnvironmentVariable, self).__init__()
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self.varname = varname
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self.newvalue = newvalue
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def _setUp(self):
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varname = self.varname
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orig_value = os.environ.get(varname)
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if orig_value is not None:
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self.addCleanup(os.environ.__setitem__, varname, orig_value)
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del os.environ[varname]
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else:
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self.addCleanup(os.environ.pop, varname, '')
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if self.newvalue is not None:
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os.environ[varname] = self.newvalue
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else:
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os.environ.pop(varname, '')
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EnvironmentVariableFixture = EnvironmentVariable
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