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'BZR_PLUGINS_AT', 'HOME'):
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self.preserved_env_vars[name] = os.environ.get(name)
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super(TestImportTariffs, self).setUp()
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self.log_path = osutils.pathjoin(self.test_home_dir, '.bzr.log')
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self.overrideEnv('BZR_LOG', self.log_path)