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bzrlib/tests/test_import_tariff.py
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    """
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    def run_command_check_imports(self, args, forbidden_imports):
 
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        """Run bzr ARGS in a subprocess and check its imports.
 
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        This is fairly expensive because we start a subprocess, so we aim to
 
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        cover representative rather than exhaustive cases.
 
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        :param forbidden_imports: List of fully-qualified Python module names
 
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            that should not be loaded while running this command.
 
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        """
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        # We use PYTHON_VERBOSE rather than --profile-importts because in
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        # experimentation the profile-imports output seems to not always show
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        # the modules you'd expect; this can be debugged but python -v seems
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        # 'st' in a working tree shouldn't need many modules
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        self.make_branch_and_tree('.')
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        self.run_command_check_imports(['st'], [
 
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            'bzrlib.bundle.commands',
 
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            'bzrlib.cmd_version_info',
 
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            'bzrlib.foreign',
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            'bzrlib.remote',
 
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            'bzrlib.sign_my_commits',
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            'bzrlib.smart',
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            'smtplib',
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            'tarfile',
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            ])
 
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        # TODO: similar test for repository-only operations, checking we avoid
 
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        # loading wt-specific stuff
 
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        #
 
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        # See https://bugs.edge.launchpad.net/bzr/+bug/553017