Function package_not_installed

tests/unit/utils.py:51–60

(name)

@contextmanager
def package_not_installed(name):
    try:
        orig = sys.modules.get(name)
        sys.modules[name] = None
        yield
    finally:
        if orig is not None:
            sys.modules[name] = orig
        else:
            del sys.modules[name]