def test_missing_argument(script):
    result = script.pip('show', expect_error=True)
    assert 'ERROR: Please provide a package name or names.' in result.stderr
Should return a dict mapping prefixes to Query subclasses.
dataset/ETHPy150Open pypa/pip/tests/functional/test_show.py/test_missing_argument--crossover with--dataset/ETHPy150Open beetbox/beets/beets/plugins.py/BeetsPlugin.queries