def test_lookup_table_with_empty_values():
assert lookup_table((), operator.itemgetter(0)) == {}
def test_lookup_table_with_empty_values(key):
assert lookup_table((), key) == {}
def test_lookup_table(values, key):
expected = {"b": {"bar", "baz"}, "f": {"foo"}, "q": {"quux", "qux"}}
assert lookup_table(values, key) == expected
def test_lookup_table_requires_key(values):
with pytest.raises(
ValueError,
match=r"^The `key` function must be specified when the `values` are not empty\.$",
):
lookup_table(values)