from undercover import css


def test_empty_string():
    assert css.optimize_css("") == ""


def test_simple_definition():
    simple_definition = """
    div {
      width: 100%;
    }
    """
    assert css.optimize_css(simple_definition) == "div{width:100%;}"


def test_multi_part_property():
    simple_definition = """
    div {
      padding: 1em 2em 3em 4em;
    }
    """
    assert css.optimize_css(simple_definition) == "div{padding:1em 2em 3em 4em;}"