mews.page/validator/tests/test_css.py

"""The section 5.2 comparison: an unmodified copy, plus added @font-face rules."""

from importlib import resources

from mews import css

CANONICAL = resources.files("mews.data").joinpath("mews-0.1.css").read_text("utf-8")

FONT_FACE = """@font-face {
  font-family: "Atkinson Hyperlegible";
  src: url(/fonts/atkinson.woff2) format("woff2");
}

"""


def test_an_unmodified_copy_passes():
    assert css.compare(CANONICAL).equal


def test_line_endings_and_trailing_spaces_do_not_matter():
    mangled = CANONICAL.replace("\n", "   \r\n") + "\n\n\n"
    assert css.compare(mangled).equal


def test_an_added_font_face_passes_and_is_read():
    result = css.compare(FONT_FACE + CANONICAL)
    assert result.equal
    assert result.font_urls == ["/fonts/atkinson.woff2"]


def test_a_font_face_at_the_end_also_passes():
    assert css.compare(CANONICAL + "\n" + FONT_FACE).equal


def test_a_changed_rule_fails_with_a_line_number():
    result = css.compare(CANONICAL.replace("#faf8f3", "#ffffff"))
    assert not result.equal
    assert result.diff_line == 5
    assert "background-color" in result.diff


def test_a_reordered_rule_fails():
    lines = CANONICAL.split("\n")
    swapped = "\n".join([*lines[:4], lines[5], lines[4], *lines[6:]])
    assert not css.compare(swapped).equal


def test_a_removed_rule_fails():
    assert not css.compare(CANONICAL.replace("hr {", "hr-off {")).equal


def test_an_import_is_noticed():
    assert css.compare('@import url("x.css");\n' + CANONICAL).has_import


def test_a_font_face_inside_a_media_query_is_not_stripped():
    inner = "@media screen {\n" + FONT_FACE + "}\n"
    result = css.compare(CANONICAL + inner)
    assert not result.equal