solution: 600dpi)");
    test_parsing("(resolution: 77dpcm)");

    test_parsing("(resolution: calc(1x + 2x))", "(resolution: calc(3dppx))");
    test_parsing("(resolution: calc(5x - 2x))", "(resolution: calc(3dppx))");
    test_parsing("(resolution: calc(1x * 3))", "(resolution: calc(3dppx))");
    test_parsing("(resolution: calc(6x / 2))", "(resolution: calc(3dppx))");
}

test_parsing("", "");
test_parsing(" ", "");
test_parsing("all", "all");
test_parsing(" all", "all");
test_parsing("   all   ", "all");