c-size(max-content, size / 2)", "calc-size(max-content, 0.5 * size)");
test_valid_value("max-height", "calc-size(fit-content, 30px + size / 2)", "calc-size(fit-content, 30px + (0.5 * size))");
test_valid_value("width",      "calc-size(fit-content, 50% + size / 2)", "calc-size(fit-content, 50% + (0.5 * size))");

test_valid_value("width",      "calc-size(any, 25em)");
test_valid_value("width",      "calc-size(any, 40%)");
test_valid_value("width",      "calc-size(any, 50px + 30%)", "calc-size(any, 30% + 50px