LayoutTests/imported/w3c/web-platform-tests/css/support/parsing-testcommon.js

'use strict';

// serializedValue can be the expected serialization of value,
// or an array of permitted serializations,
// or omitted if value should serialize as value.
function test_valid_value(property, value, serializedValue) {
    if (arguments.length < 3)
        serializedValue = value;

    var stringifiedValue = JSON.stringify(value);

    test(function(){
        var div = document.getElementById('target') || document.createElement('div');
        div.style[property] = "";
        div.style[property] = value;
        var readValue = div.style.getPropertyValue(property);
        assert_not_equals(readValue, "", "property should be set");
        if (Array.isArray(serializedValue))
            assert_in_array(readValue, serializedValue, "serialization should be sound");
        else
            assert_equals(readValue, serializedValue, "serialization should be canonical");

        div.style[property] = readValue;
        assert_equals(div.style.getPropertyValue(property), readValue, "serialization should round-trip");

    }, "e.style['" + property + "'] = " + stringifiedValue + " should set the property value");
}

function test_invalid_value(property, value) {
    var stringifiedValue = JSON.stringify(value);

    test(function(){
        var div = document.getElementById('target') || document.createElement('div');
        div.style[property] = "";
        div.style[property] = value;
        assert_equals(div.style.getPropertyValue(property), "");
    }, "e.style['" + property + "'] = " + stringifiedValue + " should not set the property value");
}