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// Compares a mutation record to a predefined one
// mutationToCheck is a mutation record from the user agent
// expectedRecord is a mutation record minted by the test
// for expectedRecord, if properties are omitted, they get default ones
function checkRecords(target, mutationToCheck, expectedRecord) {
var mr1;
var mr2;
function checkField(property, isArray) {
var field = mr2[property];
if (isArray === undefined) {
isArray = false;
}
if (field instanceof Function) {
field = field();
} else if (field === undefined) {
if (isArray) {
field = new Array();
} else {
field = null;
}
}
if (isArray) {
assert_array_equals(mr1[property], field, property + " didn't match");
} else {
assert_equals(mr1[property], field, property + " didn't match");
}
}
assert_equals(mutationToCheck.length, expectedRecord.length, "mutation records must match");
for (var item = 0; item < mutationToCheck.length; item++) {
mr1 = mutationToCheck[item];
mr2 = expectedRecord[item];
if (mr2.target instanceof Function) {
assert_equals(mr1.target, mr2.target(), "target node must match");
} else if (mr2.target !== undefined) {
assert_equals(mr1.target, mr2.target, "target node must match");
} else {
assert_equals(mr1.target, target, "target node must match");
}
checkField("type");
checkField("addedNodes", true);
checkField("removedNodes", true);
checkField("previousSibling");
checkField("nextSibling");
checkField("attributeName");
checkField("attributeNamespace");
checkField("oldValue");
};
}
function runMutationTest(node, mutationObserverOptions, mutationRecordSequence, mutationFunction, description, target) {
var test = async_test(description);
function moc(mrl, obs) {
test.step(
function () {
if (target === undefined) target = node;
checkRecords(target, mrl, mutationRecordSequence);
test.done();
}
);
}
test.step(
function () {
(new MutationObserver(moc)).observe(node, mutationObserverOptions);
mutationFunction();
}
);
return mutationRecordSequence.length
}
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