<!DOCTYPE html>
<title>window.requestIdleCallback exists</title>
<link rel="author" title="Ross McIlroy" href="mailto:rmcilroy@chromium.org" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
// The window.requestIdleCallback function is used to request callbacks during browser-defined idle time.
test(function() {
  assert_equals(typeof window.requestIdleCallback, "function");
}, "window.requestIdleCallback is defined");

// The window.cancelIdleCallback function is used to cancel callbacks scheduled via requestIdleCallback.
test(function() {
  assert_equals(typeof window.cancelIdleCallback, "function");
}, "window.cancelIdleCallback is defined");

// The requestIdleCallback method MUST return a long
test(function() {
  assert_equals(typeof window.requestIdleCallback(function() {}), "number");
}, "window.requestIdleCallback() returns a number");

// The cancelIdleCallback method MUST return undefined
test(function() {
  assert_equals(typeof window.cancelIdleCallback(1), "undefined");
}, "window.cancelIdleCallback() returns undefined");

async_test(function() {
  // Check whether requestIdleCallback schedules a callback which gets executed
  // and the deadline argument is passed correctly.
  requestIdleCallback(this.step_func_done(function(deadline) {
    assert_equals(arguments.length, 1, "Only one argument should be passed to callback.");
    assert_class_string(deadline, "IdleDeadline");
    assert_equals(typeof deadline.timeRemaining, "function", "IdleDeadline.timeRemaining MUST be a function which returns the time remaining in milliseconds");
    assert_equals(typeof deadline.timeRemaining(), "number", "IdleDeadline.timeRemaining MUST return a double of the time remaining in milliseconds");
    assert_true(deadline.timeRemaining() <= 50, "IdleDeadline.timeRemaining() MUST be less than or equal to 50ms in the future.");
    assert_equals(typeof deadline.didTimeout, "boolean", "IdleDeadline.didTimeout MUST be a boolean");
    assert_false(deadline.didTimeout, "IdleDeadline.didTimeout MUST be false if requestIdleCallback wasn't scheduled due to a timeout");
  }));
}, 'requestIdleCallback schedules callbacks');

async_test(function() {
  // Check whether requestIdleCallback schedules a callback which gets executed
  // and the deadline argument is passed correctly.
  var handle = requestIdleCallback(this.step_func(function(deadline) {
    assert_unreached("callback should not be called if canceled with cancelIdleCallback");
  }));
  cancelIdleCallback(handle);
  step_timeout(this.step_func_done(), 200);
}, 'cancelIdleCallback cancels callbacks');

</script>
<h1>Basic requestIdleCallback Tests</h1>
<div id="log"></div>