init.js

(function () {
	window.equals = window.equal;
	window.same = window.deepEqual;

	// Store the old counts so that we only assert on tests that have actually leaked,
	// instead of asserting every time a test has leaked sometime in the past
	var oldCacheLength = 0,
		oldFragmentsLength = 0,
		oldTimersLength = 0,
		oldActive = 0;

	/**
	 * Ensures that tests have cleaned up properly after themselves. Should be passed as the
	 * teardown function on all modules' lifecycle object.
	 */
	this.moduleTeardown = function () {
		var i, fragmentsLength = 0, cacheLength = 0;

		// Allow QUnit.reset to clean up any attached elements before checking for leaks
		QUnit.reset();

		for ( i in jQuery.cache ) {
			++cacheLength;
		}

		jQuery.fragments = {};

		for ( i in jQuery.fragments ) {
			++fragmentsLength;
		}

		// Because QUnit doesn't have a mechanism for retrieving the number of expected assertions for a test,
		// if we unconditionally assert any of these, the test will fail with too many assertions :|
		if ( cacheLength !== oldCacheLength ) {
			equals( cacheLength, oldCacheLength, "No unit tests leak memory in jQuery.cache" );
			oldCacheLength = cacheLength;
		}
		if ( fragmentsLength !== oldFragmentsLength ) {
			equals( fragmentsLength, oldFragmentsLength, "No unit tests leak memory in jQuery.fragments" );
			oldFragmentsLength = fragmentsLength;
		}
		if ( jQuery.timers.length !== oldTimersLength ) {
			equals( jQuery.timers.length, oldTimersLength, "No timers are still running" );
			oldTimersLength = jQuery.timers.length;
		}
		if ( jQuery.active !== oldActive ) {
			equals( jQuery.active, 0, "No AJAX requests are still active" );
			oldActive = jQuery.active;
		}
	};
}());