jquery/test/unit/deferred.js

QUnit.module( "deferred", {
	teardown: moduleTeardown
} );

jQuery.each( [ "", " - new operator" ], function( _, withNew ) {

	function createDeferred( fn ) {
		return withNew ? new jQuery.Deferred( fn ) : jQuery.Deferred( fn );
	}

	QUnit.test( "jQuery.Deferred" + withNew, function( assert ) {

		assert.expect( 23 );

		var defer = createDeferred();

		assert.ok( jQuery.isFunction( defer.pipe ), "defer.pipe is a function" );

		createDeferred().resolve().done( function() {
			assert.ok( true, "Success on resolve" );
			assert.strictEqual( this.state(), "resolved", "Deferred is resolved (state)" );
		} ).fail( function() {
			assert.ok( false, "Error on resolve" );
		} ).always( function() {
			assert.ok( true, "Always callback on resolve" );
		} );

		createDeferred().reject().done( function() {
			assert.ok( false, "Success on reject" );
		} ).fail( function() {
			assert.ok( true, "Error on reject" );
			assert.strictEqual( this.state(), "rejected", "Deferred is rejected (state)" );
		} ).always( function() {
			assert.ok( true, "Always callback on reject" );
		} );

		createDeferred( function( defer ) {
			assert.ok( this === defer, "Defer passed as this & first argument" );
			this.resolve( "done" );
		} ).done( function( value ) {
			assert.strictEqual( value, "done", "Passed function executed" );
		} );

		createDeferred( function( defer ) {
			var promise = defer.promise(),
				func = function() {},
				funcPromise = defer.promise( func );
			assert.strictEqual( defer.promise(), promise, "promise is always the same" );
			assert.strictEqual( funcPromise, func, "non objects get extended" );
			jQuery.each( promise, function( key ) {
				if ( !jQuery.isFunction( promise[ key ] ) ) {
					assert.ok( false, key + " is a function (" + jQuery.type( promise[ key ] ) + ")" );
				}
				if ( promise[ key ] !== func[ key ] ) {
					assert.strictEqual( func[ key ], promise[ key ], key + " is the same" );
				}
			} );
		} );

		jQuery.expandedEach = jQuery.each;
		jQuery.expandedEach( "resolve reject".split( " " ), function( _, change ) {
			createDeferred( function( defer ) {
				assert.strictEqual( defer.state(), "pending", "pending after creation" );
				var checked = 0;
				defer.progress( function( value ) {
					assert.strictEqual( value, checked, "Progress: right value (" + value + ") received" );
				} );
				for ( checked = 0; checked < 3; checked++ ) {
					defer.notify( checked );
				}
				assert.strictEqual( defer.state(), "pending", "pending after notification" );
				defer[ change ]();
				assert.notStrictEqual( defer.state(), "pending", "not pending after " + change );
				defer.notify();
			} );
		} );
	} );
} );

QUnit.test( "jQuery.Deferred - chainability", function( assert ) {

	var defer = jQuery.Deferred();

	assert.expect( 10 );

	jQuery.expandedEach = jQuery.each;
	jQuery.expandedEach( "resolve reject notify resolveWith rejectWith notifyWith done fail progress always".split( " " ), function( _, method ) {
		var object = {
			m: defer[ method ]
		};
		assert.strictEqual( object.m(), object, method + " is chainable" );
	} );
} );

QUnit.test( "jQuery.Deferred.then - filtering (done)", function( assert ) {

	assert.expect( 4 );

	var value1, value2, value3,
		defer = jQuery.Deferred(),
		piped = defer.then( function( a, b ) {
			return a * b;
		} ),
		done = jQuery.map( new Array( 3 ), function() { return assert.async(); } );

	piped.done( function( result ) {
		value3 = result;
	} );

	defer.done( function( a, b ) {
		value1 = a;
		value2 = b;
	} );

	defer.resolve( 2, 3 ).then( function() {
		assert.strictEqual( value1, 2, "first resolve value ok" );
		assert.strictEqual( value2, 3, "second resolve value ok" );
		assert.strictEqual( value3, 6, "result of filter ok" );
		done.pop().call();
	} );

	jQuery.Deferred().reject().then( function() {
		assert.ok( false, "then should not be called on reject" );
	} ).then( null, done.pop() );

	jQuery.Deferred().resolve().then( jQuery.noop ).done( function( value ) {
		assert.strictEqual( value, undefined, "then done callback can return undefined/null" );
		done.pop().call();
	} );
} );

QUnit.test( "jQuery.Deferred.then - filtering (fail)", function( assert ) {

	assert.expect( 4 );

	var value1, value2, value3,
		defer = jQuery.Deferred(),
		piped = defer.then( null, function( a, b ) {
			return a * b;
		} ),
		done = jQuery.map( new Array( 3 ), function() { return assert.async(); } );

	piped.done( function( result ) {
		value3 = result;
	} );

	defer.fail( function( a, b ) {
		value1 = a;
		value2 = b;
	} );

	defer.reject( 2, 3 ).then( null, function() {
		assert.strictEqual( value1, 2, "first reject value ok" );
		assert.strictEqual( value2, 3, "second reject value ok" );
		assert.strictEqual( value3, 6, "result of filter ok" );
		done.pop().call();
	} );

	jQuery.Deferred().resolve().then( null, function() {
		assert.ok( false, "then should not be called on resolve" );
	} ).then( done.pop() );

	jQuery.Deferred().reject().then( null, jQuery.noop ).done( function( value ) {
		assert.strictEqual( value, undefined, "then fail callback can return undefined/null" );
		done.pop().call();
	} );
} );

QUnit.test( "jQuery.Deferred.catch", function( assert ) {
	assert.expect( 4 );

	var value1, value2, value3,
		defer = jQuery.Deferred(),
		piped = defer[ "catch" ]( function( a, b ) {
			return a * b;
		} ),
		done = jQuery.map( new Array( 3 ), function() { return assert.async(); } );

	piped.done( function( result ) {
		value3 = result;
	} );

	defer.fail( function( a, b ) {
		value1 = a;
		value2 = b;
	} );

	defer.reject( 2, 3 )[ "catch" ]( function() {
		assert.strictEqual( value1, 2, "first reject value ok" );
		assert.strictEqual( value2, 3, "second reject value ok" );
		assert.strictEqual( value3, 6, "result of filter ok" );
		done.pop().call();
	} );

	jQuery.Deferred().resolve()[ "catch" ]( function() {
		assert.ok( false, "then should not be called on resolve" );
	} ).then( done.pop() );

	jQuery.Deferred().reject()[ "catch" ]( jQuery.noop ).done( function( value ) {
		assert.strictEqual( value, undefined, "then fail callback can return undefined/null" );
		done.pop().call();
	} );
} );

QUnit.test( "[PIPE ONLY] jQuery.Deferred.pipe - filtering (fail)", function( assert ) {

	assert.expect( 4 );

	var value1, value2, value3,
		defer = jQuery.Deferred(),
		piped = defer.pipe( null, function( a, b ) {
			return a * b;
		} ),
		done = jQuery.map( new Array( 3 ), function() { return assert.async(); } );

	piped.fail( function( result ) {
		value3 = result;
	} );

	defer.fail( function( a, b ) {
		value1 = a;
		value2 = b;
	} );

	defer.reject( 2, 3 ).pipe( null, function() {
		assert.strictEqual( value1, 2, "first reject value ok" );
		assert.strictEqual( value2, 3, "second reject value ok" );
		assert.strictEqual( value3, 6, "result of filter ok" );
		done.pop().call();
	} );

	jQuery.Deferred().resolve().pipe( null, function() {
		assert.ok( false, "then should not be called on resolve" );
	} ).then( done.pop() );

	jQuery.Deferred().reject().pipe( null, jQuery.noop ).fail( function( value ) {
		assert.strictEqual( value, undefined, "then fail callback can return undefined/null" );
		done.pop().call();
	} );
} );

QUnit.test( "jQuery.Deferred.then - filtering (progress)", function( assert ) {

	assert.expect( 3 );

	var value1, value2, value3,
		defer = jQuery.Deferred(),
		piped = defer.then( null, null, function( a, b ) {
			return a * b;
		} ),
		done = assert.async();

	piped.progress( function( result ) {
		value3 = result;
	} );

	defer.progress( function( a, b ) {
		value1 = a;
		value2 = b;
	} );

	defer.notify( 2, 3 ).then( null, null, function() {
		assert.strictEqual( value1, 2, "first progress value ok" );
		assert.strictEqual( value2, 3, "second progress value ok" );
		assert.strictEqual( value3, 6, "result of filter ok" );
		done();
	} );
} );

QUnit.test( "jQuery.Deferred.then - deferred (done)", function( assert ) {

	assert.expect( 3 );

	var value1, value2, value3,
		defer = jQuery.Deferred(),
		piped = defer.then( function( a, b ) {
			return jQuery.Deferred( function( defer ) {
				defer.reject( a * b );
			} );
		} ),
		done = assert.async();

	piped.fail( function( result ) {
		value3 = result;
	} );

	defer.done( function( a, b ) {
		value1 = a;
		value2 = b;
	} );

	defer.resolve( 2, 3 );

	piped.fail( function() {
		assert.strictEqual( value1, 2, "first resolve value ok" );
		assert.strictEqual( value2, 3, "second resolve value ok" );
		assert.strictEqual( value3, 6, "result of filter ok" );
		done();
	} );
} );

QUnit.test( "jQuery.Deferred.then - deferred (fail)", function( assert ) {

	assert.expect( 3 );

	var value1, value2, value3,
		defer = jQuery.Deferred(),
		piped = defer.then( null, function( a, b ) {
			return jQuery.Deferred( function( defer ) {
				defer.resolve( a * b );
			} );
		} ),
		done = assert.async();

	piped.done( function( result ) {
		value3 = result;
	} );

	defer.fail( function( a, b ) {
		value1 = a;
		value2 = b;
	} );

	defer.reject( 2, 3 );

	piped.done( function() {
		assert.strictEqual( value1, 2, "first reject value ok" );
		assert.strictEqual( value2, 3, "second reject value ok" );
		assert.strictEqual( value3, 6, "result of filter ok" );
		done();
	} );
} );

QUnit.test( "jQuery.Deferred.then - deferred (progress)", function( assert ) {

	assert.expect( 3 );

	var value1, value2, value3,
		defer = jQuery.Deferred(),
		piped = defer.then( null, null, function( a, b ) {
			return jQuery.Deferred( function( defer ) {
				defer.resolve( a * b );
			} );
		} ),
		done = assert.async();

	piped.progress( function( result ) {
		return jQuery.Deferred().resolve().then( function() {
			return result;
		} ).then( function( result ) {
			value3 = result;
		} );
	} );

	defer.progress( function( a, b ) {
		value1 = a;
		value2 = b;
	} );

	defer.notify( 2, 3 );

	piped.then( null, null, function( result ) {
		return jQuery.Deferred().resolve().then( function() {
			return result;
		} ).then( function() {
			assert.strictEqual( value1, 2, "first progress value ok" );
			assert.strictEqual( value2, 3, "second progress value ok" );
			assert.strictEqual( value3, 6, "result of filter ok" );
			done();
		} );
	} );
} );

QUnit.test( "[PIPE ONLY] jQuery.Deferred.pipe - deferred (progress)", function( assert ) {

	assert.expect( 3 );

	var value1, value2, value3,
		defer = jQuery.Deferred(),
		piped = defer.pipe( null, null, function( a, b ) {
			return jQuery.Deferred( function( defer ) {
				defer.resolve( a * b );
			} );
		} ),
		done = assert.async();

	piped.done( function( result ) {
		value3 = result;
	} );

	defer.progress( function( a, b ) {
		value1 = a;
		value2 = b;
	} );

	defer.notify( 2, 3 );

	piped.done( function() {
		assert.strictEqual( value1, 2, "first progress value ok" );
		assert.strictEqual( value2, 3, "second progress value ok" );
		assert.strictEqual( value3, 6, "result of filter ok" );
		done();
	} );
} );

QUnit.test( "jQuery.Deferred.then - context", function( assert ) {

	assert.expect( 7 );

	var defer, piped, defer2, piped2,
		context = {},
		done = jQuery.map( new Array( 4 ), function() { return assert.async(); } );

	jQuery.Deferred().resolveWith( context, [ 2 ] ).then( function( value ) {
		return value * 3;
	} ).done( function( value ) {
		assert.notStrictEqual( this, context, "custom context not propagated through .then" );
		assert.strictEqual( value, 6, "proper value received" );
		done.pop().call();
	} );

	jQuery.Deferred().resolve().then( function() {
		return jQuery.Deferred().resolveWith( context );
	} ).done( function() {
		assert.strictEqual( this, context,
			"custom context of returned deferred correctly propagated" );
		done.pop().call();
	} );

	defer = jQuery.Deferred();
	piped = defer.then( function( value ) {
		return value * 3;
	} );

	defer.resolve( 2 );

	piped.done( function( value ) {
		assert.strictEqual( this, piped,
			"default context gets updated to latest promise in the chain" );
		assert.strictEqual( value, 6, "proper value received" );
		done.pop().call();
	} );

	defer2 = jQuery.Deferred();
	piped2 = defer2.then();

	defer2.resolve( 2 );

	piped2.done( function( value ) {
		assert.strictEqual( this, piped2,
			"default context updated to latest promise in the chain (without passing function)" );
		assert.strictEqual( value, 2, "proper value received (without passing function)" );
		done.pop().call();
	} );
} );

QUnit.test( "[PIPE ONLY] jQuery.Deferred.pipe - context", function( assert ) {

	assert.expect( 7 );

	var defer, piped, defer2, piped2,
		context = {},
		done = jQuery.map( new Array( 4 ), function() { return assert.async(); } );

	jQuery.Deferred().resolveWith( context, [ 2 ] ).pipe( function( value ) {
		return value * 3;
	} ).done( function( value ) {
		assert.strictEqual( this, context, "[PIPE ONLY] custom context correctly propagated" );
		assert.strictEqual( value, 6, "proper value received" );
		done.pop().call();
	} );

	jQuery.Deferred().resolve().pipe( function() {
		return jQuery.Deferred().resolveWith( context );
	} ).done( function() {
		assert.strictEqual( this, context,
			"custom context of returned deferred correctly propagated" );
		done.pop().call();
	} );

	defer = jQuery.Deferred();
	piped = defer.pipe( function( value ) {
		return value * 3;
	} );

	defer.resolve( 2 );

	piped.done( function( value ) {
		assert.strictEqual( this, piped,
			"default context gets updated to latest promise in the chain" );
		assert.strictEqual( value, 6, "proper value received" );
		done.pop().call();
	} );

	defer2 = jQuery.Deferred();
	piped2 = defer2.pipe();

	defer2.resolve( 2 );

	piped2.done( function( value ) {
		assert.strictEqual( this, piped2,
			"default context updated to latest promise in the chain (without passing function)" );
		assert.strictEqual( value, 2, "proper value received (without passing function)" );
		done.pop().call();
	} );
} );

QUnit.test( "jQuery.Deferred.then - spec compatibility", function( assert ) {

	assert.expect( 1 );

	var done = assert.async();

	var defer = jQuery.Deferred().done( function() {
		setTimeout( done );
		throw new Error();
	} );

	defer.then( function() {
		assert.ok( true, "errors in .done callbacks don't stop .then handlers" );
	} );

	try {
		defer.resolve();
	} catch ( _ ) {}
} );

QUnit[ window.console ? "test" : "skip" ]( "jQuery.Deferred.exceptionHook", function( assert ) {

	assert.expect( 1 );

	var done = assert.async(),
		defer = jQuery.Deferred(),
		oldWarn = window.console.warn;

	window.console.warn = function( msg ) {
		assert.ok( /barf/.test( msg ), "Message: " + msg );
	};
	jQuery.when(
		defer.then( function() {
			// Should get an error
			jQuery.barf();
		} ).then( null, jQuery.noop ),
		defer.then( function() {
			// Should NOT get an error
			throw new Error( "Make me a sandwich" );
		} ).then( null, jQuery.noop )
	).then( function( ) {
		window.console.warn = oldWarn;
		done();
	} );

	defer.resolve();
} );

QUnit[ window.console ? "test" : "skip" ]( "jQuery.Deferred.exceptionHook with stack hooks", function( assert ) {

	assert.expect( 2 );

	var done = assert.async(),
		defer = jQuery.Deferred(),
		oldWarn = window.console.warn;

	jQuery.Deferred.getStackHook = function() {
		// Default exceptionHook assumes the stack is in a form console.warn can log,
		// but a custom getStackHook+exceptionHook pair could save a raw form and
		// format it to a string only when an exception actually occurs.
		// For the unit test we just ensure the plumbing works.
		return "NO STACK FOR YOU";
	};

	window.console.warn = function( msg, stack ) {
		assert.ok( /cough_up_hairball/.test( msg ), "Function mentioned: " + msg );
		assert.ok( /NO STACK FOR YOU/.test( stack ), "Stack trace included: " + stack );
	};
	defer.then( function() {
		jQuery.cough_up_hairball();
	} ).then( null, function( ) {
		window.console.warn = oldWarn;
		delete jQuery.Deferred.getStackHook;
		done();
	} );

	defer.resolve();
} );

QUnit.test( "jQuery.Deferred - 1.x/2.x compatibility", function( assert ) {

	assert.expect( 8 );

	var context = { id: "callback context" },
		thenable = jQuery.Deferred().resolve( "thenable fulfillment" ).promise(),
		done = jQuery.map( new Array( 8 ), function() { return assert.async(); } );

	thenable.unwrapped = false;

	jQuery.Deferred().resolve( 1, 2 ).then( function() {
		assert.deepEqual( [].slice.call( arguments ), [ 1, 2 ],
			".then fulfillment callbacks receive all resolution values" );
		done.pop().call();
	} );
	jQuery.Deferred().reject( 1, 2 ).then( null, function() {
		assert.deepEqual( [].slice.call( arguments ), [ 1, 2 ],
			".then rejection callbacks receive all rejection values" );
		done.pop().call();
	} );
	jQuery.Deferred().notify( 1, 2 ).then( null, null, function() {
		assert.deepEqual( [].slice.call( arguments ), [ 1, 2 ],
			".then progress callbacks receive all progress values" );
		done.pop().call();
	} );

	jQuery.Deferred().resolveWith( context ).then( function() {
		assert.deepEqual( this, context, ".then fulfillment callbacks receive context" );
		done.pop().call();
	} );
	jQuery.Deferred().rejectWith( context ).then( null, function() {
		assert.deepEqual( this, context, ".then rejection callbacks receive context" );
		done.pop().call();
	} );
	jQuery.Deferred().notifyWith( context ).then( null, null, function() {
		assert.deepEqual( this, context, ".then progress callbacks receive context" );
		done.pop().call();
	} );

	jQuery.Deferred().resolve( thenable ).done( function( value ) {
		assert.strictEqual( value, thenable, ".done doesn't unwrap thenables" );
		done.pop().call();
	} );

	jQuery.Deferred().notify( thenable ).then().then( null, null, function( value ) {
		assert.strictEqual( value, "thenable fulfillment",
			".then implicit progress callbacks unwrap thenables" );
		done.pop().call();
	} );
} );

QUnit.test( "jQuery.Deferred.then - progress and thenables", function( assert ) {

	assert.expect( 2 );

	var trigger = jQuery.Deferred().notify(),
		expectedProgress = [ "baz", "baz" ],
		done = jQuery.map( new Array( 2 ), function() { return assert.async(); } ),
		failer = function( evt ) {
			return function() {
				assert.ok( false, "no unexpected " + evt );
			};
		};

	trigger.then( null, null, function() {
		var notifier = jQuery.Deferred().notify( "foo" );
		setTimeout( function() {
			notifier.notify( "bar" ).resolve( "baz" );
		} );
		return notifier;
	} ).then( failer( "fulfill" ), failer( "reject" ), function( v ) {
		assert.strictEqual( v, expectedProgress.shift(), "expected progress value" );
		done.pop().call();
	} );
	trigger.notify();
} );

QUnit.test( "jQuery.Deferred - notify and resolve", function( assert ) {

	assert.expect( 7 );

	var notifiedResolved = jQuery.Deferred().notify( "foo" )/*xxx .resolve( "bar" )*/,
		done = jQuery.map( new Array( 3 ), function() { return assert.async(); } );

	notifiedResolved.progress( function( v ) {
		assert.strictEqual( v, "foo", "progress value" );
	} );

	notifiedResolved.pipe().progress( function( v ) {
		assert.strictEqual( v, "foo", "piped progress value" );
	} );

	notifiedResolved.pipe( null, null, function() {
		return "baz";
	} ).progress( function( v ) {
		assert.strictEqual( v, "baz", "replaced piped progress value" );
	} );

	notifiedResolved.pipe( null, null, function() {
		return jQuery.Deferred().notify( "baz" ).resolve( "quux" );
	} ).progress( function( v ) {
		assert.strictEqual( v, "baz", "deferred replaced piped progress value" );
	} );

	notifiedResolved.then().progress( function( v ) {
		assert.strictEqual( v, "foo", "then'd progress value" );
		done.pop().call();
	} );

	notifiedResolved.then( null, null, function() {
		return "baz";
	} ).progress( function( v ) {
		assert.strictEqual( v, "baz", "replaced then'd progress value" );
		done.pop().call();
	} );

	notifiedResolved.then( null, null, function() {
		return jQuery.Deferred().notify( "baz" ).resolve( "quux" );
	} ).progress( function( v ) {

		// Progress from the surrogate deferred is ignored
		assert.strictEqual( v, "quux", "deferred replaced then'd progress value" );
		done.pop().call();
	} );
} );

QUnit.test( "jQuery.when", function( assert ) {

	assert.expect( 37 );

	// Some other objects
	jQuery.each( {
		"an empty string": "",
		"a non-empty string": "some string",
		"zero": 0,
		"a number other than zero": 1,
		"true": true,
		"false": false,
		"null": null,
		"undefined": undefined,
		"a plain object": {},
		"an array": [ 1, 2, 3 ]
	}, function( message, value ) {
		assert.ok(
			jQuery.isFunction(
				jQuery.when( value ).done( function( resolveValue ) {
					assert.strictEqual( this, window, "Context is the global object with " + message );
					assert.strictEqual( resolveValue, value, "Test the promise was resolved with " + message );
				} ).promise
			),
			"Test " + message + " triggers the creation of a new Promise"
		);
	} );

	assert.ok(
		jQuery.isFunction(
			jQuery.when().done( function( resolveValue ) {
				assert.strictEqual( this, window, "Test the promise was resolved with window as its context" );
				assert.strictEqual( resolveValue, undefined, "Test the promise was resolved with no parameter" );
			} ).promise
		),
		"Test calling when with no parameter triggers the creation of a new Promise"
	);

	var cache,
		context = {};

	jQuery.when( jQuery.Deferred().resolveWith( context ) ).done( function() {
		assert.strictEqual( this, context, "when( promise ) propagates context" );
	} );

	jQuery.each( [ 1, 2, 3 ], function( k, i ) {
		jQuery.when( cache || jQuery.Deferred( function() {
				this.resolve( i );
			} )
		).done( function( value ) {
			assert.strictEqual( value, 1, "Function executed" + ( i > 1 ? " only once" : "" ) );
			cache = value;
		} );

	} );
} );

QUnit.test( "jQuery.when - joined", function( assert ) {

	assert.expect( 81 );

	var deferreds = {
			rawValue: 1,
			fulfilled: jQuery.Deferred().resolve( 1 ),
			rejected: jQuery.Deferred().reject( 0 ),
			eventuallyFulfilled: jQuery.Deferred().notify( true ),
			eventuallyRejected: jQuery.Deferred().notify( true ),
			fulfilledStandardPromise: Promise.resolve( 1 ),
			rejectedStandardPromise: Promise.reject( 0 )
		},
		willSucceed = {
			rawValue: true,
			fulfilled: true,
			eventuallyFulfilled: true,
			fulfilledStandardPromise: true
		},
		willError = {
			rejected: true,
			eventuallyRejected: true,
			rejectedStandardPromise: true
		},
		counter = 49;

	QUnit.stop();

	function restart() {
		if ( !--counter ) {
			QUnit.start();
		}
	}

	jQuery.each( deferreds, function( id1, defer1 ) {
		jQuery.each( deferreds, function( id2, defer2 ) {
			var shouldResolve = willSucceed[ id1 ] && willSucceed[ id2 ],
				shouldError = willError[ id1 ] || willError[ id2 ],
				expected = shouldResolve ? [ 1, 1 ] : [ 0, undefined ],
				code = "jQuery.when( " + id1 + ", " + id2 + " )",
				context1 = defer1 && jQuery.isFunction( defer1.promise ) ? defer1.promise() : window,
				context2 = defer2 && jQuery.isFunction( defer2.promise ) ? defer2.promise() : window;

			jQuery.when( defer1, defer2 ).done( function( a, b ) {
				if ( shouldResolve ) {
					assert.deepEqual( [ a, b ], expected, code + " => resolve" );
					assert.strictEqual( this[ 0 ], context1, code + " => first context OK" );
					assert.strictEqual( this[ 1 ], context2, code + " => second context OK" );
				} else {
					assert.ok( false,  code + " => resolve" );
				}
			} ).fail( function( a, b ) {
				if ( shouldError ) {
					assert.deepEqual( [ a, b ], expected, code + " => reject" );
				} else {
					assert.ok( false, code + " => reject" );
				}
			} ).always( restart );
		} );
	} );
	deferreds.eventuallyFulfilled.resolve( 1 );
	deferreds.eventuallyRejected.reject( 0 );
} );

QUnit.test( "jQuery.when - notify does not affect resolved", function( assert ) {

	assert.expect( 3 );

	var a = jQuery.Deferred().notify( 1 ).resolve( 4 ),
		b = jQuery.Deferred().notify( 2 ).resolve( 5 ),
		c = jQuery.Deferred().notify( 3 ).resolve( 6 );

	jQuery.when( a, b, c ).done( function( a, b, c ) {
		assert.strictEqual( a, 4, "first resolve value ok" );
		assert.strictEqual( b, 5, "second resolve value ok" );
		assert.strictEqual( c, 6, "third resolve value ok" );
	} ).fail( function() {
		assert.ok( false, "Error on resolve" );
	} );
} );

QUnit.test( "jQuery.when - filtering", function( assert ) {

	assert.expect( 2 );

	function increment( x ) {
		return x + 1;
	}

	QUnit.stop();

	jQuery.when(
		jQuery.Deferred().resolve( 3 ).then( increment ),
		jQuery.Deferred().reject( 5 ).then( null, increment )
	).done( function( four, six ) {
		assert.strictEqual( four, 4, "resolved value incremented" );
		assert.strictEqual( six, 6, "rejected value incremented" );
		QUnit.start();
	} );
} );

QUnit.test( "jQuery.when - exceptions", function( assert ) {

	assert.expect( 2 );

	function woops() {
		throw "exception thrown";
	}

	QUnit.stop();

	jQuery.Deferred().resolve().then( woops ).fail( function( doneException ) {
		assert.strictEqual( doneException, "exception thrown", "throwing in done handler" );
		jQuery.Deferred().reject().then( null, woops ).fail( function( failException ) {
			assert.strictEqual( failException, "exception thrown", "throwing in fail handler" );
			QUnit.start();
		} );
	} );
} );

QUnit.test( "jQuery.when - chaining", function( assert ) {

	assert.expect( 4 );

	var defer = jQuery.Deferred();

	function chain() {
		return defer;
	}

	function chainStandard() {
		return Promise.resolve( "std deferred" );
	}

	QUnit.stop();

	jQuery.when(
		jQuery.Deferred().resolve( 3 ).then( chain ),
		jQuery.Deferred().reject( 5 ).then( null, chain ),
		jQuery.Deferred().resolve( 3 ).then( chainStandard ),
		jQuery.Deferred().reject( 5 ).then( null, chainStandard )
	).done( function( v1, v2, s1, s2 ) {
		assert.strictEqual( v1, "other deferred", "chaining in done handler" );
		assert.strictEqual( v2, "other deferred", "chaining in fail handler" );
		assert.strictEqual( s1, "std deferred", "chaining thenable in done handler" );
		assert.strictEqual( s2, "std deferred", "chaining thenable in fail handler" );
		QUnit.start();
	} );

	defer.resolve( "other deferred" );
} );

QUnit.test( "jQuery.when - solitary thenables", function( assert ) {

	assert.expect( 1 );

	var done = assert.async(),
		rejected = new Promise( function( resolve, reject ) {
			setTimeout( function() {
				reject( "rejected" );
			}, 100 );
		} );

	jQuery.when( rejected ).then(
		function() {
			assert.ok( false, "Rejected, solitary, non-Deferred thenable should not resolve" );
			done();
		},
		function() {
			assert.ok( true, "Rejected, solitary, non-Deferred thenable rejected properly" );
			done();
		}
	);
} );

QUnit.test( "jQuery.when does not reuse a solitary jQuery Deferred (gh-2018)", function( assert ) {

	assert.expect( 2 );
	var defer = jQuery.Deferred().resolve(),
		promise = jQuery.when( defer );

	assert.equal( promise.state(), "resolved", "Master Deferred is immediately resolved" );
	assert.notStrictEqual( defer.promise(), promise, "jQuery.when returns the master deferred's promise" );
} );