1 files changed, 51 insertions, 0 deletions
diff --git a/test/promises_aplus_adapter_when.js b/test/promises_aplus_adapter_when.js
new file mode 100644
index 000000000..0a5ec6756
--- /dev/null
+++ b/test/promises_aplus_adapter_when.js
@@ -0,0 +1,51 @@
+/* jshint node: true */
+
+"use strict";
+
+require( "jsdom" ).env( "", function( errors, window ) {
+	if ( errors ) {
+		console.error( errors );
+		return;
+	}
+
+	var jQuery = require( ".." )( window );
+
+	exports.deferred = function() {
+		var adopted, promised,
+			obj = {
+				resolve: function() {
+					if ( !adopted ) {
+						adopted = jQuery.when.apply( jQuery, arguments );
+						if ( promised ) {
+							adopted.then( promised.resolve, promised.reject );
+						}
+					}
+					return adopted;
+				},
+				reject: function( value ) {
+					if ( !adopted ) {
+						adopted = jQuery.when( jQuery.Deferred().reject( value ) );
+						if ( promised ) {
+							adopted.then( promised.resolve, promised.reject );
+						}
+					}
+					return adopted;
+				},
+
+				// A manually-constructed thenable that works even if calls precede resolve/reject
+				promise: {
+					then: function() {
+						if ( !adopted ) {
+							if ( !promised ) {
+								promised = jQuery.Deferred();
+							}
+							return promised.then.apply( promised, arguments );
+						}
+						return adopted.then.apply( adopted, arguments );
+					}
+				}
+			};
+
+		return obj;
+	};
+} );