Tests: Update the loader so test pages always get jQuery

Pages used for iframe tests will now successfully load jQuery, even when
opened directly in the browser.

Closes gh-3489

test/jquery.js

@@ -2,21 +2,35 @@
 ( function() {
 	/* global loadTests: false */
 
-	var src,
-		path = window.location.pathname.split( "test" )[ 0 ],
+	var path = window.location.pathname.split( "test" )[ 0 ],
 		QUnit = window.QUnit || parent.QUnit,
-		require = window.require || parent.require;
-
-	// iFrames won't load AMD (the iframe tests synchronously expect jQuery to be there)
-	QUnit.config.urlConfig.push( {
-		id: "amd",
-		label: "Load with AMD",
-		tooltip: "Load the AMD jQuery file (and its dependencies)"
-	} );
-
-	// If QUnit is on window, this is the main window
-	// This detection allows AMD tests to be run in an iframe
-	if ( QUnit.urlParams.amd && window.QUnit ) {
+		require = window.require || parent.require,
+
+		// Default to unminified jQuery for directly-opened iframes
+		urlParams = QUnit ?
+			QUnit.urlParams :
+			{ dev: true },
+		src = urlParams.dev ?
+			"dist/jquery.js" :
+			"dist/jquery.min.js";
+
+	// Define configuration parameters controlling how jQuery is loaded
+	if ( QUnit ) {
+		QUnit.config.urlConfig.push( {
+			id: "amd",
+			label: "Load with AMD",
+			tooltip: "Load the AMD jQuery file (and its dependencies)"
+		} );
+		QUnit.config.urlConfig.push( {
+			id: "dev",
+			label: "Load unminified",
+			tooltip: "Load the development (unminified) jQuery file"
+		} );
+	}
+
+	// Honor AMD loading on the main window (detected by seeing QUnit on it).
+	// This doesn't apply to iframes because they synchronously expect jQuery to be there.
+	if ( urlParams.amd && window.QUnit ) {
 		require.config( {
 			baseUrl: path
 		} );
@@ -28,28 +42,15 @@
 		} else {
 			require( [ src ] );
 		}
-		return;
-	}
 
-	// Config parameter to use minified jQuery
-	QUnit.config.urlConfig.push( {
-		id: "dev",
-		label: "Load unminified",
-		tooltip: "Load the development (unminified) jQuery file"
-	} );
-	if ( QUnit.urlParams.dev ) {
-		src = "dist/jquery.js";
+	// Otherwise, load synchronously
 	} else {
-		src = "dist/jquery.min.js";
-	}
-
-	// Load jQuery
-	document.write( "<script id='jquery-js' src='" + path + src + "'><\x2Fscript>" );
+		document.write( "<script id='jquery-js' src='" + path + src + "'><\x2Fscript>" );
 
-	// Synchronous-only tests
-	// Other tests are loaded from the test page
-	if ( typeof loadTests !== "undefined" ) {
-		document.write( "<script src='" + path + "test/unit/ready.js'><\x2Fscript>" );
+		// Synchronous-only tests (other tests are loaded from the test page)
+		if ( typeof loadTests !== "undefined" ) {
+			document.write( "<script src='" + path + "test/unit/ready.js'><\x2Fscript>" );
+		}
 	}
 
 } )();