Build: Auto-convert sources to AMD

jQuery source has been migrated in gh-4541 from AMD to ES modules. To maintain
support for consumers of our AMD modules, this commits adds a task transpiling
the ES modules sources in `src/` to AMD in `amd/`.

A "Load with AMD" checkbox was also restored to the QUnit setup. Note that,
contrary to jQuery 3.x, AMD files need to be generated via `grunt amd` or
`grunt` as sources are not authored in ECMAScript modules. To achieve a similar
no-compile experience during jQuery 4.x testing, use the new "Load as modules"
checkbox which works in all supported browsers except for IE & Edge (the
legacy, EdgeHTML-based one).

Ref gh-4541
Closes gh-4554

1 files changed, 7 insertions, 5 deletions

diff --git a/test/data/testinit.js b/test/data/testinit.js
index 7a8697189..4088e4671 100644
--- a/test/data/testinit.js
+++ b/test/data/testinit.js
@@ -299,14 +299,16 @@ QUnit.testUnlessIE = QUnit.isIE ? QUnit.skip : QUnit.test;
 
 this.loadTests = function() {
 
-	// Directly load tests that need synchronous evaluation
-	if ( !QUnit.urlParams.esmodules || document.readyState === "loading" ) {
+	// QUnit.config is populated from QUnit.urlParams but only at the beginning
+	// of the test run. We need to read both.
+	var amd = QUnit.config.amd || QUnit.urlParams.amd;
+
+	// Directly load tests that need evaluation before DOMContentLoaded.
+	if ( !amd || document.readyState === "loading" ) {
 		document.write( "<script src='" + parentUrl + "test/unit/ready.js'><\x2Fscript>" );
 	} else {
 		QUnit.module( "ready", function() {
-			QUnit.test( "jQuery ready", function( assert ) {
-				assert.ok( false, "Test should be initialized before DOM ready" );
-			} );
+			QUnit.skip( "jQuery ready tests skipped in async mode", function() {} );
 		} );
 	}