Manipulation: improve test for data-URI

Some environments do not support data-uri in "src" attribute of script element.
Mitigate it with equality assertion

Ref a467f86

Author: markelog

test/unit/manipulation.js

@@ -2437,9 +2437,25 @@ test( "Validate creation of multiple quantities of certain elements (#13818)", 4
 
 asyncTest( "Insert script with data-URI (gh-1887)", 1, function() {
 	Globals.register( "testFoo" );
-	jQuery( "#qunit-fixture" ).append( "<script src=\"data:text/javascript,testFoo = 'foo';\"></script>" );
+	Globals.register( "testSrcFoo" );
+
+	var script = document.createElement( "script" ),
+		fixture = document.getElementById( "qunit-fixture" );
+
+	script.src = "data:text/javascript,testSrcFoo = 'foo';";
+
+	fixture.appendChild( script );
+
+	jQuery( fixture ).append( "<script src=\"data:text/javascript,testFoo = 'foo';\"></script>" );
+
 	setTimeout(function() {
-		strictEqual( window[ "testFoo" ], "foo", "data-URI script executed" );
+		if ( window[ "testSrcFoo" ] === "foo" ) {
+			strictEqual( window[ "testFoo" ], window[ "testSrcFoo" ], "data-URI script executed" );
+
+		} else {
+			ok( true, "data-URI script is not supported by this environment" );
+		}
+
 		start();
-	}, 100 );
+	});
 });