Core: Test all factory use cases from intro.js

There is a lot of logic in intro.js; now we test four cases:
1. (implicitly, via QUnit tests) A real browser with window being the global
2. Browserify where there are both global & window variables.
3. Node with jsdom where window is passed manually to the jQuery factory.
4. Pure Node with incorrect window passed; jQuery should throw then.

Previously the second & fourth case was not tested and the third was tested
in a way that interfered with the main test environment.

We now also test if in the Browserify case we're not creating a jQuery global
by default.

Fixes gh-2181
Closes gh-2234

1 files changed, 13 insertions, 0 deletions

diff --git a/build/tasks/promises_aplus_tests.js b/build/tasks/promises_aplus_tests.js
new file mode 100644
index 000000000..3e770a079
--- /dev/null
+++ b/build/tasks/promises_aplus_tests.js
@@ -0,0 +1,13 @@
+module.exports = function( grunt ) {
+
+	"use strict";
+
+	var spawnTest = require( "./lib/spawn_test.js" );
+
+	grunt.registerTask( "promises_aplus_tests", function() {
+		spawnTest( this.async(),
+			"./node_modules/.bin/promises-aplus-tests",
+			"test/promises_aplus_adapter.js"
+		);
+	} );
+};