Work on RequireJS Jasmine test.

lms/static/coffee/spec/requirejs_spec.coffee

 describe "RequireJS namespacing", ->
   beforeEach ->
+
+    #
+    #         * Jasmine does not provide a way to use the typeof operator. We need
+    #         * to create our own custom matchers so that a TypeError is not thrown.
+    #
     @addMatchers
       requirejsTobeUndefined: ->
         typeof requirejs is "undefined"
@@ -16,6 +21,10 @@ describe "RequireJS namespacing", ->
     expect(window.RequireJS).toEqual jasmine.any(Object)
 
   it "check that requirejs(), require(), and define() are not in the global namespace", ->
+
+    # The custom matchers that we defined in the beforeEach() function do
+    # not operate on an object. We pass a dummy empty object {} not to
+    # confuse Jasmine.
     expect({}).requirejsTobeUndefined()
     expect({}).requireTobeUndefined()
     expect({}).defineTobeUndefined()
@@ -27,23 +36,54 @@ describe "RequireJS namespacing", ->
 describe "RequireJS module creation", ->
   inDefineCallback = undefined
   inRequireCallback = undefined
-  it "check that we can use RequireJS define() and require() a module", ->
+  it "check that we can use RequireJS to define() and require() a module", ->
+
+    # Because Require JS works asynchronously when defining and requiring
+    # modules, we need to use the special Jasmine functions runs(), and
+    # waitsFor() to set up this test.
     runs ->
+
+      # Initialize the variable that we will test for. They will be set
+      # to true in the appropriate callback functions called by Require
+      # JS. If their values do not change, this will mean that something
+      # is not working as is intended.
       inDefineCallback = false
       inRequireCallback = false
+
+      # Define our test module.
       RequireJS.define "test_module", [], ->
         inDefineCallback = true
+
+        # This module returns an object. It can be accessed via the
+        # Require JS require() function.
         module_status: "OK"
 
+
+      # Require our defined test module.
       RequireJS.require ["test_module"], (test_module) ->
         inRequireCallback = true
+
+        # If our test module was defined properly, then we should
+        # be able to get the object it returned, and query some
+        # property.
         expect(test_module.module_status).toBe "OK"
 
 
+
+    # We will wait for a specified amount of time (1 second), before
+    # checking if our module was defined and that we were able to
+    # require() the module.
     waitsFor (->
+
+      # If at least one of the callback functions was not reached, we
+      # fail this test.
       return false  if (inDefineCallback isnt true) or (inRequireCallback isnt true)
+
+      # Both of the callbacks were reached.
       true
     ), "We should eventually end up in the defined callback", 1000
+
+    # The final test behavior, after waitsFor() finishes waiting.
     runs ->
       expect(inDefineCallback).toBeTruthy()
       expect(inRequireCallback).toBeTruthy()