Quoting another reply won't satisfy the minimum character count (fixes #180)

spec/javascripts/models/user_action_spec.js

@@ -0,0 +1,36 @@
+/*global waitsFor:true expect:true describe:true beforeEach:true it:true */
+
+describe("Discourse.UserAction", function() {
+
+  describe("collapseStream", function() {
+
+    it("collapses all likes", function() {
+      var actions = [
+        Discourse.UserAction.create({
+          action_type: Discourse.UserAction.LIKE,
+          topic_id: 1,
+          user_id: 1,
+          post_number: 1
+        }), Discourse.UserAction.create({
+          action_type: Discourse.UserAction.EDIT,
+          topic_id: 2,
+          user_id: 1,
+          post_number: 1
+        }), Discourse.UserAction.create({
+          action_type: Discourse.UserAction.LIKE,
+          topic_id: 1,
+          user_id: 2,
+          post_number: 1
+        })
+      ];
+
+      actions = Discourse.UserAction.collapseStream(actions);
+
+      expect(actions.length).toBe(2);
+      expect(actions[0].get("children").length).toBe(1);
+      expect(actions[0].get("children")[0].items.length).toBe(2);
+    });
+
+  });
+
+});