Added a few more tests for feedback models

cms/static/coffee/spec/models/feedback_spec.coffee

 describe "CMS.Models.SystemFeedback", ->
-  m = new CMS.Models.SystemFeedback()
+  beforeEach ->
+    @model = new CMS.Models.SystemFeedback()
 
   it "should have an empty message by default", ->
-    expect(m.get("message")).toEqual("")
+    expect(@model.get("message")).toEqual("")
+
+  it "should have an empty title by default", ->
+    expect(@model.get("title")).toEqual("")
+
+  it "should not have a type set by default", ->
+    expect(@model.get("type")).toBeNull()
+
+  it "should be shown by default", ->
+    expect(@model.get("shown")).toEqual(true)
+
+  it "should trigger a change event on calling .hide()", ->
+    spy = jasmine.createSpy()
+    @model.on("change", spy)
+
+    @model.hide()
+
+    expect(@model.get("shown")).toEqual(false)
+    expect(spy).toHaveBeenCalled()
+
+describe "CMS.Models.WarningMessage", ->
+  beforeEach ->
+    @model = new CMS.Models.WarningMessage()
+
+  it "should have the correct type", ->
+    expect(@model.get("type")).toEqual("warning")
+
+describe "CMS.Models.ErrorMessage", ->
+  beforeEach ->
+    @model = new CMS.Models.ErrorMessage()
+
+  it "should have the correct type", ->
+    expect(@model.get("type")).toEqual("error")
+
+describe "CMS.Models.ConfirmationMessage", ->
+  beforeEach ->
+    @model = new CMS.Models.ConfirmationMessage()
+
+  it "should have the correct type", ->
+    expect(@model.get("type")).toEqual("confirmation")
+