Add event model specs

Author: wendelfabianchinsamy

spec/models/event_spec.rb

@@ -246,9 +246,9 @@
       expect(event).to(validate_length_of(:uuid))
     end
 
-    # it "uuid uniqueness" do
-    #   expect(event).to(validate_uniqueness_of(:uuid).case_insensitive)
-    # end
+    it "uuid uniqueness" do
+      expect(event).to(validate_uniqueness_of(:uuid).case_insensitive)
+    end
 
     it "uuid format" do
       event.uuid = "invalid-uuid"