adding test for TreeNode- how the fuck could this remain untested?

test/tree_node_test.rb

@@ -0,0 +1,19 @@
+require 'test_helper'
+
+class TreeNodeTest < ActiveSupport::TestCase
+  context "initialization" do
+    setup do
+
+    end
+
+    should "return true for #root? without parent" do
+      assert MouseWidget.new(nil, :mum).root?
+    end
+
+    should "return false for #root? with parent" do
+      @mum = MouseWidget.new(nil, :mum)
+      assert_not MouseWidget.new(@mum, :kid).root?
+    end
+
+  end
+end