FIX: Remove unused test

spec/components/plugin/instance_spec.rb

@@ -160,27 +160,6 @@ describe Plugin::Instance do
     end
   end
 
-  context "themes" do
-    it "can register a theme" do
-      plugin = Plugin::Instance.new nil, "/tmp/test.rb"
-      plugin.register_theme('plugin') do |theme|
-        theme.set_color_scheme(
-          primary: 'ffff00',
-          secondary: '222222',
-          tertiary: '0f82af',
-          quaternary: 'c14924',
-          header_background: '111111',
-          header_primary: '333333',
-          highlight: 'a87137',
-          danger: 'e45735',
-          success: '1ca551',
-          love: 'fa6c8d'
-        )
-      end
-      expect(plugin.themes).to be_present
-    end
-  end
-
   context "register_color_scheme" do
     it "can add a color scheme for the first time" do
       plugin = Plugin::Instance.new nil, "/tmp/test.rb"