add spec for required attribute

Author: pascalwengerter

spec/usage/components/bdo_spec.rb

@@ -35,4 +35,19 @@ def response
     expect(stripped(static_output)).to include(stripped(expected_static_output))
 
   end
+
+  it 'Fails if required dir tag is not set' do
+    class ExamplePage < Matestack::Ui::Page
+      def response
+        components {
+          bdo text: 'Simple bdo ltr tag'
+        }
+      end
+    end
+
+    visit '/example'
+
+    expect(page).to have_content("required key 'dir' is missing")
+
+  end
 end