anchor.diff:      super.postTest();
       arez.ArezTestUtil.resetConfig( true );
       org.realityforge.braincheck.BrainCheckTestUtil.resetConfig( true );
  +<% if repository.arez? -%>
  +    if ( !_ignoreObserverErrors && !_observerErrors.isEmpty() )
  +    {
  +      org.testng.Assert.fail( "Unexpected Observer Errors: " + _observerErrors.stream().collect( java.util.stream.Collectors.joining( "\n" ) ) );
  +    }
  +<% end -%>
     }
   
     @Override
  
positive.code:     return new <%= classname %>();
    }
  <% end -%>
  <% repository.gwt.test_class_contents.each do |content| %>
  <%= content -%>
  <% end -%>
  
negative.code:   implements org.testng.IHookable
  <% end -%>
  {
  <% if repository.arez? -%>
    private final java.util.ArrayList<String> _observerErrors = new java.util.ArrayList<>();
    private boolean _ignoreObserverErrors;
    private boolean _printObserverErrors;
  <% end -%>
  <% repository.gwt.test_factories.each do |short_code, classname| -%>
    @javax.annotation.Nonnull
    @edu.umd.cs.findbugs.annotations.SuppressFBWarnings( "NP_NONNULL_FIELD_NOT_INITIALIZED_IN_CONSTRUCTOR" )
  