Add some failing tests around has_many assocs...

..where no serializer is defined for the thing that is has_many'd

test/serializers/associations_test.rb

@@ -29,8 +29,10 @@ module ActiveModel
         @author.roles = []
         @blog = Blog.new({ name: 'AMS Blog' })
         @post = Post.new({ title: 'New Post', body: 'Body' })
+        @tag = Tag.new({name: '#hashtagged'})
         @comment = Comment.new({ id: 1, body: 'ZOMG A COMMENT' })
         @post.comments = [@comment]
+        @post.tags = [@tag]
         @post.blog = @blog
         @comment.post = @post
         @comment.author = nil
@@ -65,6 +67,12 @@ module ActiveModel
         end
       end
 
+      def test_has_many_with_no_serializer
+        PostWithTagsSerializer.new(@post).each_association do |name, serializer, options|
+          puts "The line above will crash this test"
+        end
+      end
+
       def test_serializer_options_are_passed_into_associations_serializers
         @post_serializer.each_association do |name, association|
           if name == :comments