Expose comments on Noteables in GraphQL

This exposes `Note`s on Issues & MergeRequests using a
`Types::Notes::NoteableType` in GraphQL.

Exposing notes on a new type can be done by implementing the
`NoteableType` interface on the type. The presented object should
be a `Noteable`.

1 files changed, 8 insertions, 0 deletions

diff --git a/spec/models/discussion_spec.rb b/spec/models/discussion_spec.rb
index 0d02165787a..22d4dab0617 100644
--- a/spec/models/discussion_spec.rb
+++ b/spec/models/discussion_spec.rb
@@ -29,4 +29,12 @@ describe Discussion do
       ])
     end
   end
+
+  describe 'authorization' do
+    it 'delegates to the first note' do
+      policy = DeclarativePolicy.policy_for(instance_double(User, id: 1), subject)
+
+      expect(policy).to be_a(NotePolicy)
+    end
+  end
 end