1 files changed, 69 insertions, 0 deletions
diff --git a/spec/serializers/base_discussion_entity_spec.rb b/spec/serializers/base_discussion_entity_spec.rb
new file mode 100644
index 00000000000..5f483da4113
--- /dev/null
+++ b/spec/serializers/base_discussion_entity_spec.rb
@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe BaseDiscussionEntity do
+  let_it_be(:user) { create(:user) }
+  let_it_be(:note) { create(:discussion_note_on_merge_request) }
+
+  let(:request) { double('request', note_entity: ProjectNoteEntity) }
+  let(:controller) { double('controller') }
+  let(:entity) { described_class.new(discussion, request: request, context: controller) }
+  let(:discussion) { note.discussion }
+
+  subject { entity.as_json }
+
+  before do
+    allow(controller).to receive(:render_to_string)
+    allow(request).to receive(:current_user).and_return(user)
+    allow(request).to receive(:noteable).and_return(note.noteable)
+  end
+
+  it 'exposes correct attributes' do
+    expect(subject.keys.sort).to include(
+      :commit_id,
+      :confidential,
+      :diff_discussion,
+      :discussion_path,
+      :expanded,
+      :for_commit,
+      :id,
+      :individual_note,
+      :resolvable,
+      :resolve_path,
+      :resolve_with_issue_path
+    )
+  end
+
+  context 'when is LegacyDiffDiscussion' do
+    let(:project) { create(:project) }
+    let(:merge_request) { create(:merge_request, source_project: project) }
+    let(:discussion) { create(:legacy_diff_note_on_merge_request, noteable: merge_request, project: project).to_discussion }
+
+    it 'exposes correct attributes' do
+      expect(subject.keys.sort).to include(
+        :commit_id,
+        :diff_discussion,
+        :discussion_path,
+        :expanded,
+        :for_commit,
+        :id,
+        :individual_note
+      )
+    end
+  end
+
+  context 'when diff file is present' do
+    let(:note) { create(:diff_note_on_merge_request) }
+
+    it 'exposes diff file attributes' do
+      expect(subject.keys.sort).to include(
+        :active,
+        :diff_file,
+        :line_code,
+        :position,
+        :truncated_diff_lines
+      )
+    end
+  end
+end