1 files changed, 46 insertions, 0 deletions
diff --git a/spec/serializers/diffs_metadata_entity_spec.rb b/spec/serializers/diffs_metadata_entity_spec.rb
new file mode 100644
index 00000000000..aaca393ec27
--- /dev/null
+++ b/spec/serializers/diffs_metadata_entity_spec.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe DiffsMetadataEntity do
+  let(:user) { create(:user) }
+  let(:project) { create(:project, :repository) }
+  let(:request) { EntityRequest.new(project: project, current_user: user) }
+  let(:merge_request) { create(:merge_request_with_diffs, target_project: project, source_project: project) }
+  let(:merge_request_diffs) { merge_request.merge_request_diffs }
+  let(:merge_request_diff) { merge_request_diffs.last }
+
+  let(:entity) do
+    described_class.new(merge_request_diff.diffs,
+                        request: request,
+                        merge_request: merge_request,
+                        merge_request_diffs: merge_request_diffs)
+  end
+
+  context 'as json' do
+    subject { entity.as_json }
+
+    it 'contain only required attributes' do
+      expect(subject.keys).to contain_exactly(
+        # Inherited attributes
+        :real_size, :size, :branch_name,
+        :target_branch_name, :commit, :merge_request_diff,
+        :start_version, :latest_diff, :latest_version_path,
+        :added_lines, :removed_lines, :render_overflow_warning,
+        :email_patch_path, :plain_diff_path,
+        :merge_request_diffs,
+        # Attributes
+        :diff_files
+      )
+    end
+
+    describe 'diff_files' do
+      it 'returns diff files metadata' do
+        payload =
+          DiffFileMetadataEntity.represent(merge_request_diff.diffs.diff_files).as_json
+
+        expect(subject[:diff_files]).to eq(payload)
+      end
+    end
+  end
+end