1 files changed, 25 insertions, 0 deletions
diff --git a/spec/serializers/diff_line_serializer_spec.rb b/spec/serializers/diff_line_serializer_spec.rb
new file mode 100644
index 00000000000..6dd8abd0579
--- /dev/null
+++ b/spec/serializers/diff_line_serializer_spec.rb
@@ -0,0 +1,25 @@
+require 'spec_helper'
+
+describe DiffLineSerializer do
+  let(:line) { Gitlab::Diff::Line.new('hello world', 'new', 1, nil, 1) }
+  let(:serializer) { described_class.new.represent(line) }
+
+  describe '#to_json' do
+    subject { serializer.to_json }
+
+    it 'matches the schema' do
+      expect(subject).to match_schema('entities/diff_line')
+    end
+
+    context 'when lines are parallel' do
+      let(:right_line) { Gitlab::Diff::Line.new('right line', 'new', 1, nil, 1) }
+      let(:left_line) { Gitlab::Diff::Line.new('left line', 'match', 1, nil, 1) }
+      let(:parallel_line) { [{ right: right_line, left: left_line }] }
+      let(:serializer) { described_class.new.represent(parallel_line, {}, DiffLineParallelEntity) }
+
+      it 'matches the schema' do
+        expect(subject).to match_schema('entities/diff_line_parallel')
+      end
+    end
+  end
+end