1 files changed, 36 insertions, 0 deletions
diff --git a/spec/serializers/pipeline_serializer_spec.rb b/spec/serializers/pipeline_serializer_spec.rb
new file mode 100644
index 00000000000..c4eba2f2537
--- /dev/null
+++ b/spec/serializers/pipeline_serializer_spec.rb
@@ -0,0 +1,36 @@
+require 'spec_helper'
+
+describe PipelineSerializer do
+  let(:serializer) do
+    described_class.new(user: user)
+  end
+
+  let(:pipelines) do
+    create_list(:ci_pipeline, 2)
+  end
+
+  let(:user) { create(:user) }
+
+  context 'when using incremental serializer' do
+    let(:json) do
+      serializer.incremental(pipelines, time).as_json
+    end
+
+    context 'when pipeline has been already updated' do
+      let(:time) { Time.now }
+
+      it 'exposes only minimal information' do
+        expect(json.first.keys).to contain_exactly(:id, :url)
+        expect(json.second.keys).to contain_exactly(:id, :url)
+      end
+    end
+
+    context 'when pipeline updated in the meantime' do
+      let(:time) { Time.now - 10.minutes }
+
+      it 'exposes new data incrementally' do
+        expect(json.first.keys.count).to eq 9
+      end
+    end
+  end
+end