1 files changed, 80 insertions, 0 deletions
diff --git a/spec/services/clusters/applications/patch_service_spec.rb b/spec/services/clusters/applications/patch_service_spec.rb
new file mode 100644
index 00000000000..3ebe0540837
--- /dev/null
+++ b/spec/services/clusters/applications/patch_service_spec.rb
@@ -0,0 +1,80 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Clusters::Applications::PatchService do
+  describe '#execute' do
+    let(:application) { create(:clusters_applications_knative, :scheduled) }
+    let!(:update_command) { application.update_command }
+    let(:service) { described_class.new(application) }
+    let(:helm_client) { instance_double(Gitlab::Kubernetes::Helm::Api) }
+
+    before do
+      allow(service).to receive(:update_command).and_return(update_command)
+      allow(service).to receive(:helm_api).and_return(helm_client)
+    end
+
+    context 'when there are no errors' do
+      before do
+        expect(helm_client).to receive(:update).with(update_command)
+        allow(ClusterWaitForAppInstallationWorker).to receive(:perform_in).and_return(nil)
+      end
+
+      it 'make the application updating' do
+        expect(application.cluster).not_to be_nil
+        service.execute
+
+        expect(application).to be_updating
+      end
+
+      it 'schedule async installation status check' do
+        expect(ClusterWaitForAppInstallationWorker).to receive(:perform_in).once
+
+        service.execute
+      end
+    end
+
+    context 'when kubernetes cluster communication fails' do
+      let(:error) { Kubeclient::HttpError.new(500, 'system failure', nil) }
+
+      before do
+        expect(helm_client).to receive(:update).with(update_command).and_raise(error)
+      end
+
+      include_examples 'logs kubernetes errors' do
+        let(:error_name) { 'Kubeclient::HttpError' }
+        let(:error_message) { 'system failure' }
+        let(:error_code) { 500 }
+      end
+
+      it 'make the application errored' do
+        service.execute
+
+        expect(application).to be_update_errored
+        expect(application.status_reason).to match('Kubernetes error: 500')
+      end
+    end
+
+    context 'a non kubernetes error happens' do
+      let(:application) { create(:clusters_applications_knative, :scheduled) }
+      let(:error) { StandardError.new('something bad happened') }
+
+      include_examples 'logs kubernetes errors' do
+        let(:error_name) { 'StandardError' }
+        let(:error_message) { 'something bad happened' }
+        let(:error_code) { nil }
+      end
+
+      before do
+        expect(helm_client).to receive(:update).with(update_command).and_raise(error)
+      end
+
+      it 'make the application errored' do
+        service.execute
+
+        expect(application).to be_update_errored
+        expect(application.status_reason).to eq('Failed to update.')
+      end
+    end
+  end
+end