Add unit and integration tests for pubsub

test/unit/backends/pubsub-metrics-test.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const sinon = require('sinon');
+const assert = require('assert');
+const PubSubMetricsBackend = require('../../../lib/backends/pubsub-metrics');
+
+const fakeTopic = {
+    name: 'test-topic',
+    publish: sinon.stub().returns(Promise.resolve())
+};
+
+const fakePubSub = {
+    topic: () => fakeTopic
+};
+
+const eventAttributes = {
+    event_source: 'test',
+    user_id: '123',
+    event_group_id: '1',
+    response_code: '200',
+    source_domain: 'localhost',
+    event_time: new Date().toISOString(),
+    event_version: '1'
+};
+
+describe('pubsub metrics backend', function () {
+    it('should not send event if not enabled', function () {
+        const pubSubMetricsService = new PubSubMetricsBackend(fakePubSub, false);
+
+        pubSubMetricsService.sendEvent('test-event', eventAttributes);
+        assert(fakeTopic.publish.notCalled);
+    });
+
+    it('should send event if enabled', function () {
+        const pubSubMetricsService = new PubSubMetricsBackend(fakePubSub, true);
+
+        pubSubMetricsService.sendEvent('test-event', eventAttributes);
+        assert(fakeTopic.publish.calledOnceWith(Buffer.from('test-event'), eventAttributes));
+    });
+});