Add message bus for #677

test/pubsub/redis.js

@@ -0,0 +1,52 @@
+const assert = require('assert');
+const { RedisMessageBus } = require('../../lib/pubsub/redis');
+const { EventEmitter } = require('events');
+const sinon = require('sinon');
+
+describe('RedisMessageBus', () => {
+    let pubClient, subClient, messageBus, publishSpy, subscribeSpy;
+
+    beforeEach(() => {
+        pubClient = { publish: () => {} };
+        subClient = new EventEmitter();
+
+        subClient.subscribe = () => {};
+        subscribeSpy = sinon.spy(subClient, 'subscribe');
+
+        publishSpy = sinon.spy(pubClient, 'publish');
+
+        messageBus = new RedisMessageBus(pubClient, subClient, 'test');
+
+        subClient.emit('ready');
+    });
+
+    describe('#onMessage', () => {
+        it('processes a valid message', done => {
+            messageBus.once('testEvent', payload => {
+                assert(subscribeSpy.withArgs('test').calledOnce);
+                assert.deepStrictEqual(payload, { foo: 'bar' });
+
+                done();
+            });
+
+            messageBus.onMessage('test', '{"event":"testEvent","payload":{"foo":"bar"}}');
+        });
+
+        it('processes a syntactically invalid message', done => {
+            messageBus.onMessage('test', 'not valid json lol');
+
+            done();
+        });
+    });
+
+    describe('#emit', () => {
+        it('emits messages', () => {
+            messageBus.emit('testEvent', { foo: 'bar' });
+
+            assert(publishSpy.withArgs('test', sinon.match(arg => {
+                arg = JSON.parse(arg);
+                return arg.event === 'testEvent' && arg.payload.foo === 'bar';
+            })).calledOnce);
+        });
+    });
+});