Added test for mercure info helpers

test/mercure/helpers/index.test.js

@@ -0,0 +1,57 @@
+import { EventSourcePolyfill as EventSource } from 'event-source-polyfill';
+import { bindToMercureTopic } from '../../../src/mercure/helpers';
+
+jest.mock('event-source-polyfill');
+
+describe('helpers', () => {
+  afterEach(jest.resetAllMocks);
+
+  describe('bindToMercureTopic', () => {
+    const onMessage = jest.fn();
+    const onTokenExpired = jest.fn();
+
+    it.each([
+      [{ loading: true, error: false }],
+      [{ loading: false, error: true }],
+      [{ loading: true, error: true }],
+    ])('does not bind an EventSource when loading or error', (mercureInfo) => {
+      bindToMercureTopic(mercureInfo)();
+
+      expect(EventSource).not.toHaveBeenCalled();
+      expect(onMessage).not.toHaveBeenCalled();
+      expect(onTokenExpired).not.toHaveBeenCalled();
+    });
+
+    it('binds an EventSource when mercure info is properly loaded', () => {
+      const token = 'abc.123.efg';
+      const mercureHubUrl = 'https://example.com/.well-known/mercure';
+      const topic = 'foo';
+      const hubUrl = new URL(mercureHubUrl);
+
+      hubUrl.searchParams.append('topic', topic);
+
+      const callback = bindToMercureTopic({
+        loading: false,
+        error: false,
+        mercureHubUrl,
+        token,
+      }, topic, onMessage, onTokenExpired)();
+
+      expect(EventSource).toHaveBeenCalledWith(hubUrl, {
+        headers: {
+          Authorization: `Bearer ${token}`,
+        },
+      });
+
+      const [ es ] = EventSource.mock.instances;
+
+      es.onmessage({ data: '{"foo": "bar"}' });
+      es.onerror({ status: 401 });
+      expect(onMessage).toHaveBeenCalledWith({ foo: 'bar' });
+      expect(onTokenExpired).toHaveBeenCalled();
+
+      callback();
+      expect(es.close).toHaveBeenCalled();
+    });
+  });
+});

test/mercure/reducers/mercureInfo.test.js

@@ -3,7 +3,7 @@ import reducer, {
   GET_MERCURE_INFO_ERROR,
   GET_MERCURE_INFO,
   loadMercureInfo,
-} from '../../src/mercure/reducers/mercureInfo.js';
+} from '../../../src/mercure/reducers/mercureInfo.js';
 
 describe('mercureInfoReducer', () => {
   const mercureInfo = {