Tests for Service Worker

packages/venia-concept/src/ServiceWorker/Utilities/__tests__/catalogCacheHandler.spec.js

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+import { THIRTY_DAYS, CATALOG_CACHE_NAME } from '../../defaults';
+import { createCatalogCacheHandler } from '../catalogCacheHandler';
+
+function StaleWhileRevalidate(options = {}) {
+    this.cacheName = options.cacheName;
+    this.plugins = options.plugins;
+}
+
+function CacheableResponsePlugin(options = {}) {
+    this.statuses = options.statuses;
+}
+
+function ExpirationPlugin(options = {}) {
+    this.maxEntries = options.maxEntries;
+    this.maxAgeSeconds = options.maxAgeSeconds;
+}
+
+beforeAll(() => {
+    global.workbox = {
+        strategies: {
+            StaleWhileRevalidate
+        },
+        cacheableResponse: {
+            Plugin: CacheableResponsePlugin
+        },
+        expiration: {
+            Plugin: ExpirationPlugin
+        }
+    };
+});
+
+test('createCatalogCacheHandler should return an instance of workbox.strategies.StaleWhileRevalidate', () => {
+    expect(createCatalogCacheHandler()).toBeInstanceOf(StaleWhileRevalidate);
+});
+
+test('createCatalogCacheHandler should generate handler with cacheName set to the value of CATALOG_CACHE_NAME', () => {
+    expect(createCatalogCacheHandler().cacheName).toBe(CATALOG_CACHE_NAME);
+});
+
+test('createCatalogCacheHandler should generate handler with the exipiration plugin', () => {
+    const handler = createCatalogCacheHandler();
+    const [expirationPlugin] = handler.plugins.filter(
+        plugin => plugin instanceof ExpirationPlugin
+    );
+
+    expect(expirationPlugin.maxEntries).toBe(60);
+    expect(expirationPlugin.maxAgeSeconds).toBe(THIRTY_DAYS);
+});
+
+test('createCatalogCacheHandler should use the cacheable response plugin for statuses 0 and 200', () => {
+    const handler = createCatalogCacheHandler();
+    const [cacheableResponsePlugin] = handler.plugins.filter(
+        plugin => plugin instanceof CacheableResponsePlugin
+    );
+
+    expect(cacheableResponsePlugin.statuses).toEqual([0, 200]);
+});

packages/venia-concept/src/ServiceWorker/Utilities/__tests__/htmlHandler.spec.js

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+jest.mock('../messageHandler');
+
+import { HTML_UPDATE_AVAILABLE } from '@magento/venia-ui/lib/constants/swMessageTypes';
+
+import { cacheHTMLPlugin } from '../htmlHandler';
+import { sendMessageToWindow } from '../messageHandler';
+
+const matchFn = jest.fn();
+
+beforeAll(() => {
+    global.caches = {
+        match: matchFn
+    };
+    global.Request = function(url, { method, headers } = {}) {
+        this.url = url;
+        this.method = method;
+        this.headers = headers;
+    };
+    global.Response = function() {};
+});
+
+beforeEach(() => {
+    sendMessageToWindow.mockClear();
+});
+
+test('cacheHTMLPlugin should have cacheKeyWillBeUsed, requestWillFetch, fetchDidSucceed async functions implemented', () => {
+    matchFn.mockReturnValue(Promise.resolve(null));
+
+    expect(cacheHTMLPlugin).toHaveProperty('cacheKeyWillBeUsed');
+    expect(cacheHTMLPlugin).toHaveProperty('requestWillFetch');
+    expect(cacheHTMLPlugin).toHaveProperty('fetchDidSucceed');
+
+    expect(cacheHTMLPlugin.cacheKeyWillBeUsed).toBeInstanceOf(Function);
+    expect(cacheHTMLPlugin.requestWillFetch).toBeInstanceOf(Function);
+    expect(cacheHTMLPlugin.fetchDidSucceed).toBeInstanceOf(Function);
+
+    expect(cacheHTMLPlugin.cacheKeyWillBeUsed()).toBeInstanceOf(Promise);
+    expect(
+        cacheHTMLPlugin.requestWillFetch({
+            request: new Request('https://develop.pwa-venia.com/')
+        })
+    ).toBeInstanceOf(Promise);
+    expect(
+        cacheHTMLPlugin.fetchDidSucceed({
+            request: new Request('https://develop.pwa-venia.com/'),
+            response: new Response()
+        })
+    ).toBeInstanceOf(Promise);
+});
+
+test('cacheKeyWillBeUsed function should return a promise that resolves to /', async () => {
+    const response = await cacheHTMLPlugin.cacheKeyWillBeUsed();
+
+    expect(response).toBe('/');
+});
+
+test('requestWillFetch should return a new Request with url set to /', async () => {
+    const request = new Request('https://develop.pwa-venia.com/');
+    const response = await cacheHTMLPlugin.requestWillFetch({ request });
+
+    expect(response.url).not.toBe(request.url);
+});
+
+test('fetchDidSucceed should return the same response object given to it in params', async () => {
+    const request = new Request('https://develop.pwa-venia.com/');
+    const response = new Response();
+
+    const returnedResponse = await cacheHTMLPlugin.fetchDidSucceed({
+        request,
+        response
+    });
+
+    expect(returnedResponse).toBe(response);
+});
+
+test('fetchDidSucceed should not call sendMessageToWindow if the cache does not have a response for the url', async () => {
+    const request = new Request('https://develop.pwa-venia.com/');
+    const response = new Response();
+
+    await cacheHTMLPlugin.fetchDidSucceed({
+        request,
+        response
+    });
+
+    expect(sendMessageToWindow).not.toHaveBeenCalled();
+});
+
+test('fetchDidSucceed should call sendMessageToWindow if the response is different from what is in the cache', async () => {
+    /**
+     * Mocking Request to return different value when .text is called.
+     */
+    global.Response.prototype.text = function() {
+        return Promise.resolve(
+            `Hey I am random text ${Math.random()
+                .toString()
+                .slice(2)}`
+        );
+    };
+    global.Response.prototype.clone = function() {
+        return new Response();
+    };
+
+    /**
+     * Mocking cache to have a response for 'https://develop.pwa-venia.com/'
+     */
+    matchFn.mockReturnValue(Promise.resolve(new Response()));
+
+    const url = 'https://develop.pwa-venia.com/';
+    const request = new Request(url);
+    const response = new Response();
+
+    await cacheHTMLPlugin.fetchDidSucceed({ request, response });
+
+    expect(sendMessageToWindow).toHaveBeenCalledTimes(1);
+    expect(sendMessageToWindow).toHaveBeenCalledWith(HTML_UPDATE_AVAILABLE);
+});
+
+test('fetchDidSucceed should not call sendMessageToWindow if the response if same as that in the cache', async () => {
+    /**
+     * Mocking Request to return same value when .text is called.
+     */
+    global.Response.prototype.text = function() {
+        return Promise.resolve('Hey I am same text');
+    };
+    global.Response.prototype.clone = function() {
+        return new Response();
+    };
+
+    /**
+     * Mocking cache to have a response for 'https://develop.pwa-venia.com/'
+     */
+    matchFn.mockReturnValue(Promise.resolve(new Response()));
+
+    const url = 'https://develop.pwa-venia.com/';
+    const request = new Request(url);
+    const response = new Response();
+
+    await cacheHTMLPlugin.fetchDidSucceed({ request, response });
+
+    expect(sendMessageToWindow).not.toHaveBeenCalled();
+});

packages/venia-concept/src/ServiceWorker/Utilities/__tests__/imageCacheHandler.spec.js

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+import {
+    isResizedCatalogImage,
+    findSameOrLargerImage
+} from '../imageCacheHandler';
+
+describe('Testing isResizedCatalogImage', () => {
+    const validCatalogImageURL =
+        'https://develop.pwa-venia.com/media/catalog/product/cache/6ff2031bbe5bd4726a5a91896c8bef9e/v/d/vd07-pe_main_2.jpg?auto=webp&format=pjpg&width=640&height=800';
+
+    const catalogImageURLWithInvalidWidth =
+        'https://develop.pwa-venia.com/media/catalog/product/cache/6ff2031bbe5bd4726a5a91896c8bef9e/v/d/vd07-pe_main_2.jpg?auto=webp&format=pjpg&width=640px&height=800px';
+
+    const invalidCatalogImageURL =
+        'https://develop.pwa-venia.com/product/cache/6ff2031bbe5bd4726a5a91896c8bef9e/v/d/vd07-pe_main_2.jpg?auto=webp&format=pjpg&width=640&height=800';
+
+    test('isResizedCatalogImage should return boolean', () => {
+        expect(
+            typeof isResizedCatalogImage({ url: new URL(validCatalogImageURL) })
+        ).toBe('boolean');
+    });
+
+    test('isResizedCatalogImage should return true if the url provided is a valid catalog image url', () => {
+        expect(
+            isResizedCatalogImage({ url: new URL(validCatalogImageURL) })
+        ).toBeTruthy();
+    });
+
+    test('isResizedCatalogImage should return false if /media/catalog is missing in the URL', () => {
+        expect(
+            isResizedCatalogImage({
+                url: new URL(invalidCatalogImageURL)
+            })
+        ).toBeFalsy();
+    });
+
+    test('isResizedCatalogImage should return false if width search param is not valid in the URL', () => {
+        expect(
+            isResizedCatalogImage({
+                url: new URL(catalogImageURLWithInvalidWidth)
+            })
+        ).toBeFalsy();
+    });
+
+    test('isResizedCatalogImage should throw error if url is missing in the function params', () => {
+        expect(() => isResizedCatalogImage()).toThrowError();
+    });
+});
+
+describe('Testing findSameOrLargerImage', () => {
+    beforeAll(() => {
+        global.caches = {
+            open: function() {
+                return Promise.resolve({
+                    matchAll: function() {
+                        return Promise.resolve([
+                            {
+                                url:
+                                    'https://develop.pwa-venia.com/media/catalog/v/s/vsk12-la_main_3.jpg?auto=webp&format=pjpg&width=160&height=200'
+                            },
+                            {
+                                url:
+                                    'https://develop.pwa-venia.com/media/catalog/v/s/vsk12-la_main_3.jpg?auto=webp&format=pjpg&width=320&height=400'
+                            },
+                            {
+                                url:
+                                    'https://develop.pwa-venia.com/media/catalog/v/s/vsk12-la_main_3.jpg?auto=webp&format=pjpg&width=1600&height=2000'
+                            }
+                        ]);
+                    }
+                });
+            }
+        };
+    });
+
+    test('Should return response from cache for same URL if available', async () => {
+        const expectedUrl =
+            'https://develop.pwa-venia.com/media/catalog/v/s/vsk12-la_main_3.jpg?auto=webp&format=pjpg&width=1600&height=2000';
+
+        const returnedResponse = await findSameOrLargerImage(
+            new URL(expectedUrl)
+        );
+
+        expect(returnedResponse.url).toBe(expectedUrl);
+    });
+
+    test('Should return the closest high resolution image response from cache for a given width', async () => {
+        const requestedUrl =
+            'https://develop.pwa-venia.com/media/catalog/v/s/vsk12-la_main_3.jpg?auto=webp&format=pjpg&width=800&height=1000';
+
+        const expectedUrl =
+            'https://develop.pwa-venia.com/media/catalog/v/s/vsk12-la_main_3.jpg?auto=webp&format=pjpg&width=1600&height=2000';
+
+        const returnedResponse = await findSameOrLargerImage(
+            new URL(requestedUrl)
+        );
+
+        expect(returnedResponse.url).toBe(expectedUrl);
+    });
+
+    test('Should return undefined if no closest high resolution image response is available in cache', async () => {
+        const requestedUrl =
+            'https://develop.pwa-venia.com/media/catalog/v/s/vsk12-la_main_3.jpg?auto=webp&format=pjpg&width=2400&height=3000';
+
+        const returnedResponse = await findSameOrLargerImage(
+            new URL(requestedUrl)
+        );
+
+        expect(returnedResponse).toBe(undefined);
+    });
+});