Add default settings for backstop

.gitignore

@@ -11,3 +11,5 @@ dist-ssr
 server/dist
 public/dist
 storybook-static/
+**/backstop_data/html_report
+**/backstop_data/bitmaps_test

apps/visual-regression/backstop.config.js

@@ -0,0 +1,57 @@
+/** @type {import('backstopjs').Config} */
+const config = {
+    id: "backstop_default",
+    viewports: [
+        {
+            label: "phone",
+            width: 320,
+            height: 480,
+        },
+        {
+            label: "tablet",
+            width: 1024,
+            height: 768,
+        },
+    ],
+    onBeforeScript: "puppet/onBefore.js",
+    onReadyScript: "puppet/onReady.js",
+    scenarios: [
+        {
+            label: "BackstopJS Homepage",
+            cookiePath: "backstop_data/engine_scripts/cookies.json",
+            url: "https://garris.github.io/BackstopJS/",
+            referenceUrl: "",
+            readyEvent: "",
+            readySelector: "",
+            delay: 0,
+            hideSelectors: [],
+            removeSelectors: [],
+            hoverSelector: "",
+            clickSelector: "",
+            postInteractionWait: 0,
+            selectors: [],
+            selectorExpansion: true,
+            expect: 0,
+            misMatchThreshold: 0.1,
+            requireSameDimensions: true,
+        },
+    ],
+    paths: {
+        bitmaps_reference: "backstop_data/bitmaps_reference",
+        bitmaps_test: "backstop_data/bitmaps_test",
+        engine_scripts: "backstop_data/engine_scripts",
+        html_report: "backstop_data/html_report",
+        ci_report: "backstop_data/ci_report",
+    },
+    report: ["browser"],
+    engine: "puppeteer",
+    engineOptions: {
+        args: ["--no-sandbox"],
+    },
+    asyncCaptureLimit: 5,
+    asyncCompareLimit: 50,
+    debug: false,
+    debugWindow: false,
+};
+
+module.exports = config;

apps/visual-regression/backstop_data/engine_scripts/cookies.json

@@ -0,0 +1,14 @@
+[
+  {
+    "domain": ".www.yourdomain.com",
+    "path": "/",
+    "name": "yourCookieName",
+    "value": "yourCookieValue",
+    "expirationDate": 1798790400,
+    "hostOnly": false,
+    "httpOnly": false,
+    "secure": false,
+    "session": false,
+    "sameSite": "Lax"
+  }
+]

apps/visual-regression/backstop_data/engine_scripts/playwright/clickAndHoverHelper.js

@@ -0,0 +1,43 @@
+module.exports = async (page, scenario) => {
+  const hoverSelector = scenario.hoverSelectors || scenario.hoverSelector;
+  const clickSelector = scenario.clickSelectors || scenario.clickSelector;
+  const keyPressSelector = scenario.keyPressSelectors || scenario.keyPressSelector;
+  const scrollToSelector = scenario.scrollToSelector;
+  const postInteractionWait = scenario.postInteractionWait; // selector [str] | ms [int]
+
+  if (keyPressSelector) {
+    for (const keyPressSelectorItem of [].concat(keyPressSelector)) {
+      await page.waitForSelector(keyPressSelectorItem.selector);
+      await page.type(keyPressSelectorItem.selector, keyPressSelectorItem.keyPress);
+    }
+  }
+
+  if (hoverSelector) {
+    for (const hoverSelectorIndex of [].concat(hoverSelector)) {
+      await page.waitForSelector(hoverSelectorIndex);
+      await page.hover(hoverSelectorIndex);
+    }
+  }
+
+  if (clickSelector) {
+    for (const clickSelectorIndex of [].concat(clickSelector)) {
+      await page.waitForSelector(clickSelectorIndex);
+      await page.click(clickSelectorIndex);
+    }
+  }
+
+  if (postInteractionWait) {
+    if (parseInt(postInteractionWait) > 0) {
+      await page.waitForTimeout(postInteractionWait);
+    } else {
+      await page.waitForSelector(postInteractionWait);
+    }
+  }
+
+  if (scrollToSelector) {
+    await page.waitForSelector(scrollToSelector);
+    await page.evaluate(scrollToSelector => {
+      document.querySelector(scrollToSelector).scrollIntoView();
+    }, scrollToSelector);
+  }
+};

apps/visual-regression/backstop_data/engine_scripts/playwright/interceptImages.js

@@ -0,0 +1,31 @@
+/**
+ * INTERCEPT IMAGES
+ * Listen to all requests. If a request matches IMAGE_URL_RE
+ * then stub the image with data from IMAGE_STUB_URL
+ *
+ * Use this in an onBefore script E.G.
+  ```
+  module.exports = async function(page, scenario) {
+    require('./interceptImages')(page, scenario);
+  }
+  ```
+ *
+ */
+
+const fs = require('fs');
+const path = require('path');
+
+const IMAGE_URL_RE = /\.gif|\.jpg|\.png/i;
+const IMAGE_STUB_URL = path.resolve(__dirname, '../../imageStub.jpg');
+const IMAGE_DATA_BUFFER = fs.readFileSync(IMAGE_STUB_URL);
+const HEADERS_STUB = {};
+
+module.exports = async function (page, scenario) {
+  page.route(IMAGE_URL_RE, route => {
+    route.fulfill({
+      body: IMAGE_DATA_BUFFER,
+      headers: HEADERS_STUB,
+      status: 200
+    });
+  });
+};

apps/visual-regression/backstop_data/engine_scripts/playwright/loadCookies.js

@@ -0,0 +1,16 @@
+const fs = require('fs');
+
+module.exports = async (browserContext, scenario) => {
+  let cookies = [];
+  const cookiePath = scenario.cookiePath;
+
+  // Read Cookies from File, if exists
+  if (fs.existsSync(cookiePath)) {
+    cookies = JSON.parse(fs.readFileSync(cookiePath));
+  }
+
+  // Add cookies to browser
+  browserContext.addCookies(cookies);
+
+  console.log('Cookie state restored with:', JSON.stringify(cookies, null, 2));
+};

apps/visual-regression/backstop_data/engine_scripts/playwright/onBefore.js

@@ -0,0 +1,3 @@
+module.exports = async (page, scenario, viewport, isReference, browserContext) => {
+  await require('./loadCookies')(browserContext, scenario);
+};

apps/visual-regression/backstop_data/engine_scripts/playwright/onReady.js

@@ -0,0 +1,6 @@
+module.exports = async (page, scenario, viewport, isReference, browserContext) => {
+  console.log('SCENARIO > ' + scenario.label);
+  await require('./clickAndHoverHelper')(page, scenario);
+
+  // add more ready handlers here...
+};

apps/visual-regression/backstop_data/engine_scripts/playwright/overrideCSS.js

@@ -0,0 +1,27 @@
+/**
+ * OVERRIDE CSS
+ * Apply this CSS to the loaded page, as a way to override styles.
+ *
+ * Use this in an onReady script E.G.
+  ```
+  module.exports = async function(page, scenario) {
+    await require('./overrideCSS')(page, scenario);
+  }
+  ```
+ *
+ */
+
+const BACKSTOP_TEST_CSS_OVERRIDE = `
+  html {
+    background-image: none;
+  }
+`;
+
+module.exports = async (page, scenario) => {
+  // inject arbitrary css to override styles
+  await page.addStyleTag({
+    content: BACKSTOP_TEST_CSS_OVERRIDE
+  });
+
+  console.log('BACKSTOP_TEST_CSS_OVERRIDE injected for: ' + scenario.label);
+};

apps/visual-regression/backstop_data/engine_scripts/puppet/clickAndHoverHelper.js

@@ -0,0 +1,39 @@
+module.exports = async (page, scenario) => {
+  const hoverSelector = scenario.hoverSelectors || scenario.hoverSelector;
+  const clickSelector = scenario.clickSelectors || scenario.clickSelector;
+  const keyPressSelector = scenario.keyPressSelectors || scenario.keyPressSelector;
+  const scrollToSelector = scenario.scrollToSelector;
+  const postInteractionWait = scenario.postInteractionWait; // selector [str] | ms [int]
+
+  if (keyPressSelector) {
+    for (const keyPressSelectorItem of [].concat(keyPressSelector)) {
+      await page.waitForSelector(keyPressSelectorItem.selector);
+      await page.type(keyPressSelectorItem.selector, keyPressSelectorItem.keyPress);
+    }
+  }
+
+  if (hoverSelector) {
+    for (const hoverSelectorIndex of [].concat(hoverSelector)) {
+      await page.waitForSelector(hoverSelectorIndex);
+      await page.hover(hoverSelectorIndex);
+    }
+  }
+
+  if (clickSelector) {
+    for (const clickSelectorIndex of [].concat(clickSelector)) {
+      await page.waitForSelector(clickSelectorIndex);
+      await page.click(clickSelectorIndex);
+    }
+  }
+
+  if (postInteractionWait) {
+    await page.waitForTimeout(postInteractionWait);
+  }
+
+  if (scrollToSelector) {
+    await page.waitForSelector(scrollToSelector);
+    await page.evaluate(scrollToSelector => {
+      document.querySelector(scrollToSelector).scrollIntoView();
+    }, scrollToSelector);
+  }
+};

apps/visual-regression/backstop_data/engine_scripts/puppet/ignoreCSP.js

@@ -0,0 +1,65 @@
+/**
+ * IGNORE CSP HEADERS
+ * Listen to all requests. If a request matches scenario.url
+ * then fetch the request again manually, strip out CSP headers
+ * and respond to the original request without CSP headers.
+ * Allows `ignoreHTTPSErrors: true` BUT... requires `debugWindow: true`
+ *
+ * see https://github.com/GoogleChrome/puppeteer/issues/1229#issuecomment-380133332
+ * this is the workaround until Page.setBypassCSP lands... https://github.com/GoogleChrome/puppeteer/pull/2324
+ *
+ * @param      {REQUEST}  request
+ * @return     {VOID}
+ *
+ * Use this in an onBefore script E.G.
+  ```
+  module.exports = async function(page, scenario) {
+    require('./removeCSP')(page, scenario);
+  }
+  ```
+ *
+ */
+
+const fetch = require('node-fetch');
+const https = require('https');
+const agent = new https.Agent({
+  rejectUnauthorized: false
+});
+
+module.exports = async function (page, scenario) {
+  const intercept = async (request, targetUrl) => {
+    const requestUrl = request.url();
+
+    // FIND TARGET URL REQUEST
+    if (requestUrl === targetUrl) {
+      const cookiesList = await page.cookies(requestUrl);
+      const cookies = cookiesList.map(cookie => `${cookie.name}=${cookie.value}`).join('; ');
+      const headers = Object.assign(request.headers(), { cookie: cookies });
+      const options = {
+        headers,
+        body: request.postData(),
+        method: request.method(),
+        follow: 20,
+        agent
+      };
+
+      const result = await fetch(requestUrl, options);
+
+      const buffer = await result.buffer();
+      const cleanedHeaders = result.headers._headers || {};
+      cleanedHeaders['content-security-policy'] = '';
+      await request.respond({
+        body: buffer,
+        headers: cleanedHeaders,
+        status: result.status
+      });
+    } else {
+      request.continue();
+    }
+  };
+
+  await page.setRequestInterception(true);
+  page.on('request', req => {
+    intercept(req, scenario.url);
+  });
+};

apps/visual-regression/backstop_data/engine_scripts/puppet/interceptImages.js

@@ -0,0 +1,37 @@
+/**
+ * INTERCEPT IMAGES
+ * Listen to all requests. If a request matches IMAGE_URL_RE
+ * then stub the image with data from IMAGE_STUB_URL
+ *
+ * Use this in an onBefore script E.G.
+  ```
+  module.exports = async function(page, scenario) {
+    require('./interceptImages')(page, scenario);
+  }
+  ```
+ *
+ */
+
+const fs = require('fs');
+const path = require('path');
+
+const IMAGE_URL_RE = /\.gif|\.jpg|\.png/i;
+const IMAGE_STUB_URL = path.resolve(__dirname, '../imageStub.jpg');
+const IMAGE_DATA_BUFFER = fs.readFileSync(IMAGE_STUB_URL);
+const HEADERS_STUB = {};
+
+module.exports = async function (page, scenario) {
+  const intercept = async (request, targetUrl) => {
+    if (IMAGE_URL_RE.test(request.url())) {
+      await request.respond({
+        body: IMAGE_DATA_BUFFER,
+        headers: HEADERS_STUB,
+        status: 200
+      });
+    } else {
+      request.continue();
+    }
+  };
+  await page.setRequestInterception(true);
+  page.on('request', intercept);
+};

apps/visual-regression/backstop_data/engine_scripts/puppet/loadCookies.js

@@ -0,0 +1,33 @@
+const fs = require('fs');
+
+module.exports = async (page, scenario) => {
+  let cookies = [];
+  const cookiePath = scenario.cookiePath;
+
+  // READ COOKIES FROM FILE IF EXISTS
+  if (fs.existsSync(cookiePath)) {
+    cookies = JSON.parse(fs.readFileSync(cookiePath));
+  }
+
+  // MUNGE COOKIE DOMAIN
+  cookies = cookies.map(cookie => {
+    if (cookie.domain.startsWith('http://') || cookie.domain.startsWith('https://')) {
+      cookie.url = cookie.domain;
+    } else {
+      cookie.url = 'https://' + cookie.domain;
+    }
+    delete cookie.domain;
+    return cookie;
+  });
+
+  // SET COOKIES
+  const setCookies = async () => {
+    return Promise.all(
+      cookies.map(async (cookie) => {
+        await page.setCookie(cookie);
+      })
+    );
+  };
+  await setCookies();
+  console.log('Cookie state restored with:', JSON.stringify(cookies, null, 2));
+};

apps/visual-regression/backstop_data/engine_scripts/puppet/onBefore.js

@@ -0,0 +1,3 @@
+module.exports = async (page, scenario, vp) => {
+  await require('./loadCookies')(page, scenario);
+};

apps/visual-regression/backstop_data/engine_scripts/puppet/onReady.js

@@ -0,0 +1,6 @@
+module.exports = async (page, scenario, vp) => {
+  console.log('SCENARIO > ' + scenario.label);
+  await require('./clickAndHoverHelper')(page, scenario);
+
+  // add more ready handlers here...
+};