test: Break 'page.spec.js' to smaller files (#2218)

This patch breaks huge `page.spec.js` into a bunch of smaller files.

test/utils.js

@@ -0,0 +1,129 @@
+/**
+ * Copyright 2017 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const utils = module.exports = {
+  /**
+   * @param {!Page} page
+   * @param {string} frameId
+   * @param {string} url
+   */
+  attachFrame: async function(page, frameId, url) {
+    await page.evaluate(attachFrame, frameId, url);
+
+    function attachFrame(frameId, url) {
+      const frame = document.createElement('iframe');
+      frame.src = url;
+      frame.id = frameId;
+      document.body.appendChild(frame);
+      return new Promise(x => frame.onload = x);
+    }
+  },
+
+  /**
+   * @param {!Page} page
+   * @param {string} frameId
+   */
+  detachFrame: async function(page, frameId) {
+    await page.evaluate(detachFrame, frameId);
+
+    function detachFrame(frameId) {
+      const frame = document.getElementById(frameId);
+      frame.remove();
+    }
+  },
+
+  /**
+   * @param {!Page} page
+   * @param {string} frameId
+   * @param {string} url
+   */
+  navigateFrame: async function(page, frameId, url) {
+    await page.evaluate(navigateFrame, frameId, url);
+
+    function navigateFrame(frameId, url) {
+      const frame = document.getElementById(frameId);
+      frame.src = url;
+      return new Promise(x => frame.onload = x);
+    }
+  },
+
+  /**
+   * @param {!Frame} frame
+   * @param {string=} indentation
+   * @return {string}
+   */
+  dumpFrames: function(frame, indentation) {
+    indentation = indentation || '';
+    let result = indentation + frame.url().replace(/:\d{4}\//, ':<PORT>/');
+    for (const child of frame.childFrames())
+      result += '\n' + utils.dumpFrames(child, '    ' + indentation);
+    return result;
+  },
+
+  /**
+   * @param {!EventEmitter} emitter
+   * @param {string} eventName
+   * @param {number=} eventCount
+   * @return {!Promise<!Object>}
+   */
+  waitForEvents: function(emitter, eventName, eventCount = 1) {
+    let fulfill;
+    const promise = new Promise(x => fulfill = x);
+    emitter.on(eventName, onEvent);
+    return promise;
+
+    function onEvent(event) {
+      --eventCount;
+      if (eventCount)
+        return;
+      emitter.removeListener(eventName, onEvent);
+      fulfill(event);
+    }
+  },
+
+  /**
+  * @param {!Buffer} pdfBuffer
+  * @return {!Promise<!Array<!Object>>}
+  */
+  getPDFPages: async function(pdfBuffer) {
+    const PDFJS = require('pdfjs-dist');
+    PDFJS.disableWorker = true;
+    const data = new Uint8Array(pdfBuffer);
+    const doc = await PDFJS.getDocument(data);
+    const pages = [];
+    for (let i = 0; i < doc.numPages; ++i) {
+      const page = await doc.getPage(i + 1);
+      const viewport = page.getViewport(1);
+      // Viewport width and height is in PDF points, which is
+      // 1/72 of an inch.
+      pages.push({
+        width: viewport.width / 72,
+        height: viewport.height / 72,
+      });
+      page.cleanup();
+    }
+    doc.cleanup();
+    return pages;
+  },
+
+  /**
+   * @param {number} px
+   * @return {number}
+   */
+  cssPixelsToInches: function(px) {
+    return px / 96;
+  },
+};