move helpers to other module

helpers.js

@@ -0,0 +1,110 @@
+/*
+Copyright 2018 New Vector Ltd
+
+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.
+*/
+
+// puppeteer helpers
+
+async function try_get_innertext(page, selector) {
+  const field = await page.$(selector);
+  if (field != null) {
+    const text_handle = await field.getProperty('innerText');
+    return await text_handle.jsonValue();
+  }
+  return null;
+}
+
+async function new_page() {
+  const page = await browser.newPage();
+  await page.setViewport({
+    width: 1280,
+    height: 800
+  });
+  return page;
+}
+
+function log_console(page) {
+  let buffer = "";
+  page.on('console', msg => {
+    buffer += msg.text() + '\n';
+  });
+  return {
+    logs() {
+      return buffer;
+    }
+  }
+}
+
+function log_xhr_requests(page) {
+  let buffer = "";
+  page.on('request', req => {
+    const type = req.resourceType();
+    if (type === 'xhr' || type === 'fetch') {
+      buffer += `${req.method()} ${req.url()} \n`;
+      if (req.method() === "POST") {
+        buffer += "  Post data: " + req.postData();
+      }
+    }
+  });
+  return {
+    logs() {
+      return buffer;
+    }
+  }
+}
+
+async function get_outer_html(element_handle) {
+  const html_handle = await element_handle.getProperty('outerHTML');
+  return await html_handle.jsonValue();
+}
+
+async function print_elements(label, elements) {
+  console.log(label, await Promise.all(elements.map(get_outer_html)));
+}
+
+async function replace_input_text(input, text) {
+  // click 3 times to select all text
+  await input.click({clickCount: 3});
+  // then remove it with backspace
+  await input.press('Backspace');
+  // and type the new text
+  await input.type(text);
+}
+
+// other helpers
+
+function rnd_int(max) {
+  return Math.ceil(Math.random()*max);
+}
+
+function riot_url(path) {
+  return riotserver + path;
+}
+
+function delay(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms));
+}
+
+module.exports = {
+  try_get_innertext,
+  new_page,
+  log_console,
+  log_xhr_requests,
+  get_outer_html,
+  print_elements,
+  replace_input_text,
+  rnd_int,
+  riot_url,
+  delay,
+}