Integration test: tape + spectron hello world

test/setup.js

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+const path = require('path')
+const Application = require('spectron').Application
+const fs = require('fs-extra')
+
+const TEST_DATA_DIR = path.join(__dirname, 'tempTestData')
+
+module.exports = {
+  TEST_DATA_DIR,
+  createApp,
+  endTest,
+  screenshotCreateOrCompare,
+  waitForLoad,
+  wait
+}
+
+// Runs WebTorrent Desktop.
+// Returns a promise that resolves to a Spectron Application once the app has loaded.
+// Takes a Tape test. Makes some basic assertions to verify that the app loaded correctly.
+function createApp (t) {
+  return new Application({
+    path: path.join(__dirname, '..', 'node_modules', '.bin',
+      'electron' + (process.platform === 'win32' ? '.cmd' : '')),
+    args: [path.join(__dirname, '..')],
+    env: {NODE_ENV: 'test'}
+  })
+}
+
+// Starts the app, waits for it to load, returns a promise
+function waitForLoad (app, t) {
+  return app.start().then(function () {
+    return app.client.windowByIndex(1)
+  }).then(function () {
+    return app.client.waitUntilWindowLoaded()
+  }).then(function () {
+    return app.webContents.getTitle()
+  }).then(function (title) {
+    t.equal(title, 'WebTorrent Desktop', 'app title')
+  })
+}
+
+function wait (ms) {
+  if (ms === undefined) ms = 500 // Default: wait long enough for the UI to update
+  return new Promise(function (resolve, reject) {
+    setTimeout(resolve, ms)
+  })
+}
+
+function endTest (app, t, err) {
+  return app.stop().then(function () {
+    t.end(err)
+  })
+}
+
+function screenshotCreateOrCompare (app, t, name) {
+  const ssPath = path.join(__dirname, 'screenshots', process.platform, name + '.png')
+  console.log('Capturing ' + ssPath)
+  fs.ensureFileSync(ssPath)
+  const ssBuf = fs.readFileSync(ssPath)
+  return app.browserWindow.capturePage().then(function (buffer) {
+    if (ssBuf.length === 0) {
+      console.log('Saving screenshot ' + ssPath)
+      fs.writeFileSync(ssPath, buffer)
+    } else if (Buffer.compare(buffer, ssBuf) !== 0) {
+      return Promise.reject('Screenshot didn\'t match: ' + ssPath)
+    } else {
+      return Promise.resolve()
+    }
+  })
+}