integration tests via spectron

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

spec/integration/helpers/utils.ts

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+import { Application } from "spectron";
+import * as path from "path"
+
+let appPath = ""
+switch(process.platform) {
+case "win32": {
+  appPath = path.join("./dist/win-unpacked/Lens.exe")
+}
+case "linux": {
+  appPath = path.join("./dist/linux-unpacked/kontena-lens")
+}
+case "darwin": {
+  appPath = path.join("./dist/mac/LensDev.app/Contents/MacOS/LensDev")
+}
+}
+
+export function setup() {
+  return new Application({
+    // path to electron app
+    args: [],
+    path: appPath,
+    startTimeout: 30000,
+    waitTimeout: 30000,
+  })
+}
+
+export async function tearDown(app: Application) {
+  const pid = app.mainProcess.pid
+  await app.stop()
+  try {
+    process.kill(pid, 0);
+  } catch(e) {
+    return
+  }
+}

spec/integration/specs/app_spec.ts

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+import { Application } from "spectron"
+import * as util from "../helpers/utils"
+
+describe("app start", () => {
+  let app: Application
+  beforeEach(() => {
+    app = util.setup()
+    return app.start()
+  }, 20000)
+
+  it('starts with whats new flow', async () => {
+    await app.client.windowByIndex(1)
+    await app.client.waitUntilWindowLoaded()
+    await app.client.waitUntilTextExists("h1", "What's new")
+    await app.client.click("button.btn-primary")
+    await app.client.waitUntilTextExists("h1", "Welcome")
+  })
+
+  afterEach(async () => {
+    if (app && app.isRunning()) {
+      return util.tearDown(app)
+    }
+  })
+})