Add spectron test for zoom functionality (#948)

spectron/fixtures/robot-actions.ts

@@ -26,6 +26,33 @@ class RobotActions {
         robot.keyToggle('f', 'up', [ 'command', 'control' ]);
     }
 
+    /**
+     * Zoom in via keyboard Command/Ctrl +
+     */
+    public zoomIn(): void {
+        const modifier = isMac ? [ 'command' ] : [ 'control' ];
+        robot.keyToggle('+', 'down', modifier);
+        robot.keyToggle('+', 'up', modifier);
+    }
+
+    /**
+     * Zoom out via keyboard
+     */
+    public zoomOut(): void {
+        const modifier = isMac ? [ 'command' ] : [ 'control' ];
+        robot.keyToggle('-', 'down', modifier);
+        robot.keyToggle('-', 'up', modifier);
+    }
+
+    /**
+     * Zoom reset via keyboard
+     */
+    public zoomReset(): void {
+        const modifier = isMac ? [ 'command' ] : [ 'control' ];
+        robot.keyToggle('0', 'down', modifier);
+        robot.keyToggle('0', 'up', modifier);
+    }
+
     /**
      * Click the App menu
      */

spectron/zoom.spec.ts

@@ -0,0 +1,42 @@
+import test from 'ava';
+import { Application } from 'spectron';
+import { robotActions } from './fixtures/robot-actions';
+
+import {
+    getDemoFilePath, loadURL,
+    sleep,
+    startApplication,
+    stopApplication,
+    Timeouts,
+} from './fixtures/spectron-setup';
+
+let app;
+
+test.before(async (t) => {
+    app = await startApplication() as Application;
+    t.true(app.isRunning());
+});
+
+test.after.always(async () => {
+    await stopApplication(app);
+});
+
+test('zoom: verify application zoom feature', async (t) => {
+    await loadURL(app, getDemoFilePath());
+    await app.client.waitUntilWindowLoaded(Timeouts.fiveSec);
+
+    robotActions.zoomIn();
+    t.is(await app.webContents.getZoomLevel(), 0.5);
+    await sleep(Timeouts.oneSec);
+
+    robotActions.zoomIn();
+    t.is(await app.webContents.getZoomLevel(), 1);
+    await sleep(Timeouts.oneSec);
+
+    robotActions.zoomOut();
+    t.is(await app.webContents.getZoomLevel(), 0.5);
+    await sleep(Timeouts.oneSec);
+
+    robotActions.zoomReset();
+    t.is(await app.webContents.getZoomLevel(), 0);
+});