Adding Base Tests

test_driver/main.dart

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+import 'package:flutter_piano/main.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_driver/driver_extension.dart';
+
+void main() {
+  // Enable integration testing with the Flutter Driver extension.
+  // See https://flutter.io/testing/ for more info.
+  enableFlutterDriverExtension();
+  WidgetsApp.debugAllowBannerOverride = false; // remove debug banner
+  runApp(MyApp());
+}

test_driver/main_test.dart

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+// This is a basic Flutter Driver test for the application. A Flutter Driver
+// test is an end-to-end test that "drives" your application from another
+// process or even from another computer. If you are familiar with
+// Selenium/WebDriver for web, Espresso for Android or UI Automation for iOS,
+// this is simply Flutter's version of that.
+
+import 'package:flutter_driver/flutter_driver.dart';
+import 'package:test/test.dart';
+import 'package:screenshots/config.dart';
+import 'package:screenshots/capture_screen.dart';
+
+void main() {
+  group('end-to-end test', () {
+    FlutterDriver driver;
+    final Map config = Config().config;
+
+    setUpAll(() async {
+      // Connect to a running Flutter application instance.
+      driver = await FlutterDriver.connect();
+    });
+
+    tearDownAll(() async {
+      if (driver != null) driver.close();
+    });
+
+    test('tap on the floating action button; verify counter', () async {
+      // Finds the floating action button (fab) to tap on
+      SerializableFinder fab = find.byTooltip('Increment');
+
+      // Wait for the floating action button to appear
+      await driver.waitFor(fab);
+
+      // take screenshot before number is incremented
+      await screenshot(driver, config, '0');
+
+      // Tap on the fab
+      await driver.tap(fab);
+
+      // Wait for text to change to the desired value
+      await driver.waitFor(find.text('1'));
+
+      // take screenshot after number is incremented
+      await screenshot(driver, config, '1');
+
+      // increase timeout from 30 seconds for testing
+      // on slow running emulators in cloud
+    }, timeout: Timeout(Duration(seconds: 120)));
+  });
+}