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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This is a CLI library; we use prints as part of the interface.
// ignore_for_file: avoid_print
import 'dart:async';
import 'dart:io';
import 'package:flutter_driver/flutter_driver.dart';
import 'common.dart';
/// Adaptor to run an integration test using `flutter drive`.
///
/// To an integration test `<test_name>.dart` using `flutter drive`, put a file named
/// `<test_name>_test.dart` in the app's `test_driver` directory:
///
/// ```dart
/// import 'dart:async';
///
/// import 'package:integration_test/integration_test_driver_extended.dart';
///
/// Future<void> main() async {
/// final FlutterDriver driver = await FlutterDriver.connect();
/// await integrationDriver(
/// driver: driver,
/// onScreenshot: (String screenshotName, List<int> screenshotBytes) async {
/// return true;
/// },
/// );
/// }
/// ```
///
/// ## Parameters:
///
/// `driver` A custom driver. Defaults to `FlutterDriver.connect()`.
///
/// `onScreenshot` can be used to process the screenshots taken during the test.
/// An example could be that this callback compares the byte array against a baseline image,
/// and it returns `true` if both images are equal.
///
/// As a result, returning `false` from `onScreenshot` will make the test fail.
Future<void> integrationDriver(
{FlutterDriver? driver, ScreenshotCallback? onScreenshot}) async {
driver ??= await FlutterDriver.connect();
// Test states that it's waiting on web driver commands.
// [DriverTestMessage] is converted to string since json format causes an
// error if it's used as a message for requestData.
String jsonResponse = await driver.requestData(DriverTestMessage.pending().toString());
Response response = Response.fromJson(jsonResponse);
// Until `integration_test` returns a [WebDriverCommandType.noop], keep
// executing WebDriver commands.
while (response.data != null &&
response.data!['web_driver_command'] != null &&
response.data!['web_driver_command'] != '${WebDriverCommandType.noop}') {
final String? webDriverCommand = response.data!['web_driver_command'] as String?;
if (webDriverCommand == '${WebDriverCommandType.screenshot}') {
assert(onScreenshot != null, 'screenshot command requires an onScreenshot callback');
// Use `driver.screenshot()` method to get a screenshot of the web page.
final List<int> screenshotImage = await driver.screenshot();
final String screenshotName = response.data!['screenshot_name']! as String;
final bool screenshotSuccess = await onScreenshot!(screenshotName, screenshotImage);
if (screenshotSuccess) {
jsonResponse = await driver.requestData(DriverTestMessage.complete().toString());
} else {
jsonResponse =
await driver.requestData(DriverTestMessage.error().toString());
}
response = Response.fromJson(jsonResponse);
} else if (webDriverCommand == '${WebDriverCommandType.ack}') {
// Previous command completed ask for a new one.
jsonResponse =
await driver.requestData(DriverTestMessage.pending().toString());
response = Response.fromJson(jsonResponse);
} else {
break;
}
}
// If No-op command is sent, ask for the result of all tests.
if (response.data != null &&
response.data!['web_driver_command'] != null &&
response.data!['web_driver_command'] == '${WebDriverCommandType.noop}') {
jsonResponse = await driver.requestData(null);
response = Response.fromJson(jsonResponse);
print('result $jsonResponse');
}
if (response.data != null && response.data!['screenshots'] != null && onScreenshot != null) {
final List<dynamic> screenshots = response.data!['screenshots'] as List<dynamic>;
final List<String> failures = <String>[];
for (final dynamic screenshot in screenshots) {
final Map<String, dynamic> data = screenshot as Map<String, dynamic>;
final List<dynamic> screenshotBytes = data['bytes'] as List<dynamic>;
final String screenshotName = data['screenshotName'] as String;
bool ok = false;
try {
ok = await onScreenshot(screenshotName, screenshotBytes.cast<int>());
} catch (exception) {
throw StateError(
'Screenshot failure:\n'
'onScreenshot("$screenshotName", <bytes>) threw an exception: $exception',
);
}
if (!ok) {
failures.add(screenshotName);
}
}
if (failures.isNotEmpty) {
throw StateError('The following screenshot tests failed: ${failures.join(', ')}');
}
}
await driver.close();
if (response.allTestsPassed) {
print('All tests passed.');
exit(0);
} else {
print('Failure Details:\n${response.formattedFailureDetails}');
exit(1);
}
}