tests/e2e/test/ermine_spinning_square_view_test.dart

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter_driver/flutter_driver.dart';
import 'package:sl4f/sl4f.dart';
import 'package:test/test.dart';

import 'ermine_driver.dart';

/// Tests that the DUT running ermine can do the following:
///  - Launch `spinning_square_view` ephemeral package.
///  - Verify it is show by taking its screenshot.
void main() {
  Sl4f sl4f;
  ErmineDriver ermine;

  setUpAll(() async {
    sl4f = Sl4f.fromEnvironment();
    await sl4f.startServer();

    ermine = ErmineDriver(sl4f);
    await ermine.setUp();
  });

  tearDownAll(() async {
    // Any of these may end up being null if the test fails in setup.
    await ermine.tearDown();
    await sl4f?.stopServer();
    sl4f?.close();
  });

  test('Verify spinning square view is shown', () async {
    const componentUrl =
        'fuchsia-pkg://fuchsia.com/spinning_square_view#meta/spinning_square_view.cmx';
    await ermine.launch(componentUrl);
    // Get the view rect.
    final viewRect = await ermine.getViewRect(componentUrl);
    // Give the view couple of seconds to draw before taking its screenshot.
    await Future.delayed(Duration(seconds: 2));
    final screenshot = await ermine.screenshot(viewRect);
    final histogram = ermine.histogram(screenshot);

    // spinning_square_view displays a red square on purple background.
    const purple = 0xffb73a67; //  (0xAABBGGRR)
    const red = 0xff5700f5; //  (0xAABBGGRR)
    expect(histogram.keys.length, 2);
    expect(histogram[purple], isNotNull);
    expect(histogram[red], isNotNull);
    expect(histogram[purple] > histogram[red], isTrue);

    // Close the view.
    await ermine.driver.requestData('close');
    // Verify the view is closed.
    await ermine.driver.waitForAbsent(find.text('spinning_square_view'));
  });
}