flutter/packages/flutter_tools/test/integration.shard/build_preview_test.dart

// 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.

import 'dart:io';

import 'package:file_testing/file_testing.dart';
import 'package:flutter_tools/src/base/file_system.dart';
import 'package:flutter_tools/src/base/platform.dart';
import 'package:flutter_tools/src/cache.dart';

import '../src/common.dart';
import '../src/context.dart';
import 'test_utils.dart';

void main() {
  Cache.disableLocking();

  late Directory tempDir;
  final FileSystem fs = LocalFileSystemBlockingSetCurrentDirectory();
  final String flutterBin = fs.path.join(getFlutterRoot(), 'bin', 'flutter');
  final File previewBin = fs
          .directory(getFlutterRoot())
          .childDirectory('bin')
          .childDirectory('cache')
          .childDirectory('artifacts')
          .childDirectory('flutter_preview')
          .childFile('flutter_preview.exe');

  setUp(() {
    tempDir = fs.systemTempDirectory.createTempSync('flutter_tools_preview_integration_test.');
  });

  tearDown(() {
    tryToDelete(tempDir);
    tryToDelete(previewBin);
  });

  testUsingContext('flutter build _preview creates preview device', () async {
    final ProcessResult result = await processManager.run(<String>[
      flutterBin,
      'build',
      '_preview',
      '--verbose',
    ]);

    expect(result, const ProcessResultMatcher());
    expect(
      previewBin,
      exists,
    );
  }, skip: !const LocalPlatform().isWindows); // [intended] Flutter Preview only supported on Windows currently
}