Add integration test for flutter build windows (#106053)

Add an integration test that verifies that `flutter build windows` produces the expected executable. In the future, this will be used to test that version information is properly stamped on the executable.

Part of flutter/flutter#73652.

packages/flutter_tools/test/integration.shard/flutter_build_windows_test.dart

@@ -0,0 +1,116 @@
+// 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' as io;
+
+import 'package:file/file.dart';
+import 'package:file_testing/file_testing.dart';
+import 'package:flutter_tools/src/base/io.dart';
+
+import '../src/common.dart';
+import 'test_utils.dart';
+
+void main() {
+  late Directory tempDir;
+  late Directory projectRoot;
+  late String flutterBin;
+  late Directory releaseDir;
+  late File exeFile;
+
+  group('flutter build windows command', () {
+    setUpAll(() {
+      tempDir = createResolvedTempDirectorySync('build_windows_test.');
+      flutterBin = fileSystem.path.join(
+        getFlutterRoot(),
+        'bin',
+        'flutter',
+      );
+      processManager.runSync(<String>[flutterBin, 'config',
+        '--enable-windows-desktop',
+      ]);
+
+      processManager.runSync(<String>[
+        flutterBin,
+        ...getLocalEngineArguments(),
+        'create',
+        'hello',
+      ], workingDirectory: tempDir.path);
+
+      projectRoot = tempDir.childDirectory('hello');
+
+      releaseDir = fileSystem.directory(fileSystem.path.join(
+        projectRoot.path,
+        'build',
+        'windows',
+        'runner',
+        'Release',
+      ));
+
+      exeFile = fileSystem.file(fileSystem.path.join(
+        releaseDir.path,
+        'hello.exe',
+      ));
+    });
+
+    tearDownAll(() {
+      tryToDelete(tempDir);
+    });
+
+    testWithoutContext('flutter build windows creates exe', () {
+      final ProcessResult result = processManager.runSync(<String>[
+        flutterBin,
+        ...getLocalEngineArguments(),
+        'build',
+        'windows',
+        '--no-pub',
+      ], workingDirectory: projectRoot.path);
+
+      expect(result.exitCode, 0);
+      expect(releaseDir, exists);
+      expect(exeFile, exists);
+
+      // Default exe has version 1.0.0
+      final String fileVersion = _getFileVersion(exeFile);
+      final String productVersion = _getProductVersion(exeFile);
+
+      expect(fileVersion, equals('1.0.0.0'));
+      expect(productVersion, equals('1.0.0'));
+    });
+  }, skip: !io.Platform.isWindows); // [intended] Windows integration build.
+}
+
+String _getFileVersion(File file) {
+  // FileVersionInfo's FileVersion property excludes the private part,
+  // so this recreates the file version using the individual parts.
+  final ProcessResult result = Process.runSync(
+    'powershell.exe -command " '
+    '\$v = [System.Diagnostics.FileVersionInfo]::GetVersionInfo(\\"${file.path}\\"); '
+    r'Write-Output \"$($v.FileMajorPart).$($v.FileMinorPart).$($v.FileBuildPart).$($v.FilePrivatePart)\" '
+    '"',
+    <String>[]
+  );
+
+  if (result.exitCode != 0) {
+    throw Exception('GetVersionInfo failed.');
+  }
+
+  // Trim trailing new line.
+  final String output = result.stdout as String;
+  return output.trim();
+}
+
+String _getProductVersion(File file) {
+  final ProcessResult result = Process.runSync(
+    'powershell.exe -command "[System.Diagnostics.FileVersionInfo]::GetVersionInfo(\\"${file.path}\\").ProductVersion"',
+    <String>[]
+  );
+
+  if (result.exitCode != 0) {
+    throw Exception('GetVersionInfo failed.');
+  }
+
+  // Trim trailing new line.
+  final String output = result.stdout as String;
+  return output.trim();
+}