Use file:/// style uris when passing platform to the compiler. (#116553)

* Use file:/// style uris when passing platform to the compiler.

* License header.

* Use BufferLogger.

* Don't unadvertently convert strings to regexes for matching purposes.

* Fix formatting.

* More formatting.

packages/flutter_tools/lib/src/test/web_test_compiler.dart

@@ -123,7 +123,7 @@ class WebTestCompiler {
       initializeFromDill: cachedKernelPath,
       targetModel: TargetModel.dartdevc,
       extraFrontEndOptions: extraFrontEndOptions,
-      platformDill: platformDillPath,
+      platformDill: _fileSystem.file(platformDillPath).absolute.uri.toString(),
       dartDefines: buildInfo.dartDefines,
       librariesSpec: _artifacts.getHostArtifact(HostArtifact.flutterWebLibrariesJson).uri.toString(),
       packagesPath: buildInfo.packagesPath,

packages/flutter_tools/test/general.shard/test/web_test_compiler_test.dart

@@ -0,0 +1,94 @@
+// 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 'package:file/memory.dart';
+import 'package:flutter_tools/src/artifacts.dart';
+import 'package:flutter_tools/src/base/config.dart';
+import 'package:flutter_tools/src/base/logger.dart';
+import 'package:flutter_tools/src/base/platform.dart';
+import 'package:flutter_tools/src/build_info.dart';
+import 'package:flutter_tools/src/test/web_test_compiler.dart';
+import 'package:test/expect.dart';
+
+import '../../src/context.dart';
+
+void main() {
+  testUsingContext('web test compiler issues valid compile command', () async {
+    final BufferLogger logger = BufferLogger.test();
+    final MemoryFileSystem fileSystem = MemoryFileSystem.test();
+    fileSystem.file('project/test/fake_test.dart').createSync(recursive: true);
+    fileSystem.file('build/out').createSync(recursive: true);
+    fileSystem.file('build/build/out.sources').createSync(recursive: true);
+    fileSystem.file('build/build/out.json')
+      ..createSync()
+      ..writeAsStringSync('{}');
+    fileSystem.file('build/build/out.map').createSync();
+    fileSystem.file('build/build/out.metadata').createSync();
+    final FakePlatform platform = FakePlatform(
+        environment: <String, String>{},
+    );
+    final Config config = Config(
+        Config.kFlutterSettings,
+        fileSystem: fileSystem,
+        logger: logger,
+        platform: platform,
+    );
+    final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
+      FakeCommand(command: <Pattern>[
+        'Artifact.engineDartBinary.TargetPlatform.web_javascript',
+        '--disable-dart-dev',
+        'Artifact.frontendServerSnapshotForEngineDartSdk.TargetPlatform.web_javascript',
+        '--sdk-root',
+        'HostArtifact.flutterWebSdk/',
+        '--incremental',
+        '--target=dartdevc',
+        '--experimental-emit-debug-metadata',
+        '--output-dill',
+        'build/out',
+        '--packages',
+        '.dart_tool/package_config.json',
+        '-Ddart.vm.profile=false',
+        '-Ddart.vm.product=false',
+        '--enable-asserts',
+        '--filesystem-root',
+        'project/test',
+        '--filesystem-root',
+        'build',
+        '--filesystem-scheme',
+        'org-dartlang-app',
+        '--initialize-from-dill',
+        RegExp(r'^build\/(?:[a-z0-9]{32})\.cache\.dill$'),
+        '--platform',
+        'file:///HostArtifact.webPlatformKernelFolder/ddc_outline_sound.dill',
+        '--verbosity=error',
+        '--sound-null-safety'
+      ], stdout: 'result abc\nline0\nline1\nabc\nabc build/out 0')
+    ]);
+    final WebTestCompiler compiler = WebTestCompiler(
+      logger: logger,
+      fileSystem: fileSystem,
+      platform: FakePlatform(
+        environment: <String, String>{},
+      ),
+      artifacts: Artifacts.test(),
+      processManager: processManager,
+      config: config,
+    );
+
+    const BuildInfo buildInfo = BuildInfo(
+      BuildMode.debug,
+      '',
+      treeShakeIcons: false,
+    );
+
+    await compiler.initialize(
+      projectDirectory: fileSystem.directory('project'),
+      testOutputDir: 'build',
+      testFiles: <String>['project/test/fake_test.dart'],
+      buildInfo: buildInfo,
+    );
+
+    expect(processManager.hasRemainingExpectations, isFalse);
+  });
+}

packages/flutter_tools/test/src/fake_process_manager.dart

@@ -39,7 +39,7 @@ class FakeCommand {
 
   /// The exact commands that must be matched for this [FakeCommand] to be
   /// considered correct.
-  final List<String> command;
+  final List<Pattern> command;
 
   /// The exact working directory that must be matched for this [FakeCommand] to
   /// be considered correct.
@@ -110,7 +110,15 @@ class FakeCommand {
     Map<String, String>? environment,
     Encoding? encoding,
   ) {
-    expect(command, equals(this.command));
+    expect(command.length, this.command.length);
+    for(int i = 0; i < command.length; i++) {
+      final Pattern expected = this.command[i];
+      if (expected is String) {
+        expect(command[i], expected);
+      } else {
+        expect(command[i], matches(this.command[i]));
+      }
+    }
     if (this.workingDirectory != null) {
       expect(this.workingDirectory, workingDirectory);
     }