// 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.

// @dart = 2.8

import 'dart:async';

import 'package:fake_async/fake_async.dart';
import 'package:flutter_tools/src/base/common.dart';
import 'package:flutter_tools/src/base/io.dart' as io;
import 'package:flutter_tools/src/base/logger.dart';
import 'package:flutter_tools/src/convert.dart';
import 'package:flutter_tools/src/device.dart';
import 'package:flutter_tools/src/version.dart';
import 'package:flutter_tools/src/vmservice.dart';
import 'package:test/fake.dart';
import 'package:vm_service/vm_service.dart' as vm_service;

import '../src/common.dart';
import '../src/context.dart' hide testLogger;
import '../src/fake_vm_services.dart';

final Map<String, Object> vm = <String, dynamic>{
  'type': 'VM',
  'name': 'vm',
  'architectureBits': 64,
  'targetCPU': 'x64',
  'hostCPU': '      Intel(R) Xeon(R) CPU    E5-1650 v2 @ 3.50GHz',
  'version': '2.1.0-dev.7.1.flutter-45f9462398 (Fri Oct 19 19:27:56 2018 +0000) on "linux_x64"',
  '_profilerMode': 'Dart',
  '_nativeZoneMemoryUsage': 0,
  'pid': 103707,
  'startTime': 1540426121876,
  '_embedder': 'Flutter',
  '_maxRSS': 312614912,
  '_currentRSS': 33091584,
  'isolates': <dynamic>[
    <String, dynamic>{
      'type': '@Isolate',
      'fixedId': true,
      'id': 'isolates/242098474',
      'name': 'main.dart:main()',
      'number': 242098474,
    },
  ],
};

const String kExtensionName = 'ext.flutter.test.interestingExtension';

final vm_service.Isolate isolate = vm_service.Isolate(
  id: '1',
  pauseEvent: vm_service.Event(
    kind: vm_service.EventKind.kResume,
    timestamp: 0
  ),
  breakpoints: <vm_service.Breakpoint>[],
  exceptionPauseMode: null,
  libraries: <vm_service.LibraryRef>[
    vm_service.LibraryRef(
      id: '1',
      uri: 'file:///hello_world/main.dart',
      name: '',
    ),
  ],
  livePorts: 0,
  name: 'test',
  number: '1',
  pauseOnExit: false,
  runnable: true,
  startTime: 0,
  isSystemIsolate: false,
  isolateFlags: <vm_service.IsolateFlag>[],
  extensionRPCs: <String>[kExtensionName],
);

final FlutterView fakeFlutterView = FlutterView(
  id: 'a',
  uiIsolate: isolate,
);

final FakeVmServiceRequest listViewsRequest = FakeVmServiceRequest(
  method: kListViewsMethod,
  jsonResponse: <String, Object>{
    'views': <Object>[
      fakeFlutterView.toJson(),
    ],
  },
);

typedef ServiceCallback = Future<Map<String, dynamic>> Function(Map<String, Object>);

void main() {
  testWithoutContext('VmService registers reloadSources', () async {
    Future<void> reloadSources(String isolateId, { bool pause, bool force}) async {}

    final MockVMService mockVMService = MockVMService();
    await setUpVmService(
      reloadSources,
      null,
      null,
      null,
      null,
      null,
      mockVMService,
    );

    expect(mockVMService.services, containsPair('reloadSources', 'Flutter Tools'));
  });

  testWithoutContext('VmService registers flutterMemoryInfo service', () async {
    final FakeDevice mockDevice = FakeDevice();

    final MockVMService mockVMService = MockVMService();
    await setUpVmService(
      null,
      null,
      null,
      mockDevice,
      null,
      null,
      mockVMService,
    );

    expect(mockVMService.services, containsPair('flutterMemoryInfo', 'Flutter Tools'));
  });

  testWithoutContext('VmService registers flutterGetSkSL service', () async {
    final MockVMService mockVMService = MockVMService();
    await setUpVmService(
      null,
      null,
      null,
      null,
      () async => 'hello',
      null,
      mockVMService,
    );

    expect(mockVMService.services, containsPair('flutterGetSkSL', 'Flutter Tools'));
  });

  testWithoutContext('VmService throws tool exit on service registration failure.', () async {
    final MockVMService mockVMService = MockVMService()
      ..errorOnRegisterService = true;

    await expectLater(() async => setUpVmService(
      null,
      null,
      null,
      null,
      () async => 'hello',
      null,
      mockVMService,
    ), throwsToolExit());
  });

  testWithoutContext('VmService throws tool exit on service registration failure with awaited future.', () async {
    final MockVMService mockVMService = MockVMService()
      ..errorOnRegisterService = true;

    await expectLater(() async => setUpVmService(
      null,
      null,
      null,
      null,
      () async => 'hello',
      (vm_service.Event event) { },
      mockVMService,
    ), throwsToolExit());
  });

  testWithoutContext('VmService registers flutterPrintStructuredErrorLogMethod', () async {
    final MockVMService mockVMService = MockVMService();
    await setUpVmService(
      null,
      null,
      null,
      null,
      null,
      (vm_service.Event event) async => 'hello',
      mockVMService,
    );
    expect(mockVMService.listenedStreams, contains(vm_service.EventStreams.kExtension));
  });

  testWithoutContext('VMService returns correct FlutterVersion', () async {
    final MockVMService mockVMService = MockVMService();
    await setUpVmService(
      null,
      null,
      null,
      null,
      null,
      null,
      mockVMService,
    );

    expect(mockVMService.services, containsPair('flutterVersion', 'Flutter Tools'));
  });

  testUsingContext('VMService prints messages for connection failures', () {
    final BufferLogger logger = BufferLogger.test();
    FakeAsync().run((FakeAsync time) {
      final Uri uri = Uri.parse('ws://127.0.0.1:12345/QqL7EFEDNG0=/ws');
      unawaited(connectToVmService(uri, logger: logger));

      time.elapse(const Duration(seconds: 5));
      expect(logger.statusText, isEmpty);

      time.elapse(const Duration(minutes: 2));

      final String statusText = logger.statusText;
      expect(
        statusText,
        containsIgnoringWhitespace('Connecting to the VM Service is taking longer than expected...'),
      );
      expect(
        statusText,
        containsIgnoringWhitespace('try re-running with --host-vmservice-port'),
      );
      expect(
        statusText,
        containsIgnoringWhitespace('Exception attempting to connect to the VM Service:'),
      );
      expect(
        statusText,
        containsIgnoringWhitespace('This was attempt #50. Will retry'),
      );
    });
  }, overrides: <Type, Generator>{
    WebSocketConnector: () => failingWebSocketConnector,
  });

  testWithoutContext('setAssetDirectory forwards arguments correctly', () async {
    final Completer<String> completer = Completer<String>();
    final vm_service.VmService  vmService = vm_service.VmService(
      const Stream<String>.empty(),
      completer.complete,
    );
    final FlutterVmService flutterVmService = FlutterVmService(vmService);

    unawaited(flutterVmService.setAssetDirectory(
      assetsDirectory: Uri(path: 'abc', scheme: 'file'),
      viewId: 'abc',
      uiIsolateId: 'def',
    ));

    final Map<String, Object> rawRequest = json.decode(await completer.future) as Map<String, Object>;

    expect(rawRequest, allOf(<Matcher>[
      containsPair('method', kSetAssetBundlePathMethod),
      containsPair('params', allOf(<Matcher>[
        containsPair('viewId', 'abc'),
        containsPair('assetDirectory', '/abc'),
        containsPair('isolateId', 'def'),
      ]))
    ]));
  });

  testWithoutContext('getSkSLs forwards arguments correctly', () async {
    final Completer<String> completer = Completer<String>();
    final vm_service.VmService  vmService = vm_service.VmService(
      const Stream<String>.empty(),
      completer.complete,
    );
    final FlutterVmService flutterVmService = FlutterVmService(vmService);

    unawaited(flutterVmService.getSkSLs(
      viewId: 'abc',
    ));

    final Map<String, Object> rawRequest = json.decode(await completer.future) as Map<String, Object>;

    expect(rawRequest, allOf(<Matcher>[
      containsPair('method', kGetSkSLsMethod),
      containsPair('params', allOf(<Matcher>[
        containsPair('viewId', 'abc'),
      ]))
    ]));
  });

  testWithoutContext('flushUIThreadTasks forwards arguments correctly', () async {
    final Completer<String> completer = Completer<String>();
    final vm_service.VmService vmService = vm_service.VmService(
      const Stream<String>.empty(),
      completer.complete,
    );
    final FlutterVmService flutterVmService = FlutterVmService(vmService);

    unawaited(flutterVmService.flushUIThreadTasks(
      uiIsolateId: 'def',
    ));

    final Map<String, Object> rawRequest = json.decode(await completer.future) as Map<String, Object>;

    expect(rawRequest, allOf(<Matcher>[
      containsPair('method', kFlushUIThreadTasksMethod),
      containsPair('params', allOf(<Matcher>[
        containsPair('isolateId', 'def'),
      ]))
    ]));
  });

  testWithoutContext('runInView forwards arguments correctly', () async {
    final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(
      requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(method: 'streamListen', args: <String, Object>{
          'streamId': 'Isolate'
        }),
        const FakeVmServiceRequest(method: kRunInViewMethod, args: <String, Object>{
          'viewId': '1234',
          'mainScript': 'main.dart',
          'assetDirectory': 'flutter_assets/',
        }),
        FakeVmServiceStreamResponse(
          streamId: 'Isolate',
          event: vm_service.Event(
            kind: vm_service.EventKind.kIsolateRunnable,
            timestamp: 1,
          )
        ),
      ]
    );

    await fakeVmServiceHost.vmService.runInView(
      viewId: '1234',
      main: Uri.file('main.dart'),
      assetsDirectory: Uri.file('flutter_assets/'),
    );
    expect(fakeVmServiceHost.hasRemainingExpectations, false);
  });

  testWithoutContext('flutterDebugDumpSemanticsTreeInTraversalOrder handles missing method', () async {
    final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(
      requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: 'ext.flutter.debugDumpSemanticsTreeInTraversalOrder',
          args: <String, Object>{
            'isolateId': '1'
          },
          errorCode: RPCErrorCodes.kMethodNotFound,
        ),
      ]
    );

    expect(await fakeVmServiceHost.vmService.flutterDebugDumpSemanticsTreeInTraversalOrder(
      isolateId: '1',
    ), '');
    expect(fakeVmServiceHost.hasRemainingExpectations, false);
  });

  testWithoutContext('flutterDebugDumpSemanticsTreeInInverseHitTestOrder handles missing method', () async {
    final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(
      requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: 'ext.flutter.debugDumpSemanticsTreeInInverseHitTestOrder',
          args: <String, Object>{
            'isolateId': '1'
          },
          errorCode: RPCErrorCodes.kMethodNotFound,
        ),
      ]
    );

    expect(await fakeVmServiceHost.vmService.flutterDebugDumpSemanticsTreeInInverseHitTestOrder(
      isolateId: '1',
    ), '');
    expect(fakeVmServiceHost.hasRemainingExpectations, false);
  });

  testWithoutContext('flutterDebugDumpLayerTree handles missing method', () async {
    final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(
      requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: 'ext.flutter.debugDumpLayerTree',
          args: <String, Object>{
            'isolateId': '1'
          },
          errorCode: RPCErrorCodes.kMethodNotFound,
        ),
      ]
    );

    expect(await fakeVmServiceHost.vmService.flutterDebugDumpLayerTree(
      isolateId: '1',
    ), '');
    expect(fakeVmServiceHost.hasRemainingExpectations, false);
  });

  testWithoutContext('flutterDebugDumpRenderTree handles missing method', () async {
    final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(
      requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: 'ext.flutter.debugDumpRenderTree',
          args: <String, Object>{
            'isolateId': '1'
          },
          errorCode: RPCErrorCodes.kMethodNotFound,
        ),
      ]
    );

    expect(await fakeVmServiceHost.vmService.flutterDebugDumpRenderTree(
      isolateId: '1',
    ), '');
    expect(fakeVmServiceHost.hasRemainingExpectations, false);
  });

  testWithoutContext('flutterDebugDumpApp handles missing method', () async {
    final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(
      requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: 'ext.flutter.debugDumpApp',
          args: <String, Object>{
            'isolateId': '1'
          },
          errorCode: RPCErrorCodes.kMethodNotFound,
        ),
      ]
    );

    expect(await fakeVmServiceHost.vmService.flutterDebugDumpApp(
      isolateId: '1',
    ), '');
    expect(fakeVmServiceHost.hasRemainingExpectations, false);
  });

  testWithoutContext('Framework service extension invocations return null if service disappears ', () async {
    final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(
      requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: kGetSkSLsMethod,
          args: <String, Object>{
            'viewId': '1234',
          },
          errorCode: RPCErrorCodes.kServiceDisappeared,
        ),
        const FakeVmServiceRequest(
          method: kListViewsMethod,
          errorCode: RPCErrorCodes.kServiceDisappeared,
        ),
        const FakeVmServiceRequest(
          method: kScreenshotMethod,
          errorCode: RPCErrorCodes.kServiceDisappeared,
        ),
        const FakeVmServiceRequest(
          method: kScreenshotSkpMethod,
          errorCode: RPCErrorCodes.kServiceDisappeared,
        ),
        const FakeVmServiceRequest(
          method: 'setVMTimelineFlags',
          args: <String, dynamic>{
            'recordedStreams': <String>['test'],
          },
          errorCode: RPCErrorCodes.kServiceDisappeared,
        ),
        const FakeVmServiceRequest(
          method: 'getVMTimeline',
          errorCode: RPCErrorCodes.kServiceDisappeared,
        ),
      ]
    );

    final Map<String, Object> skSLs = await fakeVmServiceHost.vmService.getSkSLs(
      viewId: '1234',
    );
    expect(skSLs, isNull);

    final List<FlutterView> views = await fakeVmServiceHost.vmService.getFlutterViews();
    expect(views, isEmpty);

    final vm_service.Response screenshot = await fakeVmServiceHost.vmService.screenshot();
    expect(screenshot, isNull);

    final vm_service.Response screenshotSkp = await fakeVmServiceHost.vmService.screenshotSkp();
    expect(screenshotSkp, isNull);

    // Checking that this doesn't throw.
    await fakeVmServiceHost.vmService.setTimelineFlags(<String>['test']);

    final vm_service.Response timeline = await fakeVmServiceHost.vmService.getTimeline();
    expect(timeline, isNull);

    expect(fakeVmServiceHost.hasRemainingExpectations, false);
  });

  testWithoutContext('getIsolateOrNull returns null if service disappears ', () async {
    final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(
      requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(method: 'getIsolate', args: <String, Object>{
          'isolateId': 'isolate/123',
        }, errorCode: RPCErrorCodes.kServiceDisappeared),
      ]
    );

    final vm_service.Isolate isolate = await fakeVmServiceHost.vmService.getIsolateOrNull(
      'isolate/123',
    );
    expect(isolate, null);

    expect(fakeVmServiceHost.hasRemainingExpectations, false);
  });

  testWithoutContext('getFlutterViews polls until a view is returned', () async {
    final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(
      requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: kListViewsMethod,
          jsonResponse: <String, Object>{
            'views': <Object>[],
          },
        ),
        const FakeVmServiceRequest(
          method: kListViewsMethod,
          jsonResponse: <String, Object>{
            'views': <Object>[],
          },
        ),
        listViewsRequest,
      ]
    );

    expect(
      await fakeVmServiceHost.vmService.getFlutterViews(
        delay: Duration.zero,
      ),
      isNotEmpty,
    );
    expect(fakeVmServiceHost.hasRemainingExpectations, false);
  });

  testWithoutContext('getFlutterViews does not poll if returnEarly is true', () async {
    final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(
      requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: kListViewsMethod,
          jsonResponse: <String, Object>{
            'views': <Object>[],
          },
        ),
      ]
    );

    expect(
      await fakeVmServiceHost.vmService.getFlutterViews(
        returnEarly: true,
      ),
      isEmpty,
    );
    expect(fakeVmServiceHost.hasRemainingExpectations, false);
  });

  group('findExtensionIsolate', () {

    testWithoutContext('returns an isolate with the registered extensionRPC', () async {
      final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: 'streamListen',
          args: <String, Object>{
            'streamId': 'Isolate',
          },
        ),
        listViewsRequest,
        FakeVmServiceRequest(
          method: 'getIsolate',
          jsonResponse: isolate.toJson(),
          args: <String, Object>{
            'isolateId': '1',
          },
        ),
        const FakeVmServiceRequest(
          method: 'streamCancel',
          args: <String, Object>{
            'streamId': 'Isolate',
          },
        ),
      ]);

      final vm_service.IsolateRef isolateRef = await fakeVmServiceHost.vmService.findExtensionIsolate(kExtensionName);
      expect(isolateRef.id, '1');
    });

    testWithoutContext('returns the isolate with the registered extensionRPC when there are multiple FlutterViews', () async {
      const String otherExtensionName = 'ext.flutter.test.otherExtension';

      // Copy the other isolate and change a few fields.
      final vm_service.Isolate isolate2 = vm_service.Isolate.parse(
        isolate.toJson()
          ..['id'] = '2'
          ..['extensionRPCs'] = <String>[otherExtensionName],
      );

      final FlutterView fakeFlutterView2 = FlutterView(
        id: '2',
        uiIsolate: isolate2,
      );

      final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: 'streamListen',
          args: <String, Object>{
            'streamId': 'Isolate',
          },
        ),
        FakeVmServiceRequest(
          method: kListViewsMethod,
          jsonResponse: <String, Object>{
            'views': <Object>[
              fakeFlutterView.toJson(),
              fakeFlutterView2.toJson(),
            ],
          },
        ),
        FakeVmServiceRequest(
          method: 'getIsolate',
          jsonResponse: isolate.toJson(),
          args: <String, Object>{
            'isolateId': '1',
          },
        ),
        FakeVmServiceRequest(
          method: 'getIsolate',
          jsonResponse: isolate2.toJson(),
          args: <String, Object>{
            'isolateId': '2',
          },
        ),
        const FakeVmServiceRequest(
          method: 'streamCancel',
          args: <String, Object>{
            'streamId': 'Isolate',
          },
        ),
      ]);

      final vm_service.IsolateRef isolateRef = await fakeVmServiceHost.vmService.findExtensionIsolate(otherExtensionName);
      expect(isolateRef.id, '2');
    });

    testWithoutContext('does not rethrow a sentinel exception if the initially queried flutter view disappears', () async {
      const String otherExtensionName = 'ext.flutter.test.otherExtension';
      final vm_service.Isolate isolate2 = vm_service.Isolate.parse(
        isolate.toJson()
          ..['id'] = '2'
          ..['extensionRPCs'] = <String>[otherExtensionName],
      );

      final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: 'streamListen',
          args: <String, Object>{
            'streamId': 'Isolate',
          },
        ),
        FakeVmServiceRequest(
          method: kListViewsMethod,
          jsonResponse: <String, Object>{
            'views': <Object>[
              fakeFlutterView.toJson(),
            ],
          },
        ),
        const FakeVmServiceRequest(
          method: 'getIsolate',
          args: <String, Object>{
            'isolateId': '1',
          },
          errorCode: RPCErrorCodes.kServiceDisappeared,
        ),
        // Assume a different isolate returns.
        FakeVmServiceStreamResponse(
          streamId: 'Isolate',
          event: vm_service.Event(
            kind: vm_service.EventKind.kServiceExtensionAdded,
            extensionRPC: otherExtensionName,
            timestamp: 1,
            isolate: isolate2,
          ),
        ),
        const FakeVmServiceRequest(
          method: 'streamCancel',
          args: <String, Object>{
            'streamId': 'Isolate',
          },
        ),
      ]);

      final vm_service.IsolateRef isolateRef = await fakeVmServiceHost.vmService.findExtensionIsolate(otherExtensionName);
      expect(isolateRef.id, '2');
    });

    testWithoutContext('when the isolate stream is already subscribed, returns an isolate with the registered extensionRPC', () async {
      final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: 'streamListen',
          args: <String, Object>{
            'streamId': 'Isolate',
          },
          // Stream already subscribed - https://github.com/dart-lang/sdk/blob/main/runtime/vm/service/service.md#streamlisten
          errorCode: 103,
        ),
        listViewsRequest,
        FakeVmServiceRequest(
          method: 'getIsolate',
          jsonResponse: isolate.toJson()..['extensionRPCs'] = <String>[kExtensionName],
          args: <String, Object>{
            'isolateId': '1',
          },
        ),
        const FakeVmServiceRequest(
          method: 'streamCancel',
          args: <String, Object>{
            'streamId': 'Isolate',
          },
        ),
      ]);

      final vm_service.IsolateRef isolateRef = await fakeVmServiceHost.vmService.findExtensionIsolate(kExtensionName);
      expect(isolateRef.id, '1');
    });

    testWithoutContext('returns an isolate with a extensionRPC that is registered later', () async {
      final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: 'streamListen',
          args: <String, Object>{
            'streamId': 'Isolate',
          },
        ),
        listViewsRequest,
        FakeVmServiceRequest(
          method: 'getIsolate',
          jsonResponse: isolate.toJson(),
          args: <String, Object>{
            'isolateId': '1',
          },
        ),
        FakeVmServiceStreamResponse(
          streamId: 'Isolate',
          event: vm_service.Event(
            kind: vm_service.EventKind.kServiceExtensionAdded,
            extensionRPC: kExtensionName,
            timestamp: 1,
          ),
        ),
        const FakeVmServiceRequest(
          method: 'streamCancel',
          args: <String, Object>{
            'streamId': 'Isolate',
          },
        ),
      ]);

      final vm_service.IsolateRef isolateRef = await fakeVmServiceHost.vmService.findExtensionIsolate(kExtensionName);
      expect(isolateRef.id, '1');
    });

    testWithoutContext('throws when the service disappears', () async {
      final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
        const FakeVmServiceRequest(
          method: 'streamListen',
          args: <String, Object>{
            'streamId': 'Isolate',
          },
        ),
        const FakeVmServiceRequest(
          method: kListViewsMethod,
          errorCode: RPCErrorCodes.kServiceDisappeared,
        ),
        const FakeVmServiceRequest(
          method: 'streamCancel',
          args: <String, Object>{
            'streamId': 'Isolate',
          },
          errorCode: RPCErrorCodes.kServiceDisappeared,
        ),
      ]);

      expect(
        () => fakeVmServiceHost.vmService.findExtensionIsolate(kExtensionName),
        throwsA(isA<VmServiceDisappearedException>()),
      );
    });
  });

  testWithoutContext('Can process log events from the vm service', () {
    final vm_service.Event event = vm_service.Event(
      bytes: base64.encode(utf8.encode('Hello There\n')),
      timestamp: 0,
      kind: vm_service.EventKind.kLogging,
    );

    expect(processVmServiceMessage(event), 'Hello There');
  });

  testUsingContext('WebSocket URL construction uses correct URI join primitives', () async {
    final Completer<String> completer = Completer<String>();
    openChannelForTesting = (String url, {io.CompressionOptions compression, Logger logger}) async {
      completer.complete(url);
      throw Exception('');
    };

    // Construct a URL that does not end in a `/`.
    await expectLater(() => connectToVmService(Uri.parse('http://localhost:8181/foo'), logger: BufferLogger.test()), throwsException);
    expect(await completer.future, 'ws://localhost:8181/foo/ws');
    openChannelForTesting = null;
  });
}

class MockVMService extends Fake implements vm_service.VmService {
  final Map<String, String> services = <String, String>{};
  final Set<String> listenedStreams = <String>{};
  bool errorOnRegisterService = false;

  @override
  void registerServiceCallback(String service, vm_service.ServiceCallback cb) {}

  @override
  Future<vm_service.Success> registerService(String service, String alias) async {
    services[service] = alias;
    if (errorOnRegisterService) {
      throw vm_service.RPCError('registerService', 1234, 'error');
    }
    return vm_service.Success();
  }

  @override
  Stream<vm_service.Event> get onExtensionEvent => const Stream<vm_service.Event>.empty();

  @override
  Future<vm_service.Success> streamListen(String streamId) async {
    listenedStreams.add(streamId);
    return vm_service.Success();
  }
}

// Unfortunately Device, despite not being immutable, has an `operator ==`.
// Until we fix that, we have to also ignore related lints here.
// ignore: avoid_implementing_value_types
class FakeDevice extends Fake implements Device { }

class FakeFlutterVersion extends Fake implements FlutterVersion {
  @override
  Map<String, Object> toJson() => const <String, Object>{'Fake': 'Version'};
}

/// A [WebSocketConnector] that always throws an [io.SocketException].
Future<io.WebSocket> failingWebSocketConnector(
  String url, {
  io.CompressionOptions compression,
  Logger logger,
}) {
  throw const io.SocketException('Failed WebSocket connection');
}