diff --git a/packages/flutter_tools/test/general.shard/device_test.dart b/packages/flutter_tools/test/general.shard/device_test.dart
index 5c67089df1..2af694c2f1 100644
--- a/packages/flutter_tools/test/general.shard/device_test.dart
+++ b/packages/flutter_tools/test/general.shard/device_test.dart
@@ -15,10 +15,9 @@ import 'package:flutter_tools/src/build_info.dart';
 import 'package:flutter_tools/src/device.dart';
 import 'package:flutter_tools/src/project.dart';
 import 'package:meta/meta.dart';
-import 'package:mockito/mockito.dart';
+import 'package:test/fake.dart';
 
 import '../src/common.dart';
-import '../src/context.dart';
 import '../src/fake_devices.dart';
 
 void main() {
@@ -184,18 +183,13 @@ void main() {
         nonEphemeralOne,
         nonEphemeralTwo,
       ];
-      final MockTerminal mockTerminal = MockTerminal();
-      when(mockTerminal.stdinHasTerminal).thenReturn(true);
-      when(mockTerminal.promptForCharInput(<String>['1', '2', 'q', 'Q'],
-        displayAcceptedCharacters: false,
-        logger: anyNamed('logger'),
-        prompt: anyNamed('prompt'),
-      )).thenAnswer((Invocation invocation) async => '1');
+      final FakeTerminal terminal = FakeTerminal()
+        ..setPrompt(<String>['1', '2', 'q', 'Q'], '1');
 
       final DeviceManager deviceManager = TestDeviceManager(
         devices,
         logger: BufferLogger.test(),
-        terminal: mockTerminal,
+        terminal: terminal,
       );
       final List<Device> filtered = await deviceManager.findTargetDevices(FakeFlutterProject());
 
@@ -209,19 +203,13 @@ void main() {
         nonEphemeralOne,
         nonEphemeralTwo,
       ];
-      final MockTerminal mockTerminal = MockTerminal();
-
-      when(mockTerminal.stdinHasTerminal).thenReturn(true);
-      when(mockTerminal.promptForCharInput(<String>['1', '2', 'q', 'Q'],
-        displayAcceptedCharacters: false,
-        logger: anyNamed('logger'),
-        prompt: anyNamed('prompt'),
-      )).thenAnswer((Invocation invocation) async => '2');
+      final FakeTerminal terminal = FakeTerminal()
+        ..setPrompt(<String>['1', '2', 'q', 'Q'], '2');
 
       final DeviceManager deviceManager = TestDeviceManager(
         devices,
         logger: BufferLogger.test(),
-        terminal: mockTerminal,
+        terminal: terminal,
       );
       final List<Device> filtered = await deviceManager.findTargetDevices(FakeFlutterProject());
 
@@ -236,19 +224,13 @@ void main() {
         ephemeralTwo,
       ];
 
-      final MockTerminal mockTerminal = MockTerminal();
-
-      when(mockTerminal.stdinHasTerminal).thenReturn(true);
-      when(mockTerminal.promptForCharInput(<String>['1', '2', 'q', 'Q'],
-        displayAcceptedCharacters: false,
-        logger: anyNamed('logger'),
-        prompt: anyNamed('prompt'),
-      )).thenAnswer((Invocation invocation) async => '1');
+      final FakeTerminal terminal = FakeTerminal()
+        ..setPrompt(<String>['1', '2', 'q', 'Q'], '1');
 
       final DeviceManager deviceManager = TestDeviceManager(
         devices,
         logger: BufferLogger.test(),
-        terminal: mockTerminal,
+        terminal: terminal,
       );
       final List<Device> filtered = await deviceManager.findTargetDevices(FakeFlutterProject());
 
@@ -262,19 +244,13 @@ void main() {
         ephemeralOne,
         ephemeralTwo,
       ];
-      final MockTerminal mockTerminal = MockTerminal();
-
-      when(mockTerminal.stdinHasTerminal).thenReturn(true);
-      when(mockTerminal.promptForCharInput(<String>['1', '2', 'q', 'Q'],
-        displayAcceptedCharacters: false,
-        logger: anyNamed('logger'),
-        prompt: anyNamed('prompt'),
-      )).thenAnswer((Invocation invocation) async => '2');
+      final FakeTerminal terminal = FakeTerminal()
+        ..setPrompt(<String>['1', '2', 'q', 'Q'], '2');
 
       final DeviceManager deviceManager = TestDeviceManager(
         devices,
         logger: BufferLogger.test(),
-        terminal: mockTerminal,
+        terminal: terminal,
       );
       final List<Device> filtered = await deviceManager.findTargetDevices(FakeFlutterProject());
 
@@ -291,19 +267,13 @@ void main() {
         nonEphemeralTwo,
       ];
 
-      final MockTerminal mockTerminal = MockTerminal();
-
-      when(mockTerminal.stdinHasTerminal).thenReturn(true);
-      when(mockTerminal.promptForCharInput(<String>['1', '2', '3', '4', 'q', 'Q'],
-        displayAcceptedCharacters: false,
-        logger: anyNamed('logger'),
-        prompt: anyNamed('prompt'),
-      )).thenAnswer((Invocation invocation) async => '3');
+      final FakeTerminal terminal = FakeTerminal()
+        ..setPrompt(<String>['1', '2', '3', '4', 'q', 'Q'], '3');
 
       final DeviceManager deviceManager = TestDeviceManager(
         devices,
         logger: BufferLogger.test(),
-        terminal: mockTerminal,
+        terminal: terminal,
       );
 
       final List<Device> filtered = await deviceManager.findTargetDevices(FakeFlutterProject());
@@ -319,19 +289,13 @@ void main() {
         ephemeralTwo,
       ];
 
-      final MockTerminal mockTerminal = MockTerminal();
-
-      when(mockTerminal.stdinHasTerminal).thenReturn(true);
-      when(mockTerminal.promptForCharInput(<String>['1', '2', 'q', 'Q'],
-        displayAcceptedCharacters: false,
-        logger: anyNamed('logger'),
-        prompt: anyNamed('prompt'),
-      )).thenAnswer((Invocation invocation) async => 'q');
+      final FakeTerminal terminal = FakeTerminal()
+        ..setPrompt(<String>['1', '2', 'q', 'Q'], 'q');
 
       final DeviceManager deviceManager = TestDeviceManager(
         devices,
         logger: BufferLogger.test(),
-        terminal: mockTerminal,
+        terminal: terminal,
       );
       await expectLater(
         () async => deviceManager.findTargetDevices(FakeFlutterProject()),
@@ -429,14 +393,13 @@ void main() {
       final List<Device> devices = <Device>[
         ephemeralOne,
       ];
-      final MockDeviceDiscovery mockDeviceDiscovery = MockDeviceDiscovery();
-      when(mockDeviceDiscovery.supportsPlatform).thenReturn(true);
-      when(mockDeviceDiscovery.devices).thenAnswer((_) async => devices);
+      final MockDeviceDiscovery deviceDiscovery = MockDeviceDiscovery()
+        ..deviceValues = devices;
 
       final DeviceManager deviceManager = TestDeviceManager(
         <Device>[],
         deviceDiscoveryOverrides: <DeviceDiscovery>[
-          mockDeviceDiscovery
+          deviceDiscovery
         ],
         logger: BufferLogger.test(),
         terminal: Terminal.test(),
@@ -447,24 +410,22 @@ void main() {
       );
 
       expect(filtered.single, ephemeralOne);
-      verify(mockDeviceDiscovery.devices).called(1);
-      verifyNever(mockDeviceDiscovery.discoverDevices(timeout: anyNamed('timeout')));
+      expect(deviceDiscovery.devicesCalled, 1);
+      expect(deviceDiscovery.discoverDevicesCalled, 0);
     });
 
-    testUsingContext('refreshes device cache with a timeout', () async {
+    testWithoutContext('refreshes device cache with a timeout', () async {
       final List<Device> devices = <Device>[
         ephemeralOne,
       ];
       const Duration timeout = Duration(seconds: 2);
-      final MockDeviceDiscovery mockDeviceDiscovery = MockDeviceDiscovery();
-      when(mockDeviceDiscovery.supportsPlatform).thenReturn(true);
-      when(mockDeviceDiscovery.discoverDevices(timeout: timeout)).thenAnswer((_) async => devices);
-      when(mockDeviceDiscovery.devices).thenAnswer((_) async => devices);
+      final MockDeviceDiscovery deviceDiscovery = MockDeviceDiscovery()
+        ..deviceValues = devices;
 
       final DeviceManager deviceManager = TestDeviceManager(
         <Device>[],
         deviceDiscoveryOverrides: <DeviceDiscovery>[
-          mockDeviceDiscovery
+          deviceDiscovery
         ],
         logger: BufferLogger.test(),
         terminal: Terminal.test(),
@@ -476,13 +437,13 @@ void main() {
       );
 
       expect(filtered.single, ephemeralOne);
-      verify(mockDeviceDiscovery.devices).called(1);
-      verify(mockDeviceDiscovery.discoverDevices(timeout: anyNamed('timeout'))).called(1);
+      expect(deviceDiscovery.devicesCalled, 1);
+      expect(deviceDiscovery.discoverDevicesCalled, 1);
     });
   });
 
   group('JSON encode devices', () {
-    testUsingContext('Consistency of JSON representation', () async {
+    testWithoutContext('Consistency of JSON representation', () async {
       expect(
         // This tests that fakeDevices is a list of tuples where "second" is the
         // correct JSON representation of the "first". Actual values are irrelevant
@@ -534,8 +495,28 @@ class TestDeviceManager extends DeviceManager {
   }
 }
 
-class MockTerminal extends Mock implements AnsiTerminal {}
-class MockDeviceDiscovery extends Mock implements DeviceDiscovery {}
+class MockDeviceDiscovery extends Fake implements DeviceDiscovery {
+  int devicesCalled = 0;
+  int discoverDevicesCalled = 0;
+
+  @override
+  bool supportsPlatform = true;
+
+  List<Device> deviceValues = <Device>[];
+
+  @override
+  Future<List<Device>> get devices async {
+    devicesCalled += 1;
+    return deviceValues;
+  }
+
+  @override
+  Future<List<Device>> discoverDevices({Duration timeout}) async {
+    discoverDevicesCalled += 1;
+    return deviceValues;
+  }
+}
+
 class FakeFlutterProject extends Fake implements FlutterProject {}
 
 class LongPollingDeviceDiscovery extends PollingDeviceDiscovery {
@@ -579,3 +560,31 @@ class ThrowingPollingDeviceDiscovery extends PollingDeviceDiscovery {
   @override
   bool get canListAnything => true;
 }
+
+class FakeTerminal extends Fake implements Terminal {
+  @override
+  bool stdinHasTerminal = true;
+
+  @override
+  bool usesTerminalUi = true;
+
+  void setPrompt(List<String> characters, String result) {
+    _nextPrompt = characters;
+    _nextResult = result;
+  }
+
+  List<String> _nextPrompt;
+  String _nextResult;
+
+  @override
+  Future<String> promptForCharInput(
+    List<String> acceptedCharacters, {
+    Logger logger,
+    String prompt,
+    int defaultChoiceIndex,
+    bool displayAcceptedCharacters = true,
+  }) async {
+    expect(acceptedCharacters, _nextPrompt);
+    return _nextResult;
+  }
+}