override Analytics in TestBed defaults (#153990)

Fixes flutter/flutter#150663

Author: andrewkolos

packages/flutter_tools/test/src/testbed.dart

@@ -19,6 +19,7 @@ import 'package:flutter_tools/src/dart/pub.dart';
 import 'package:flutter_tools/src/globals.dart' as globals;
 import 'package:flutter_tools/src/reporting/reporting.dart';
 import 'package:flutter_tools/src/version.dart';
+import 'package:unified_analytics/unified_analytics.dart';
 
 import 'context.dart';
 import 'fake_http_client.dart';
@@ -40,6 +41,7 @@ final Map<Type, Generator> _testbedDefaults = <Type, Generator>{
   OperatingSystemUtils: () => FakeOperatingSystemUtils(),
   OutputPreferences: () => OutputPreferences.test(), // configures BufferLogger to avoid color codes.
   Usage: () => TestUsage(), // prevent addition of analytics from burdening test mocks
+  Analytics: () => const NoOpAnalytics(),
   FlutterVersion: () => FakeFlutterVersion(), // prevent requirement to mock git for test runner.
   Signals: () => FakeSignals(),  // prevent registering actual signal handlers.
   Pub: () => ThrowingPub(), // prevent accidental invocations of pub.