Remove unused imports (#657)

Author: grouma

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.12.23+1
+
+* Remove unused imports. 
+
 ## 0.12.23
 
 * Add a `fold_stack_frames` field for `dart_test.yaml`. This will

analysis_options.yaml

@@ -1,5 +1,14 @@
 analyzer:
   strong-mode: true
+# Upgrade lints to errors that will break Google3
+errors:
+  unused_element: error
+  unused_import: error
+  unused_local_variable: error
+  dead_code: error
+  ### Useful to uncomment during development to remove the noise of the many
+  ### deprecated APIs.
+  # deprecated_member_use: ignore
 linter:
   rules:
     - await_only_futures

lib/src/frontend/stream_matcher.dart

@@ -8,7 +8,6 @@ import 'package:async/async.dart';
 import 'package:matcher/matcher.dart';
 
 import '../utils.dart';
-import '../backend/invoker.dart';
 import 'test_chain.dart';
 import 'async_matcher.dart';
 

lib/src/frontend/throws_matcher.dart

@@ -9,7 +9,6 @@ import 'package:matcher/matcher.dart';
 import '../utils.dart';
 import 'async_matcher.dart';
 import '../frontend/test_chain.dart';
-import '../backend/invoker.dart';
 
 /// This function is deprecated.
 ///

lib/src/runner/reporter/json.dart

@@ -13,7 +13,6 @@ import '../../backend/state.dart';
 import '../../backend/suite.dart';
 import '../../backend/test_platform.dart';
 import '../../frontend/expect.dart';
-import '../../utils.dart';
 import '../configuration.dart';
 import '../configuration/suite.dart';
 import '../engine.dart';

pubspec.yaml

@@ -1,5 +1,5 @@
 name: test
-version: 0.12.23
+version: 0.12.23+1
 author: Dart Team <[email protected]>
 description: A library for writing dart unit tests.
 homepage: https://github.com/dart-lang/test