Remove unnecessary imports in tests (#135)

diff --git a/test/capture_test.dart b/test/capture_test.dart
index 8ca3606..022a730 100644
--- a/test/capture_test.dart
+++ b/test/capture_test.dart
@@ -13,7 +13,6 @@
 // limitations under the License.
 
 import 'package:mockito/mockito.dart';
-import 'package:mockito/src/mock.dart' show resetMockitoState;
 import 'package:test/test.dart';
 
 import 'utils.dart';
diff --git a/test/mockito_test.dart b/test/mockito_test.dart
index 5794740..1bc0705 100644
--- a/test/mockito_test.dart
+++ b/test/mockito_test.dart
@@ -15,8 +15,6 @@
 import 'dart:async';
 
 import 'package:mockito/mockito.dart';
-import 'package:mockito/src/mock.dart'
-    show resetMockitoState, throwOnMissingStub;
 import 'package:test/test.dart';
 
 import 'utils.dart';
diff --git a/test/until_called_test.dart b/test/until_called_test.dart
index e4c17e3..bde801e 100644
--- a/test/until_called_test.dart
+++ b/test/until_called_test.dart
@@ -15,7 +15,6 @@
 import 'dart:async';
 
 import 'package:mockito/mockito.dart';
-import 'package:mockito/src/mock.dart' show resetMockitoState;
 import 'package:test/test.dart';
 
 class RealClass {
diff --git a/test/verify_test.dart b/test/verify_test.dart
index 6945306..10d62ed 100644
--- a/test/verify_test.dart
+++ b/test/verify_test.dart
@@ -13,7 +13,6 @@
 // limitations under the License.
 
 import 'package:mockito/mockito.dart';
-import 'package:mockito/src/mock.dart' show resetMockitoState;
 import 'package:test/test.dart';
 
 import 'utils.dart';