Refactor instance tests (#2174)

Author: Anna Gringauze

dwds/test/instances/instance_inspection_common.dart renamed to dwds/test/instances/common/test_inspector.dart

@@ -8,7 +8,7 @@
 import 'package:test/test.dart';
 import 'package:vm_service/vm_service.dart';
 
-import '../fixtures/context.dart';
+import '../../fixtures/context.dart';
 
 class TestInspector {
   TestInspector(this.context);

dwds/test/instances/instance_inspection_test.dart

@@ -13,7 +13,7 @@ import 'package:vm_service/vm_service.dart';
 
 import '../fixtures/context.dart';
 import '../fixtures/project.dart';
-import 'instance_inspection_common.dart';
+import 'common/test_inspector.dart';
 
 void main() async {
   // Enable verbose logging for debugging.

dwds/test/instances/patterns_inspection_test.dart

@@ -16,7 +16,7 @@ import 'package:vm_service/vm_service.dart';
 
 import '../fixtures/context.dart';
 import '../fixtures/project.dart';
-import 'instance_inspection_common.dart';
+import 'common/test_inspector.dart';
 
 void main() async {
   // Enable verbose logging for debugging.

dwds/test/instances/record_inspection_test.dart

@@ -13,7 +13,7 @@ import 'package:vm_service/vm_service.dart';
 
 import '../fixtures/context.dart';
 import '../fixtures/project.dart';
-import 'instance_inspection_common.dart';
+import 'common/test_inspector.dart';
 
 void main() async {
   // Enable verbose logging for debugging.

dwds/test/instances/record_type_inspection_test.dart

@@ -13,7 +13,7 @@ import 'package:vm_service/vm_service.dart';
 
 import '../fixtures/context.dart';
 import '../fixtures/project.dart';
-import 'instance_inspection_common.dart';
+import 'common/test_inspector.dart';
 
 void main() async {
   // Enable verbose logging for debugging.

dwds/test/instances/type_inspection_test.dart

@@ -13,7 +13,7 @@ import 'package:vm_service/vm_service.dart';
 
 import '../fixtures/context.dart';
 import '../fixtures/project.dart';
-import 'instance_inspection_common.dart';
+import 'common/test_inspector.dart';
 
 void main() async {
   // Enable verbose logging for debugging.