Add an integration test for execution.setSubscriptions.

pkg/analysis_server/test/integration/execution/test_all.dart

Index: pkg/analysis_server/test/integration/execution/test_all.dart
diff --git a/pkg/analysis_server/test/integration/execution/test_all.dart b/pkg/analysis_server/test/integration/execution/test_all.dart
index f24942d07c881b9a01e220c149444dff871e34c7..cf57ba83723a3164fcefcdc9222282f38cd0e083 100644
--- a/pkg/analysis_server/test/integration/execution/test_all.dart
+++ b/pkg/analysis_server/test/integration/execution/test_all.dart
@@ -7,11 +7,13 @@ import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'create_context_test.dart' as create_context_test;
 import 'delete_context_test.dart' as delete_context_test;
 import 'map_uri_test.dart' as map_uri_test;
+import 'set_subscription_test.dart' as set_subscription_test;
 
 main() {
   defineReflectiveSuite(() {
     create_context_test.main();
     delete_context_test.main();
     map_uri_test.main();
+    set_subscription_test.main();
   }, name: 'execution');
 }