add completions in assert stmt - fixes #24888

pkg/analysis_server/test/services/completion/optype_test.dart

Index: pkg/analysis_server/test/services/completion/optype_test.dart
diff --git a/pkg/analysis_server/test/services/completion/optype_test.dart b/pkg/analysis_server/test/services/completion/optype_test.dart
index 94b5dafe2c1cc204d83cb2a7038d7ac0f2e8f566..28b844e79f8d1c506d153f8dfb70c0693345c9a6 100644
--- a/pkg/analysis_server/test/services/completion/optype_test.dart
+++ b/pkg/analysis_server/test/services/completion/optype_test.dart
@@ -98,6 +98,11 @@ class OpTypeTest {
     assertOpType(typeNames: true);
   }
 
+  test_Assert() {
+    addTestSource('main() {assert(^)}');
+    assertOpType(returnValue: true, typeNames: true);
+  }
+
   test_AssignmentExpression_name() {
     // SimpleIdentifier  VariableDeclaration  VariableDeclarationList
     // VariableDeclarationStatement  Block