fix code completion invocation on getter

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

Index: pkg/analysis_server/test/services/completion/completion_test_util.dart
diff --git a/pkg/analysis_server/test/services/completion/completion_test_util.dart b/pkg/analysis_server/test/services/completion/completion_test_util.dart
index 573f604d02b431c6b3f7f025e4f1dc991e0f565b..0b242bd91929a49546c509a9982d3f6b6d584a9f 100644
--- a/pkg/analysis_server/test/services/completion/completion_test_util.dart
+++ b/pkg/analysis_server/test/services/completion/completion_test_util.dart
@@ -2697,6 +2697,15 @@ abstract class AbstractSelectorSuggestionTest extends AbstractCompletionTest {
     });
   }
 
+  test_PrefixedIdentifier_getter() {
+    // SimpleIdentifier  PrefixedIdentifier  ExpressionStatement
+    addTestSource('String get g => "one"; f() {g.^}');
+    computeFast();
+    return computeFull((bool result) {
+      assertSuggestInvocationGetter('length', 'int');
+    });
+  }
+
   test_PrefixedIdentifier_library() {
     // SimpleIdentifier  PrefixedIdentifier  ExpressionStatement
     addSource('/testB.dart', '''