diff --git a/pkg/analyzer/test/src/dart/resolution/resolution.dart b/pkg/analyzer/test/src/dart/resolution/resolution.dart
index bcab47fa3ef..e4fb53348d8 100644
--- a/pkg/analyzer/test/src/dart/resolution/resolution.dart
+++ b/pkg/analyzer/test/src/dart/resolution/resolution.dart
@@ -28,7 +28,6 @@ import 'package:analyzer_testing/src/expected_diagnostics.dart';
 import 'package:analyzer_utilities/testing/tree_string_sink.dart';
 import 'package:test/test.dart';
 
-import '../../../generated/test_support.dart';
 import '../../../util/diff.dart';
 import '../../../util/element_printer.dart';
 import '../../summary/resolved_ast_printer.dart';
@@ -119,16 +118,6 @@ mixin ResolutionTest implements ResourceProviderMixin {
     }
   }
 
-  void assertErrorsInList(
-    List<Diagnostic> diagnostics,
-    List<ExpectedDiagnostic> expectedDiagnostics,
-  ) {
-    GatheringDiagnosticListener diagnosticListener =
-        GatheringDiagnosticListener();
-    diagnosticListener.addAll(diagnostics);
-    diagnosticListener.assertErrors(expectedDiagnostics);
-  }
-
   void assertHasTestErrors(TestResolvedUnitResult result) {
     expect(result.diagnostics, isNotEmpty);
   }
diff --git a/pkg/analyzer/test/src/diagnostics/mock_sdk_test.dart b/pkg/analyzer/test/src/diagnostics/mock_sdk_test.dart
index 2411c616be1..74cf21f522f 100644
--- a/pkg/analyzer/test/src/diagnostics/mock_sdk_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/mock_sdk_test.dart
@@ -4,6 +4,7 @@
 
 import 'package:analyzer/dart/analysis/results.dart';
 import 'package:analyzer/error/error.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/context_collection_resolution.dart';
@@ -51,7 +52,7 @@ class MockSdkTest extends PubPackageResolutionTest {
               element.diagnosticCode.type != DiagnosticType.STATIC_WARNING,
         )
         .toList();
-    assertErrorsInList(notHints, []);
+    expect(notHints, isEmpty);
   }
 
   Future<ResolvedLibraryResult> _resolvedLibraryByUri(String uriStr) async {