diff --git a/pkg/analyzer/test/src/dart/resolution/index_expression_test.dart b/pkg/analyzer/test/src/dart/resolution/index_expression_test.dart
index ba414c8f7a2..878105e470b 100644
--- a/pkg/analyzer/test/src/dart/resolution/index_expression_test.dart
+++ b/pkg/analyzer/test/src/dart/resolution/index_expression_test.dart
@@ -147,8 +147,10 @@ MethodInvocation
   }
 
   test_invalid_inDefaultValue_nullAware() async {
-    var result = await assertInvalidTestCode(r'''
+    var result = await resolveTestCodeWithDiagnostics(r'''
 void f({a = b?[0]}) {}
+//          ^
+// [diag.undefinedIdentifier] Undefined name 'b'.
 ''');
 
     // TODO(scheglov): https://github.com/dart-lang/sdk/issues/49101
@@ -172,8 +174,12 @@ IndexExpression
   }
 
   test_invalid_inDefaultValue_nullAware2() async {
-    var result = await assertInvalidTestCode(r'''
+    var result = await resolveTestCodeWithDiagnostics(r'''
 typedef void F({a = b?[0]});
+//                ^
+// [diag.defaultValueInFunctionType] Parameters in a function type can't have default values.
+//                  ^
+// [diag.undefinedIdentifier] Undefined name 'b'.
 ''');
 
     var node = result.findNode.index('[0]');
diff --git a/pkg/analyzer/test/src/dart/resolution/method_invocation_test.dart b/pkg/analyzer/test/src/dart/resolution/method_invocation_test.dart
index 970fc4ce5df..3b9e0d8c39d 100644
--- a/pkg/analyzer/test/src/dart/resolution/method_invocation_test.dart
+++ b/pkg/analyzer/test/src/dart/resolution/method_invocation_test.dart
@@ -5727,8 +5727,10 @@ MethodInvocation
   }
 
   test_invalid_inDefaultValue_nullAware() async {
-    var result = await assertInvalidTestCode('''
+    var result = await resolveTestCodeWithDiagnostics('''
 void f({a = b?.foo()}) {}
+//          ^
+// [diag.undefinedIdentifier] Undefined name 'b'.
 ''');
 
     var node = result.findNode.methodInvocation('?.foo()');
@@ -5752,8 +5754,12 @@ MethodInvocation
   }
 
   test_invalid_inDefaultValue_nullAware2() async {
-    var result = await assertInvalidTestCode('''
+    var result = await resolveTestCodeWithDiagnostics('''
 typedef void F({a = b?.foo()});
+//                ^
+// [diag.defaultValueInFunctionType] Parameters in a function type can't have default values.
+//                  ^
+// [diag.undefinedIdentifier] Undefined name 'b'.
 ''');
 
     var node = result.findNode.methodInvocation('?.foo()');
diff --git a/pkg/analyzer/test/src/dart/resolution/property_access_test.dart b/pkg/analyzer/test/src/dart/resolution/property_access_test.dart
index e9f2a3d26b0..669919df83c 100644
--- a/pkg/analyzer/test/src/dart/resolution/property_access_test.dart
+++ b/pkg/analyzer/test/src/dart/resolution/property_access_test.dart
@@ -656,8 +656,10 @@ AssignmentExpression
   }
 
   test_invalid_inDefaultValue_nullAware() async {
-    var result = await assertInvalidTestCode('''
+    var result = await resolveTestCodeWithDiagnostics('''
 void f({a = b?.foo}) {}
+//          ^
+// [diag.undefinedIdentifier] Undefined name 'b'.
 ''');
 
     var node = result.findNode.singlePropertyAccess;
@@ -677,8 +679,12 @@ PropertyAccess
   }
 
   test_invalid_inDefaultValue_nullAware2() async {
-    var result = await assertInvalidTestCode('''
+    var result = await resolveTestCodeWithDiagnostics('''
 typedef void F({a = b?.foo});
+//                ^
+// [diag.defaultValueInFunctionType] Parameters in a function type can't have default values.
+//                  ^
+// [diag.undefinedIdentifier] Undefined name 'b'.
 ''');
 
     var node = result.findNode.singlePropertyAccess;
@@ -698,8 +704,10 @@ PropertyAccess
   }
 
   test_invalid_inDefaultValue_nullAware_cascade() async {
-    var result = await assertInvalidTestCode('''
+    var result = await resolveTestCodeWithDiagnostics('''
 void f({a = b?..foo}) {}
+//          ^
+// [diag.undefinedIdentifier] Undefined name 'b'.
 ''');
 
     var node = result.findNode.singleFormalParameter;
diff --git a/pkg/analyzer/test/src/dart/resolution/resolution.dart b/pkg/analyzer/test/src/dart/resolution/resolution.dart
index bc866b8bfd1..bcab47fa3ef 100644
--- a/pkg/analyzer/test/src/dart/resolution/resolution.dart
+++ b/pkg/analyzer/test/src/dart/resolution/resolution.dart
@@ -133,14 +133,6 @@ mixin ResolutionTest implements ResourceProviderMixin {
     expect(result.diagnostics, isNotEmpty);
   }
 
-  /// Resolve the [code], and ensure that it can be resolved without a crash,
-  /// and is invalid, i.e. produces a diagnostic.
-  Future<TestResolvedUnitResult> assertInvalidTestCode(String code) async {
-    var result = await resolveTestCode(code);
-    expect(result.diagnostics, isNotEmpty);
-    return result;
-  }
-
   void assertParsedNodeText(AstNode node, String expected) {
     var buffer = StringBuffer();
     var sink = TreeStringSink(sink: buffer, indent: '');