chore: report known lint issues

Author: Desdaemon

test/src/analyzers/lint_analyzer/rules/rules_list/use_setstate_synchronously/examples/known_errors.dart

@@ -0,0 +1,8 @@
+class _MyState extends State {
+  void awaitEmptyFuture() async {
+    await Future<void>.value();
+    setState(() {}); // LINT
+  }
+}
+
+class State {}

test/src/analyzers/lint_analyzer/rules/rules_list/use_setstate_synchronously/use_setstate_synchronously_rule_test.dart

@@ -5,6 +5,7 @@ import 'package:test/test.dart';
 import '../../../../../helpers/rule_test_helper.dart';
 
 const _examplePath = 'use_setstate_synchronously/examples/example.dart';
+const _issuesPath = 'use_setstate_synchronously/examples/known_errors.dart';
 
 void main() {
   group('UseSetStateSynchronouslyTest', () {
@@ -51,5 +52,20 @@ void main() {
         ],
       );
     });
+
+    test('reports known issues', () async {
+      final unit = await RuleTestHelper.resolveFromFile(_issuesPath);
+      final issues = UseSetStateSynchronouslyRule().check(unit);
+
+      RuleTestHelper.verifyIssues(
+        issues: issues,
+        startLines: [4],
+        startColumns: [5],
+        locationTexts: ['setState'],
+        messages: [
+          "Avoid calling 'setState' past an await point without checking if the widget is mounted.",
+        ],
+      );
+    });
   });
 }