unreachable_from_main: exempt setUpClass, tearDownClass

Closes #61528

GitOrigin-RevId: a273eb8
Change-Id: Icb0c309eb15f579b2d431911bd5273240ce00383
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/450182
Reviewed-by: Keerti Parthasarathy <[email protected]>
Commit-Queue: Keerti Parthasarathy <[email protected]>
Reviewed-by: Samuel Rawlins <[email protected]>

Author: RohitSaily

pkg/linter/lib/src/rules/unreachable_from_main.dart

@@ -129,7 +129,9 @@ class _DeclarationGatherer {
                 rawName.startsWith('test_') ||
                 rawName.startsWith('solo_test_') ||
                 rawName == 'setUp' ||
-                rawName == 'tearDown';
+                rawName == 'tearDown' ||
+                rawName == 'setUpClass' ||
+                rawName == 'tearDownClass';
             if (!isOverride(element) && !isTestMethod) {
               declarations.add(member);
             }

pkg/linter/test/rules/unreachable_from_main_test.dart

@@ -1151,6 +1151,29 @@ mixin M {}
     );
   }
 
+  test_setUpClass_class_static_member_reachable() async {
+    await assertNoDiagnostics('''
+void main() {
+  A();
+}
+
+final class A {
+  static setUpClass() {}
+}
+''');
+  }
+
+  test_setUpClass_top_level_unreachable() async {
+    await assertDiagnostics(
+      '''
+void main() {}
+
+setUpClass() {}
+''',
+      [lint(16, 10)],
+    );
+  }
+
   test_staticField_unreachable() async {
     await assertDiagnostics(
       r'''
@@ -1349,6 +1372,29 @@ class C {
     );
   }
 
+  test_tearDownClass_class_static_member_reachable() async {
+    await assertNoDiagnostics('''
+void main() {
+  A();
+}
+
+final class A {
+  static tearDownClass() {}
+}
+''');
+  }
+
+  test_tearDownClass_top_level_unreachable() async {
+    await assertDiagnostics(
+      '''
+void main() {}
+
+tearDownClass() {}
+''',
+      [lint(16, 13)],
+    );
+  }
+
   test_topLevelFunction_reachable() async {
     await assertNoDiagnostics(r'''
 void main() {