Move prefer_typing_uninitialized_variables tests (#4551)

test/rules/all.dart

@@ -114,6 +114,8 @@ import 'prefer_mixin_test.dart' as prefer_mixin;
 import 'prefer_relative_imports_test.dart' as prefer_relative_imports;
 import 'prefer_single_quotes_test.dart' as prefer_single_quotes;
 import 'prefer_spread_collections_test.dart' as prefer_spread_collections;
+import 'prefer_typing_uninitialized_variables_test.dart'
+    as prefer_typing_uninitialized_variables;
 import 'prefer_void_to_null_test.dart' as prefer_void_to_null;
 import 'provide_deprecation_message_test.dart' as provide_deprecation_message;
 import 'public_member_api_docs_test.dart' as public_member_api_docs;
@@ -267,6 +269,7 @@ void main() {
   prefer_relative_imports.main();
   prefer_single_quotes.main();
   prefer_spread_collections.main();
+  prefer_typing_uninitialized_variables.main();
   prefer_void_to_null.main();
   provide_deprecation_message.main();
   public_member_api_docs.main();

test/rules/prefer_typing_uninitialized_variables_test.dart

@@ -0,0 +1,121 @@
+// Copyright (c) 2023, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+import '../rule_test_support.dart';
+
+main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(PreferTypingUninitializedVariablesTest);
+  });
+}
+
+@reflectiveTest
+class PreferTypingUninitializedVariablesTest extends LintRuleTest {
+  @override
+  String get lintRule => 'prefer_typing_uninitialized_variables';
+
+  test_field_final_noInitializer() async {
+    await assertDiagnostics(r'''
+class C {
+  final x;
+  C(this.x);
+}
+''', [
+      lint(18, 1),
+    ]);
+  }
+
+  test_field_typed() async {
+    await assertNoDiagnostics(r'''
+class C {
+  String? x;
+}
+''');
+  }
+
+  test_field_var_noInitializer() async {
+    await assertDiagnostics(r'''
+class C {
+  var x;
+}
+''', [
+      lint(16, 1),
+    ]);
+  }
+
+  test_field_var_noInitializer_notFirst() async {
+    await assertDiagnostics(r'''
+class C {
+  var a = 5,
+      b;
+}
+''', [
+      lint(29, 1),
+    ]);
+  }
+
+  test_field_var_noInitializer_static() async {
+    await assertDiagnostics(r'''
+class C {
+  static var x;
+}
+''', [
+      lint(23, 1),
+    ]);
+  }
+
+  test_forEachLoopVariable_final() async {
+    await assertNoDiagnostics(r'''
+void f() {
+  for (final e in <String>[]) {}
+}
+''');
+  }
+
+  test_forLoopVariable_var_noInitializer() async {
+    await assertDiagnostics(r'''
+void f() {
+  for (var i, j = 0; j < 5; i = j, j++) {}
+}
+''', [
+      lint(22, 1),
+    ]);
+  }
+
+  test_localVariable_var_initializer() async {
+    await assertNoDiagnostics(r'''
+void f() {
+  // ignore: unused_local_variable
+  var x = 1;
+}
+''');
+  }
+
+  test_localVariable_var_noInitializer() async {
+    await assertDiagnostics(r'''
+void f() {
+  // ignore: unused_local_variable
+  var x;
+}
+''', [
+      lint(52, 1),
+    ]);
+  }
+
+  test_topLevelVariable_var_initializer() async {
+    await assertNoDiagnostics(r'''
+var x = 4;
+''');
+  }
+
+  test_topLevelVariable_var_noInitializer() async {
+    await assertDiagnostics(r'''
+var x;
+''', [
+      lint(4, 1),
+    ]);
+  }
+}