linter: Move tests for 3 lint rules:

* no_default_cases tests
* overridden_fields
* unnecessary_lambdas

Change-Id: Ib84fca717b6ef8badae2ebe41bc42dfa34fb8407
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/392160
Reviewed-by: Phil Quitslund <[email protected]>
Commit-Queue: Phil Quitslund <[email protected]>
Auto-Submit: Samuel Rawlins <[email protected]>

pkg/linter/test/rules/all.dart

@@ -143,6 +143,7 @@ import 'missing_code_block_language_in_doc_comment_test.dart'
 import 'missing_whitespace_between_adjacent_strings_test.dart'
     as missing_whitespace_between_adjacent_strings;
 import 'no_adjacent_strings_in_list_test.dart' as no_adjacent_strings_in_list;
+import 'no_default_cases_test.dart' as no_default_cases;
 import 'no_duplicate_case_values_test.dart' as no_duplicate_case_values;
 import 'no_leading_underscores_for_library_prefixes_test.dart'
     as no_leading_underscores_for_library_prefixes;
@@ -419,6 +420,7 @@ void main() {
   missing_code_block_language_in_doc_comment.main();
   missing_whitespace_between_adjacent_strings.main();
   no_adjacent_strings_in_list.main();
+  no_default_cases.main();
   no_duplicate_case_values.main();
   no_leading_underscores_for_library_prefixes.main();
   no_leading_underscores_for_local_identifiers.main();

pkg/linter/test/rules/no_default_cases_test.dart

@@ -0,0 +1,78 @@
+// Copyright (c) 2024, 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(NoDefaultCasesTest);
+  });
+}
+
+@reflectiveTest
+class NoDefaultCasesTest extends LintRuleTest {
+  @override
+  String get lintRule => 'no_default_cases';
+
+  test_enumLikeType() async {
+    await assertDiagnostics(r'''
+class C {
+  final int i;
+  const C._(this.i);
+
+  static const a = C._(1);
+  static const b = C._(2);
+  static const c = C._(3);
+}
+
+void f(C c) {
+  switch (c) {
+    case C.a :
+      print('a');
+      break;
+    default:
+      print('default');
+  }
+}
+''', [
+      lint(210, 32),
+    ]);
+  }
+
+  test_enumType() async {
+    await assertDiagnostics(r'''
+void f(E e) {
+  switch(e) {
+    case E.a :
+      print('a');
+      break;
+    default:
+      print('default');
+  }
+}
+
+enum E {
+  a, b, c;
+}
+''', [
+      lint(78, 32),
+    ]);
+  }
+
+  test_intType() async {
+    await assertNoDiagnostics(r'''
+void f(int i) {
+  switch (i) {
+    case 1 :
+      print('1');
+      break;
+    default:
+      print('default');
+  }
+}
+''');
+  }
+}

pkg/linter/test/rules/overridden_fields_test.dart

@@ -97,6 +97,57 @@ class B extends A {
 ''');
   }
 
+  test_extendingClass_multipleDeclarations() async {
+    await assertDiagnostics(r'''
+class A {
+  int y = 1;
+}
+class B extends A {
+  final x = 1, y = 2;
+}
+''', [
+      lint(60, 1),
+    ]);
+  }
+
+  test_extendingClass_overridingAbstract() async {
+    await assertNoDiagnostics(r'''
+abstract class A {
+  abstract int x;
+}
+class B extends A {
+  @override
+  int x = 1;
+}
+''');
+  }
+
+  test_extendingClass_staticField() async {
+    await assertNoDiagnostics(r'''
+class A {
+  static int x = 1;
+}
+class B extends A {
+  static int x = 2;
+}
+''');
+  }
+
+  test_extendsClass_indirectly() async {
+    await assertDiagnostics(r'''
+class A {
+  int x = 0;
+}
+class B extends A {}
+class C extends B {
+  @override
+  int x = 1;
+}
+''', [
+      lint(84, 1),
+    ]);
+  }
+
   test_externalLibrary() async {
     newFile('$testPackageLibPath/a.dart', r'''
 class A {
@@ -141,6 +192,44 @@ class B extends A {
 ''');
   }
 
+  test_implementingClass() async {
+    await assertNoDiagnostics(r'''
+class A {
+  int x = 1;
+}
+class B implements A {
+  @override
+  int x = 2;
+}
+''');
+  }
+
+  test_mixingInMixin() async {
+    await assertDiagnostics(r'''
+mixin M {
+  int x = 1;
+}
+class A with M {
+  @override
+  int x = 2;
+}
+''', [
+      lint(60, 1),
+    ]);
+  }
+
+  test_mixingInMixin_overridingAbstract() async {
+    await assertNoDiagnostics(r'''
+mixin M {
+  abstract int x;
+}
+class A with M {
+  @override
+  int x = 2;
+}
+''');
+  }
+
   test_mixinInheritsFromNotObject() async {
     // See: https://github.com/dart-lang/linter/issues/2969
     // Preserves existing testing logic but has so many misuses of mixins that
@@ -230,6 +319,20 @@ class GC34 extends GC33 {
     ]);
   }
 
+  test_mixinSuperclassConstraint() async {
+    await assertDiagnostics(r'''
+class A {
+  int x = 1;
+}
+mixin M on A {
+  @override
+  final x = 1;
+}
+''', [
+      lint(60, 1),
+    ]);
+  }
+
   test_overridingAbstractField() async {
     await assertNoDiagnostics(r'''
 abstract class A {

pkg/linter/test/rules/unnecessary_lambdas_test.dart

@@ -128,6 +128,15 @@ var x = [].map((x) => C(3));
 ''');
   }
 
+  test_deeplyNestedVariable() async {
+    await assertNoDiagnostics(r'''
+void f() {
+  var x = (a, b) => foo(foo(b)).foo(a, b);
+}
+dynamic foo(a) => 7;
+''');
+  }
+
   test_emptyLambda() async {
     await assertNoDiagnostics(r'''
 var f = () {};
@@ -343,6 +352,24 @@ class C {
     };
   }
 }
+''');
+  }
+
+  test_targetIsFinalParameter() async {
+    await assertDiagnostics(r'''
+void f(List<String> list) {
+  list.where((final e) => ((a) => e.contains(a))(e));
+}
+''', [
+      lint(55, 20),
+    ]);
+  }
+
+  test_targetIsVarParameter() async {
+    await assertNoDiagnostics(r'''
+void main(List<String> list) {
+  list.where((e) => ((a) => e.contains(a))(e));
+}
 ''');
   }
 }