tests/language/nnbd/is_type_test/null_is_test.dart

// Copyright (c) 2020, 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:expect/expect.dart';

// Type tests (is checks) located in a null safe library.
main() {
  Expect.isFalse(null is Never);
  Expect.isTrue(null is Never?);
  Expect.isTrue(null is Null);
  Expect.isFalse(null is Object);
  Expect.isTrue(null is Object?);
  Expect.isTrue(null is dynamic);

  // Testing all built in types because of a regression that caused them to be
  // handled differently https://github.com/dart-lang/sdk/issues/42851.
  Expect.isFalse(null is bool);
  Expect.isTrue(null is bool?);
  Expect.isFalse(null is num);
  Expect.isTrue(null is num?);
  Expect.isFalse(null is int);
  Expect.isTrue(null is int?);
  Expect.isFalse(null is double);
  Expect.isTrue(null is double?);
  Expect.isFalse(null is String);
  Expect.isTrue(null is String?);
  Expect.isFalse(null is List);
  Expect.isTrue(null is List?);
  Expect.isFalse(null is Set);
  Expect.isTrue(null is Set?);
  Expect.isFalse(null is Map);
  Expect.isTrue(null is Map?);
  Expect.isFalse(null is Symbol);
  Expect.isTrue(null is Symbol?);
}