| // Copyright (c) 2011, 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. |
| // Dart test program for the "is" type test operator. |
| |
| // @dart = 2.9 |
| |
| import "package:expect/expect.dart"; |
| |
| testTryCatch(x) { |
| try { |
| throw x; |
| Expect.fail("Exception '$x' should've been thrown"); |
| } on Object catch (obj) { |
| Expect.equals(obj, x); |
| } |
| } |
| |
| main() { |
| var evalCount = 0; |
| testEval(x) { |
| evalCount++; |
| return x; |
| } |
| |
| // Test that types that match JS primitive types compare correctly to Object |
| var x = 1; |
| Expect.isTrue(x is Object); |
| var x2 = 'hi'; |
| Expect.isTrue(x2 is Object); |
| var x3 = true; |
| Expect.isTrue(x3 is Object); |
| var x4 = null; |
| Expect.isTrue(x4 is Object); |
| var y; |
| Expect.isTrue(y is Object); |
| |
| // Verify that operand is evaluated |
| Expect.isTrue(testEval(123) is Object); |
| Expect.equals(1, evalCount); |
| Expect.isTrue(testEval('world') is Object); |
| Expect.equals(2, evalCount); |
| Expect.isTrue(testEval(false) is Object); |
| Expect.equals(3, evalCount); |
| Expect.isTrue(testEval(null) is Object); |
| Expect.equals(4, evalCount); |
| |
| // Verify that these objects are catchable |
| testTryCatch(444); |
| testTryCatch('abc'); |
| testTryCatch(true); |
| } |