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Side by Side Diff: tests/language/checked_mode_helper.dart

Issue 2999733002: Migrate test block 47 and downstream dependencies to Dart 2.0. (Closed)
Patch Set: Whitespace Created 3 years, 4 months ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file.
4
5 library checked_mode_helper;
6
7 import 'package:expect/expect.dart';
8
9 /// Returns `true` if the program is running in checked mode.
10 bool inCheckedMode() {
11 try {
12 var i = 42;
13 String s = i;
14 } on TypeError catch (e) {
15 return true;
16 }
17 return false;
18 }
19
20 /// Checks that a dynamic type error is thrown if and only if [f] is executed in
21 /// checked mode and [expectTypeError] is `true`.
22 void testDynamicTypeError(bool expectTypeError, f(), [String message]) {
23 if (expectTypeError) {
24 checkDynamicTypeError(f, message);
25 } else {
26 checkNoDynamicTypeError(f, message);
27 }
28 }
29
30 /// Checks that a dynamic type error is thrown if and only if [f] is executed in
31 /// checked mode.
32 void checkDynamicTypeError(f(), [String message]) {
33 message = message != null ? ': $message' : '';
34 try {
35 f();
36 Expect.isFalse(
37 inCheckedMode(), 'Missing type error in checked mode$message.');
38 } on TypeError catch (e) {
39 Expect.isTrue(inCheckedMode(), 'Unexpected type error in production mode.');
40 }
41 }
42
43 /// Checks that no dynamic type error is thrown when [f] is executed regardless
44 /// of execution mode.
45 void checkNoDynamicTypeError(f(), [String message]) {
46 message = message != null ? ': $message' : '';
47 try {
48 f();
49 } on TypeError catch (e) {
50 String mode = inCheckedMode() ? 'checked mode' : 'production mode';
51 Expect.fail('Unexpected type error in $mode$message.');
52 }
53 }
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