John Messerly
55 lines
1.6 KiB
Dart
55 lines
1.6 KiB
Dart
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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library checked_mode_helper;
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import 'package:expect/expect.dart';
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/// Returns `true` if the program is running in checked mode.
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bool inCheckedMode() {
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try {
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var i = 42;
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String s = i;
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} on TypeError catch (e) {
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return true;
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}
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return false;
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}
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/// Checks that a dynamic type error is thrown if and only if [f] is executed in
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/// checked mode and [expectTypeError] is `true`.
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void testDynamicTypeError(bool expectTypeError, f(), [String message]) {
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if (expectTypeError) {
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checkDynamicTypeError(f, message);
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} else {
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checkNoDynamicTypeError(f, message);
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}
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}
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/// Checks that a dynamic type error is thrown if and only if [f] is executed in
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/// checked mode.
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void checkDynamicTypeError(f(), [String message]) {
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message = message != null ? ': $message' : '';
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try {
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f();
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Expect.isFalse(inCheckedMode(),
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'Missing type error in checked mode$message.');
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} on TypeError catch (e) {
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Expect.isTrue(inCheckedMode(),
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'Unexpected type error in production mode.');
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}
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}
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/// Checks that no dynamic type error is thrown when [f] is executed regardless
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/// of execution mode.
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void checkNoDynamicTypeError(f(), [String message]) {
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message = message != null ? ': $message' : '';
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try {
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f();
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} on TypeError catch (e) {
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String mode = inCheckedMode() ? 'checked mode' : 'production mode';
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Expect.fail('Unexpected type error in $mode$message.');
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}
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}
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