Brian Wilkerson
0190d20bd6
Change-Id: I0a37352c903bf7139af25aab255fe6a5331ce98b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/194020 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
39 lines
1.1 KiB
Dart
39 lines
1.1 KiB
Dart
// Copyright (c) 2020, 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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import 'package:matcher/matcher.dart';
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typedef _Predicate<T> = bool Function(T value);
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/// Lightweight expect that can be run outside of a test context.
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class ExpectMixin {
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void expect(actual, matcher, {String? reason}) {
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matcher = _wrapMatcher(matcher);
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var matchState = {};
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try {
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if ((matcher as Matcher).matches(actual, matchState)) {
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return;
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}
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} catch (e, trace) {
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reason ??= '$e at $trace';
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}
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throw Exception(reason);
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}
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static Matcher _wrapMatcher(x) {
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if (x is Matcher) {
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return x;
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} else if (x is _Predicate<Object>) {
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// x is already a predicate that can handle anything
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return predicate(x);
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} else if (x is _Predicate<Null>) {
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// x is a unary predicate, but expects a specific type
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// so wrap it.
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return predicate((a) => (x as dynamic)(a));
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} else {
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return equals(x);
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}
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}
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}
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