Robert Nystrom
ba40d9bece
Change-Id: I73edeeaf4934899b71d6335dcb4b4b54dce46bae Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/426340 Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Nate Biggs <natebiggs@google.com> Commit-Queue: Nate Biggs <natebiggs@google.com>
103 lines
2.4 KiB
Dart
103 lines
2.4 KiB
Dart
// Copyright (c) 2024, 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:expect/expect.dart';
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// Check closure (tear-off, instantiation, static) equality, hash code, and
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// identities.
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//
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// In principle principle unequal objects can have the same hash code, but it's
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// very unlikely in this test. So we also check that if two closures are not
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// equal then they should have different hash codes.
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void staticFunction() {}
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void genericStaticFunction<T>(T t) {}
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class C {
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void memberFunction() {}
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void genericMemberFunction<T>(T t) {}
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}
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void main() {
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var functionExpression = () {};
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var genericFunctionExpression = <T>(T t) {};
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check(functionExpression, functionExpression, equal: true, isIdentical: true);
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check(
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genericFunctionExpression,
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genericFunctionExpression,
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equal: true,
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isIdentical: true,
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);
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check(
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genericFunctionExpression<int>,
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genericFunctionExpression<int>,
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equal: true,
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isIdentical: false,
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);
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check(() {}, () {}, equal: false, isIdentical: false);
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check(staticFunction, staticFunction, equal: true, isIdentical: true);
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check(
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genericStaticFunction,
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genericStaticFunction,
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equal: true,
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isIdentical: true,
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);
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check(
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genericStaticFunction<int>,
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genericStaticFunction<int>,
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equal: true,
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isIdentical: true,
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);
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final o1 = C();
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check(o1.memberFunction, o1.memberFunction, equal: true, isIdentical: false);
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check(
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o1.genericMemberFunction,
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o1.genericMemberFunction,
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equal: true,
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isIdentical: false,
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);
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check(
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o1.genericMemberFunction<int>,
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o1.genericMemberFunction<int>,
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equal: true,
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isIdentical: false,
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);
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final o2 = C();
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check(o1.memberFunction, o2.memberFunction, equal: false, isIdentical: false);
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check(
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o1.genericMemberFunction,
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o2.genericMemberFunction,
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equal: false,
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isIdentical: false,
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);
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check(
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o1.genericMemberFunction<int>,
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o2.genericMemberFunction<int>,
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equal: false,
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isIdentical: false,
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);
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}
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void check(
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Object? o1,
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Object? o2, {
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required bool equal,
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required bool isIdentical,
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}) {
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(equal ? Expect.equals : Expect.notEquals)(o1, o2);
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(equal ? Expect.equals : Expect.notEquals)(o1.hashCode, o2.hashCode);
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(isIdentical ? Expect.isTrue : Expect.isFalse)(identical(o1, o2));
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}
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