Created
March 7, 2018 07:13
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Object.ReferenceEqualsの動きを確認する
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using System; | |
using Xunit; | |
namespace Test { | |
public class ObjectTest { | |
[Fact] | |
public void ReferenceEquals_同じインスタンスならtrue() { | |
// 同じインスタンスの比較はtrue | |
var left = new object(); | |
var right = left; | |
Assert.True(Object.ReferenceEquals(left, right)); | |
} | |
[Fact] | |
public void ReferenceEquals_nullとnullならtrue() { | |
// nullとnullの比較はtrue | |
Assert.True(Object.ReferenceEquals(null, null)); | |
} | |
[Fact] | |
public void ReferenceEquals_あるオブジェクトとnullはfalse() { | |
// nullとの比較はfalse | |
Assert.False(Object.ReferenceEquals(new object(), null)); | |
Assert.False(Object.ReferenceEquals(null, new object())); | |
} | |
[Fact] | |
public void ReferenceEquals_値型の比較は常にfalse() { | |
// ボックス化されるから、値型の比較は常にfalse | |
Assert.False(Object.ReferenceEquals(1L, 1L)); | |
} | |
} | |
} |
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