使用assertEquals和Comparison Failure窗口时，如何显示对象字段而不是引用

When I try to compare two similar lists of the same class of objects using JUnit's assertEquals method, I get the option in Intellij:

当我尝试使用JUnit的assertEquals方法比较同一类对象的两个相似列表时,我得到了Intellij中的选项:

<Click to see difference>

The Comparison Failure dialog opens and I see the expected references and actual references. I have properly overridden the equals method because when the two objects have the same fields, the test passes.

“比较失败”对话框打开,我看到了预期的引用和实际引用。我已正确覆盖equals方法,因为当两个对象具有相同的字段时,测试通过。

Instead of showing the references, is it possible to show the fields of the objects?

而不是显示引用,是否可以显示对象的字段?

This will greatly reduce the time it takes to debug a test case.

这将大大减少调试测试用例所需的时间。

1 个解决方案

#1

TL;DR

Implement toString() on Models.YTPoint and IntelliJ will be able to display a meaningful 'difference message'.

在Models.YTPoint和IntelliJ上实现toString()将能够显示有意义的“差异消息”。

Detail

IntelliJ's 'difference message' is derived from the type's toString(). If the type has no toString() then IntelliJ will use the object reference.

IntelliJ的“差异消息”派生自类型的toString()。如果类型没有toString(),那么IntelliJ将使用对象引用。

So, if you define a toString() on whatever object these lists contain then IntelliJ will be able to display a meaningful 'difference message'.

因此,如果在这些列表包含的任何对象上定义toString(),则IntelliJ将能够显示有意义的“差异消息”。

Here's an exmaple:

这是一个例子:

@Test
public void showDifferenceMessage() {
    List<Foo> one = Lists.newArrayList(new Foo(1, "me"));
    List<Foo> two = Lists.newArrayList(new Foo(1, "you"));

    Assert.assertEquals(one, two);
}

With no implementation of Foo.toString() when I run the test IntelliJ displays:

当我运行测试时,没有实现Foo.toString()IntelliJ显示:

java.lang.AssertionError: 
Expected :[org.glytching.sandbox.Foo@16f65612]
Actual   :[org.glytching.sandbox.Foo@311d617d]

And when I implement Foo.toString() and re run that test IntelliJ displays:

当我实现Foo.toString()并重新运行IntelliJ显示的测试时:

java.lang.AssertionError: 
Expected :[Foo{id=1, name='me'}]
Actual   :[Foo{id=1, name='you'}]

And if I Click to see difference IntelliJ displays:

如果我点击查看IntelliJ显示的差异:

#1