断言对象是特定类型 [英] Assert an object is a specific type

问题描述

在JUnit中是否可以断言一个对象是一个类的实例？由于各种原因，我在测试中有一个对象，我想检查其类型。它是Object1的类型还是Object2的类型？

Is it possible in JUnit to assert an object is an instance of a class? For various reasons I have an object in my test that I want to check the type of. Is it a type of Object1 or a type of Object2?

目前我有：

assertTrue(myObject instanceof Object1);
assertTrue(myObject instanceof Object2);

这有效，但我想知道是否有更具表现力的方式。

This works but I was wondering if there is a more expressive way of doing this.

例如：

assertObjectIsClass(myObject, Object1);

我可以这样做：

assertEquals(myObject.class, Object1.getClass());

是否有特定的断言方法允许我以更优雅的方式测试对象的类型，流畅的方式？

Is there a specific assert method that allows me to test a type of an object in a more elegant, fluid manner?

推荐答案

你可以使用 assertThat 方法和Matchers JUnit附带。

You can use the assertThat method and the Matchers that comes with JUnit.

看看此链接描述了一些关于JUnit Matchers的内容。

Take a look at this link that describes a little bit about the JUnit Matchers.

示例：

public class BaseClass {
}

public class SubClass extends BaseClass {
}

测试：

import org.junit.Test;

import static org.hamcrest.CoreMatchers.instanceOf;
import static org.junit.Assert.assertThat;

/**
 * @author maba, 2012-09-13
 */
public class InstanceOfTest {

    @Test
    public void testInstanceOf() {
        SubClass subClass = new SubClass();
        assertThat(subClass, instanceOf(BaseClass.class));
    }
}

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