java JUnit 5和模拟assertThrows()引发NullPointerException而不是原始异常

zyfwsgd6 于 2023-02-20 发布在 Java

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我想测试一个抛出MyCustomException类型异常的方法，这是我的类MyService的一个例子。

public class MyService {
    public void invoke(InvocationContext ctx) throws MyCustomException{
        if(ctx == null) {
            throw new MyCustomException("Parameter ctx must not be null.");
        }
    }
}

我想测试，如果我用assertThrows()传递一个空值，方法是否抛出MyCustomException。

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mockito;
import org.mockito.Spy;
import org.mockito.junit.jupiter.MockitoExtension;

@ExtendWith(MockitoExtension.class)
public class AxwApplicationTest {
    @Spy
    @InjectMocks
    MyService myServiceToTest;

    @Test
    public void invoke_ShouldThrow_MyCustomException() {
        assertThrows(MyCustomException.class, () -> {
            myServiceToTest.invoke(null);
        });
    }
}

这个异常被抛出了，但最终是NullPointerException，我不知道如何解决它。assertThrows给出了以下错误：

java.lang.AssertionError: unexpected exception type thrown; expected:<com.myproject.MyCustomException> but was:<java.lang.NullPointerException>

Maven依赖项：

<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter-api</artifactId>
    <version>5.9.2</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-core</artifactId>
    <version>4.0.0</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-junit-jupiter</artifactId>
    <version>4.0.0</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-inline</artifactId>
    <version>4.0.0</version>
    <scope>test</scope>
</dependency>

Java

来源：https://stackoverflow.com/questions/75508103/junit-5-and-mockito-assertthrows-raises-nullpointerexception-instead-of-origin

1条答案

按热度按时间

nimxete21#

问题出在@InjectMocks和@Spy注解上。2同时使用它们没有意义（如stackoverflow帖子中所讨论的）。3手工创建类解决了NullPointerException问题，测试运行成功

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mockito;
import org.mockito.Spy;
import org.mockito.junit.jupiter.MockitoExtension;

import static 
org.junit.jupiter.api.Assertions.assertThrows;

@ExtendWith(MockitoExtension.class)
public class MyServiceTest {
   MyService myServiceToTest;

   @Test
   public void invoke_ShouldThrow_MyCustomException() {
      MyService myServiceToTest = new MyService();
      assertThrows(MyCustomException.class, () -> {
        myServiceToTest.invoke(null);
      });
   }
}

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java JUnit 5和模拟assertThrows()引发NullPointerException而不是原始异常

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