使用isNull时的Java UnfinishedVerificationException

public class ExampleService {
    public void doSomething(String param) {
        if (param == null) {
            throw new IllegalArgumentException("Parameter cannot be null");
        }
        // 其他逻辑
    }
}

import static org.mockito.Mockito.*;
import org.junit.Test;

public class ExampleServiceTest {

    @Test(expected = IllegalArgumentException.class)
    public void testDoSomethingWithNullParam() {
        ExampleService service = mock(ExampleService.class);
        service.doSomething(null);
    }

    @Test
    public void testDoSomethingVerification() {
        ExampleService service = mock(ExampleService.class);
        service.doSomething("validParam");

        // 这里会抛出 UnfinishedVerificationException
        verify(service).doSomething(isNull());
    }
}

@Test
public void testDoSomethingVerification() {
    ExampleService service = mock(ExampleService.class);
    service.doSomething("validParam");

    // 正确的验证应该是检查方法是否被调用，而不是参数是否为 null
    verify(service).doSomething(anyString());
}

@Test
public void testDoSomethingVerification() {
    ExampleService service = mock(ExampleService.class);
    service.doSomething("validParam");

    verify(service).doSomething(anyString());
}