我可以帮您翻译为中文。以下是翻译内容:
我正在尝试模拟一个私有方法(executeGetRequest),在声明我要返回给私有方法的模拟的那一行中,实际上使用了空参数执行了私有方法,因此引发了NullPointerException。
VlcPlayerMinimal.java:
package com.nicobrest.kamehouse.vlcrc.model;
public class VlcPlayerMinimal {
public static void main(String[] args) {
String vlcRcStatus = new VlcPlayerMinimal().getVlcRcStatus();
System.out.println(vlcRcStatus);
}
public String getVlcRcStatus() {
Client client = new Client();
GetRequest getRequest = new GetRequest();
String vlcRcStatus = executeGetRequest(client, getRequest);
return vlcRcStatus;
}
private String executeGetRequest(Client client, GetRequest getRequest) {
return client.execute(getRequest);
}
private class Client {
public String execute(GetRequest getRequest) {
return "{status: playing, id: 1}";
}
}
private class GetRequest {
}
}
VlcPlayerMinimalTest.java:
package com.nicobrest.kamehouse.model;
import static org.junit.Assert.*;
import static org.mockito.ArgumentMatchers.any;
import com.nicobrest.kamehouse.vlcrc.model.VlcPlayerMinimal;
import org.junit.Test;
import org.powermock.api.mockito.PowerMockito;
public class VlcPlayerMinimalTest {
@Test
public void getVlcRcStatusTest() {
VlcPlayerMinimal vlcPlayerSpy = PowerMockito.spy(new VlcPlayerMinimal());
try {
PowerMockito.doReturn("{status: stopped, id: 2}").when(vlcPlayerSpy, "executeGetRequest", any(), any());
String vlcRcStatus = vlcPlayerSpy.getVlcRcStatus();
System.out.println(vlcRcStatus);
} catch (Exception e) {
e.printStackTrace();
fail("Unexpected exception thrown.");
}
}
}
堆栈跟踪:
java.lang.NullPointerException
at com.nicobrest.kamehouse.vlcrc.model.VlcPlayerMinimal.executeGetRequest(VlcPlayerMinimal.java:18)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.powermock.reflect.internal.WhiteboxImpl.performMethodInvocation(WhiteboxImpl.java:1846)
at org.powermock.reflect.internal.WhiteboxImpl.doInvokeMethod(WhiteboxImpl.java:810)
at org.powermock.reflect.internal.WhiteboxImpl.invokeMethod(WhiteboxImpl.java:675)
at org.powermock.reflect.Whitebox.invokeMethod(Whitebox.java:401)
at org.powermock.api.mockito.internal.expectation.PowerMockitoStubberImpl.when(PowerMockitoStubberImpl.java:95)
at com.nicobrest.kamehouse.model.VlcPlayerMinimalTest.getVlcRcStatusTest(VlcPlayerMinimalTest.java:17)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
...
看起来PowerMockito实际上是在调用我试图模拟的方法,即在这一行中:PowerMockito.doReturn("{status: stopped, id: 2}").when(vlcPlayerSpy, "executeGetRequest", any(), any());
由于客户端为null,它正在调用execute(getClient)方法,但那是我试图在测试中避免调用的方法。
有什么想法可以解决这个问题吗?我已经尝试了一段时间,但没有成功。
我使用的是Java 8、powermock 1.7.3和junit 4.12。
@PrepareForTest(xxx)
。 - user180100