SpringBoot：java.lang.NullPointerException

代码：

package com.atguigu.gulimall.thirdparty;import com.aliyun.oss.OSSClient;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;@SpringBootTest
public class GulimallThirdPartyApplicationTests {@AutowiredOSSClient ossClient;@Testpublic void testUpload() throws FileNotFoundException {InputStream inputStream = new FileInputStream("C:\\Users\\Administrator\\Pictures\\removeAll.png");ossClient.putObject("gulimall-kaisarh", "removeAll.png", inputStream);ossClient.shutdown();System.out.println("上传完成");}@Testpublic void contextLoads() {}
}

错误
java.lang.NullPointerException

java.lang.NullPointerExceptionat com.atguigu.gulimall.thirdparty.GulimallThirdPartyApplicationTests.testUpload(GulimallThirdPartyApplicationTests.java:23)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)at org.junit.runners.ParentRunner.run(ParentRunner.java:363)at org.junit.runner.JUnitCore.run(JUnitCore.java:137)at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)

原因：
没有使用@RunWith(SpringRunner.class)注解

Springboot的@RunWith(SpringRunner.class)注解的意义在于：Test测试类要使用注入的类，比如@Autowired注入的类，

有了@RunWith(SpringRunner.class)这些类才能实例化到spring容器中，自动注入才能生效

不然直接一个NullPointerExecption

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