为方法编写 Junits 测试 [关闭]

Question

我是 Java 新手。我想为这个方法写junit，要测试哪些部分才能获得全覆盖？

public class S3Client {

    private final AmazonS3 s3Client;

    @Inject @Named(S3_KIOSK_EVENT_BUCKET)
    private final String bucketName;
    public boolean save(String folderName, String filename, String messageBody) {

        try {
            s3Client.putObject(bucketName, String.format("%s/%s.json",folderName,filename), messageBody);
            log.debug("Message Published in S3 Bucket");
            return true;

        } catch (AmazonServiceException e) {
            log.error("File cannot be added. Error: "+ e);
        }
        return false;
    }
}

Answer 1

这取决于测试的类型，如果它是单一的，您可以模拟亚马逊客户端并在 put 对象方法调用或您想要的任何否定响应之后模拟积极响应，如果它是集成它应该有一个测试接收与 save 方法相同的参数并改变组合以成功和失败的方法，请记住，覆盖率基于测试通过的代码扇区，包括 try catch

S3Client subject;

AmazonS3 s3Client;

@BeforeAll
static void setup(){
    s3Client = mockito.mock(AmazonS3.class);
    subject = new S3Client(s3Client);
}

@Test
public void saveObjectInS3Test(){

    //We simulate that everithing is ok 
    when(s3Client.putObject(mockito.isAny(),mockito.isAny(),mockito.isAny())).thenReturns(new PutObjectResult())
    assertEqual(subject.save("fooForlderName","fooFileName","fooMessageBody"),true);

    //Then we can simulate an exception
    when(s3Client.putObject(mockito.isAny(),mockito.isAny(),mockito.isAny())).thenThrow(AmazonServiceException.class);
    assertEqual(subject.save("fooForlderName","fooFileName","fooMessageBody"),false);

}