### Question:
AliOSSBlobStore extends BaseBlobStore { @Override public boolean blobExists(String container, String name) { return doOssOperation(oss -> oss.doesObjectExist(container, name)); } @Inject protected  AliOSSBlobStore(AliOSSApi aliOSSApi, BlobStoreContext context, BlobUtils blobUtils, Supplier<Location> defaultLocation,
                              LocationsSupplier locations, PayloadSlicer slicer); @Override boolean containerExists(String container); @Override PageSet<? extends StorageMetadata> list(String container, ListContainerOptions options); @Override boolean blobExists(String container, String name); @Override String putBlob(String container, Blob blob); @Override String putBlob(String container, Blob blob, PutOptions options); @Override Blob getBlob(String container, String name, GetOptions options); @Override void removeBlob(String container, String name); @Override PageSet<? extends StorageMetadata> list(); @Override boolean createContainerInLocation(Location location, String container); @Override boolean createContainerInLocation(Location location, String container, CreateContainerOptions options); @Override ContainerAccess getContainerAccess(String container); @Override void setContainerAccess(String container, ContainerAccess access); @Override BlobMetadata blobMetadata(String container, String name); @Override BlobAccess getBlobAccess(String container, String name); @Override void setBlobAccess(String container, String name, BlobAccess access); @Override MultipartUpload initiateMultipartUpload(String container, BlobMetadata blob, PutOptions options); @Override void abortMultipartUpload(MultipartUpload mpu); @Override String completeMultipartUpload(MultipartUpload mpu, List<MultipartPart> parts); @Override MultipartPart uploadMultipartPart(MultipartUpload mpu, int partNumber, Payload payload); @Override List<MultipartPart> listMultipartUpload(MultipartUpload mpu); @Override List<MultipartUpload> listMultipartUploads(String container); @Override long getMinimumMultipartPartSize(); @Override long getMaximumMultipartPartSize(); @Override int getMaximumNumberOfParts();  }### Answer:
@Test void testBlobExists() { Mockito.when(ossClient.doesObjectExist(CONTAINER, FILENAME)) .thenReturn(true) .thenReturn(false); assertTrue(aliOSSBlobStore.blobExists(CONTAINER, FILENAME)); assertFalse(aliOSSBlobStore.blobExists(CONTAINER, FILENAME)); }