@VisibleForTesting
    static BlobKey createKey(BlobType type) {
        if (type == PERMANENT_BLOB) {
            return new PermanentBlobKey();
        } else {
            return new TransientBlobKey();
        }
    }
@Test
    void testToFromStringTransientKey() {
        testToFromString(BlobKey.createKey(TRANSIENT_BLOB));
    }