@VisibleForTesting
    static BlobKey createKey(BlobType type) {
        if (type == PERMANENT_BLOB) {
            return new PermanentBlobKey();
        } else {
            return new TransientBlobKey();
        }
    }
@Test
    void testComparesDifferentBlobType() {
        final BlobKey k1 = BlobKey.createKey(TRANSIENT_BLOB, KEY_ARRAY_1, RANDOM_ARRAY_1);
        final BlobKey k2 = BlobKey.createKey(PERMANENT_BLOB, KEY_ARRAY_1, RANDOM_ARRAY_1);
        assertThat(k1).isGreaterThan(k2);
        assertThat(k2).isLessThan(k1);
    }