Set expiration on deleted doc doesn't throw exception

@Test

public void testSetExpirationOnDeletedDoc() throws CouchbaseLiteException {

    Date dto30 = new Date(System.currentTimeMillis() + 30000L);

    MutableDocument doc1a = new MutableDocument("deleted_doc");

    doc1a.setInt("answer", 12);

    doc1a.setValue("question", "What is six plus six?");

    saveDocInBaseTestDb(doc1a);

    baseTestDb.delete(doc1a);

    try {

        baseTestDb.setDocumentExpiration("deleted_doc", dto30);

        fail("Expect CouchbaseLiteException");

    }

    catch (CouchbaseLiteException e) { assertEquals(e.getCode(), CBLError.Code.NOT_FOUND); }

}