ASN1Sequence sequence = new DERSequence(vector);
        ASN1Integer result = ASN1Util.as(ASN1Integer.class, sequence, 0);
        assertSame(expected, result);
    }

    @Test
    void testAs_ASN1Sequence_Failure() {
        // Test failed casting from sequence
        ASN1EncodableVector vector = new ASN1EncodableVector();
        vector.add(new ASN1Integer(10));
        ASN1Sequence sequence = new DERSequence(vector);