@Test
void testSendChallengeInitiateNegotiate() {

    this.out = new byte[1];
    this.out[0] = -1;
    this.negAuthFilter.sendChallengeInitiateNegotiate(this.response);
    Assertions.assertEquals("Negotiate", this.response.headersAdded.get("WWW-Authenticate").get(0));
    Assertions.assertEquals("NTLM", this.response.headersAdded.get("WWW-Authenticate").get(1));
    Assertions.assertEquals("keep-alive", this.response.headers.get("Connection"));
    Assertions.assertEquals(HttpServletResponse.SC_UNAUTHORIZED, this.response.sc);
    Assertions.assertEquals(0, this.response.errorCode);
    Assertions.assertFalse(this.response.isFlushed);
}