chore: add test for lower-case header (e.g. cseq)

Author: Steven Vancoillie

lib/utils/protocols/fixtures.ts

@@ -108,3 +108,11 @@ Date: Tue, 23 Jun 2015 08:38:03 GMT
 `
   .split('\n')
   .join('\r\n')
+
+// Example response from issue #310, with lower-case "cseq"
+export const optionsResponseLowerCase = `RTSP/1.0 200 OK
+Server: H264DVR 1.0
+cseq: 1
+Public: OPTIONS, DESCRIBE, SETUP, TEARDOWN, GET_PARAMETER, PLAY, PAUSE
+
+`

lib/utils/protocols/rtsp.test.ts

@@ -12,6 +12,7 @@ import {
   sdpResponse,
   sdpResponseLive555,
   setupResponse,
+  optionsResponseLowerCase,
   teardownResponse,
   setupResponseNoTimeout,
 } from './fixtures'
@@ -21,6 +22,7 @@ describe('Rtsp', () => {
     it('should return an int', () => {
       expect(sequence(Buffer.from(sdpResponse))).toEqual(3)
       expect(sequence(Buffer.from(setupResponse))).toEqual(5)
+      expect(sequence(Buffer.from(optionsResponseLowerCase))).toEqual(1)
     })
   })
   describe('sessionId', () => {