iSCSICmdSnTooHigh test case does not set CMDSN to MAXCMDSN+1 on OSX system

[carmark]

On OSX system, I used libiscsi to test a target, and it looks like a bug in iSCSICmdSnTooHigh test case.

For the first test case, it will set the CMDSN to MAXCMDSN+1 to test whether the target will ignore this invalid PDU. The test result is follow, and I used wireshark to capture the packets attached. It only found on OSX system and works well on Linux system.

Suite: iSCSIcmdsn
  Test: iSCSICmdSnTooHigh ...
    Test sending invalid iSCSI CMDSN
    CMDSN MUST be in the range EXPCMDSN and MAXCMDSN
    RFC3720:3.2.2.1 CMDSN > MAXCMDSN must be silently ignored by the target
    Send a TESTUNITREADY with CMDSN == MAXCMDSN+1. Should be ignored by the target.
    Send TESTUNITREADY (Expecting TIMEOUT)
    [FAILED] TESTUNITREADY successful but should have failed with NO SENSE(0x00)/NO ASCQ(0x0000)
    [FAILURE] We got a response from the target but SMDSN was outside of the window.
    Send a TESTUNITREADY with CMDSN == EXPCMDSN. should work again
    Send TESTUNITREADY (Expecting SUCCESS)
    [OK] TESTUNITREADY returned SUCCESS NO SENSE(0x00) (null)(0x0000)
FAILED
    1. test_iscsi_cmdsn_toohigh.c:78  - CU_ASSERT_EQUAL(ret,0)

iSCSICmdSnTooHigh.pcapng.zip