Test Fails at EXPECT_GE(sleep_time, 0);

[xMHW]

When I'm trying to run test-kens-transfer-unreliable test case TestTransfer_Connect_Send_Symmetric in my Linux machine I'm getting an error as follows

KENSv3/app/kens/testtransfer.cpp:248: Failure
Expected: (sleep_time) >= (0), actual: -536002 vs 0

KENSv3/app/kens/testtransfer.cpp:111: Failure
Expected: (sleep_time) >= (0), actual: -538003 vs 0

which corresponds to

    struct timeval tv;
    ret = gettimeofday(&tv, 0);
    EXPECT_EQ(ret, 0);

    long sleep_time = start_time - (1000 * 1000 * tv.tv_sec) - tv.tv_usec;
    EXPECT_GE(sleep_time, 0);

This code block (EXPECT_GE(sleep_time, 0))
It didn't happen for reliable test for the same case(Also, in my macOS machine, it doesn't fail either for unreliable case).
So, I don't think this is the problem of my implementation.
Could you help me get rid of this problem?
Otherwise, can I just comment out those lines? (BTW, after commenting out those two lines, I pass the test cases)

++
Also, it fails when I run test-kens-close-unreliable too. TestEnv_Any.TestClose_Connect_CloseFirst, TestEnv_Any.TestClose_Connect_CloseLater, TestEnv_Any.TestClose_Connect_CloseSimultaneous

KENSv3/app/kens/testclose.cpp:140: Failure
Expected: (sleep_time) >= (0), actual: -526002 vs 0

KENSv3/app/kens/testclose.cpp:86: Failure
Expected: (sleep_time) >= (0), actual: -518003 vs 0

Same as above, comment out then test pass.
Only happens for unreliable case.

Also, below is the full list of test cases where this error happens

test-kens-transfer-unreliable
[  FAILED  ] 6 tests, listed below:
[  FAILED  ] TestEnv_Any.TestTransfer_Connect_Send_Symmetric
[  FAILED  ] TestEnv_Any.TestTransfer_Connect_Send_EOF
[  FAILED  ] TestEnv_Any.TestTransfer_Connect_Recv_Symmetric
[  FAILED  ] TestEnv_Any.TestTransfer_Connect_Recv_EOF
[  FAILED  ] TestEnv_Any.TestTransfer_Connect_Recv_SmallBuffer1
[  FAILED  ] TestEnv_Any.TestTransfer_Connect_Recv_SmallBuffer2
test-kens-close-unreliable
[  FAILED  ] 3 tests, listed below:
[  FAILED  ] TestEnv_Any.TestClose_Connect_CloseFirst
[  FAILED  ] TestEnv_Any.TestClose_Connect_CloseLater
[  FAILED  ] TestEnv_Any.TestClose_Connect_CloseSimultaneous

[Pusnow]

No, please do not comment out the lines.

It seems your connection establishment is too slow (maybe due to drops?).
Please try to shorten the connection establishment time.

[xMHW]

Ok, I'll try that out.