The function of avajs message parameter

such as

test("my test",(t)=>{
    t.is(1,1,"message")
})

t.is what is the use of the third parameter? During the execution, I didn"t see his output

.
Jul.23,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b34c2a-404c8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b34c2a-404c8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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