FLC OF AN EMBRAER EMB120 REJECTED TKOF AFTER THEY HAD TKOF WARNING INDICATION WHEN APPLYING FULL PWR CAUSED BY NOT EXTENDING TKOF FLAPS.

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TAXIING OUT FROM THE GATE; I CALLED FOR 'FLAPS 15 DEGS; TAXI CHK.' THE FO RESPONDED THAT HE WAS GOING TO RUN THE FIRST FLT OF THE DAY ANTI-ICE TESTS ON THE WAY OUT TO THE RWY. THIS ITEM NORMALLY COMES AT THE END OF THE BEFORE TKOF CHK AND WILL RESULT IN A DELAY AT THE RWY IF THERE IS A SHORT TAXI. I BELIEVE THAT THIS DISTR LED HIM TO BEGIN THE CHALLENGE/RESPONSE TAXI CHKLIST WITHOUT FIRST SELECTING THE FLAP LEVER TO 15 DEGS AS HE NORMALLY WOULD. THE 'FLAPS' CHALLENGE IS THE 4TH ITEM ON THE 8-ITEM CHKLIST. THE NORMAL RESPONSE IS TO VISUALLY CONFIRM THAT THE FLAP LEVER IS IN THE 15 DEG SETTING; AND THE WEIGHTED AVERAGE INDICATORS SHOWS 15 DEGS; AND THEN RESPOND VERBALLY 'SET 15 DEGS/INDICATING 15 DEGS.' IN RETROSPECT; I DO NOT RECALL DOING ANY OF THESE THINGS. I BELIEVE THAT THE 'FLAPS' CHALLENGE/RESPONSE ITEM WAS MISSED BECAUSE IT WAS ABOUT TO BE ADDRESSED AS WE APCHED ANOTHER RWY AND WE EACH VISUALLY AND VERBALLY VERIFIED THAT IT WAS CLR OF TFC AND WE WERE CLRED TO CROSS. THIS BROKE THE CONTINUITY OF THE CHKLIST AND ALLOWED THE OMISSION TO GO UNNOTICED. THE TKOF WAS REJECTED WHEN A CONFIGN WARNING OCCURRED AS THE PWR LEVERS WERE ADVANCED FOR TKOF.