After the Mets at first said he would sit, Jose Reyes tested his left hamstring and now plans to play tonight against the Nationals. Reyes — who had missed the past two games — will be in the leadoff spot, followed by Ryan Church. Slumping second baseman Luis Castillo has bumped down to the eighth spot, just two days after Willie Randolph called him “one of the better No. 2 hitters in baseball.”