Boss Mark Stimson believes relegation-threatened Margate’s weekend trip will be a test of his players’ mettle. Stimson will again seek his first win since taking charge of Gate last month at mid-table Whitehawk this Saturday. Margate are only two points clear of the bottom four after their New Year’s Day 2-0 home derby defeat to Folkestone and haven’t won since November 4. After Whitehawk, Margate will return to Hartsdown Park for matches against basement boys Concord on Saturday, January 13, and Bognor seven days later. “They’re tough games but games we should be looking forward to,” said Sti…