CREATE TABLE table_48937 ("Opposing Team" TEXT, "Against" FLOAT, "Date" TEXT, "Venue" TEXT, "Status" TEXT)

Which Date has an Against smaller than 21, and a Status of second test?
SELECT "Date" FROM table_48937 WHERE "Against" < '21' AND "Status" = 'second test'
SELECT "Date" FROM "table_48937" WHERE "Against" < '21' AND "Status" = 'second test'