update test

Author: Mukulyadav2004

inst/tests/tests.Rraw

@@ -21089,4 +21089,4 @@ test(2308.02, fread("date\nNA\n2014-12-05", keepLeadingZeros=FALSE), dt)
 x <- data.frame(t = c(3:1,4:5), y = 1:5)
 class(x) <- c("tbl_df", "tbl", "data.frame")
 test(2309.01, {key(as.data.table(x, key = "t"))}, "t")
-test(2309.02, key(as.data.table(data.table(t = c(3:1,4:5), key = "t"))), NULL)
+test(2309.02, key(as.data.table(data.table(t = c(3:1,4:5), key = "t"))), "t")