added an engine-specific option

Author: topepo

tests/testthat/test_boost_tree_C50.R

@@ -15,7 +15,7 @@ lending_club_fail <-
 num_pred <- c("funded_amnt", "annual_inc", "num_il_tl")
 lc_basic <-
   boost_tree(mode = "classification")  %>%
-      set_engine("C5.0")
+      set_engine("C5.0", bands = 2)
 
 ctrl <- fit_control(verbosity = 1, catch = FALSE)
 caught_ctrl <- fit_control(verbosity = 1, catch = TRUE)