R Under development (unstable) (2024-01-07 r85787 ucrt) -- "Unsuffered Consequences"
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> if (require(RUnit)) {
+   library(FeatureHashing)
+   df <- data.frame(b = c("1,2", "1,,3", ",2,3"), stringsAsFactors = FALSE)
+   m <- hashed.model.matrix(~ split(b), df, create.mapping = TRUE)
+   mapping <- hash.mapping(m)
+   checkTrue(all.equal(sort(names(mapping)), paste("b", 1:3, sep="")), "the default split is incorrect")
+   m <- hashed.model.matrix(~ split(b, delim = "2"), df, create.mapping = TRUE)
+   mapping <- hash.mapping(m)
+   checkTrue(all.equal(sort(names(mapping)),
+                       sort(paste("b", unique(unlist(strsplit(df$b, "2", fixed = TRUE))), sep=""))
+   ), "the delim of split is incorrect")
+   m <- hashed.model.matrix(~ split(b, delim = ",", type = "count"), df, create.mapping = TRUE)
+   mapping <- hash.mapping(m)
+   checkTrue(all.equal(sort(names(mapping)), paste("b", 1:3, sep="")), "the default split is incorrect")
+   for(key in names(mapping)) {
+     pattern <- substring(key, 2, nchar(key))
+     checkTrue(all.equal(sum(grepl(pattern, df$b, fixed=TRUE)), sum(abs(m[,mapping[[key]]]))),
+               "The value is inconsistent")
+   }
+ }
Loading required package: RUnit
> 
> proc.time()
   user  system elapsed 
   1.92    0.28    2.18