CBTF: Caught by the Fuzz!

A very simple mechanism to fuzz-test the exported functions of an R package. At the moment this is extremely limited: it operates only on the first argument and it doesn’t introduce any randomness. However, it’s convenient when there are a large number of functions to test.

Usage

library(CBTF)
funs <- get_exported_functions("mime")
what <- TRUE
fuzz(funs, what)

## 
##  🚨   CAUGHT BY THE FUZZ!   🚨
## 
## FAIL: guess_type ( logical )
##     a character vector argument expected 
## 
## FAIL: parse_multipart ( logical )
##     $ operator is invalid for atomic vectors

The first occurrence is a false positive, as the message returned indicates that the input was checked and the function returned cleanly. The second case instead reveals that the function didn’t validate its input: indeed, it expected an environment, and used the $ operation on it without checking.