Integration tests are useful in detecting breakages but much slower so
let's only use one per command and install formula outside the
integration test framework (which is also slow).
Fix the error:
Error: wrong number of arguments (given 1, expected 2)
/projects/btl_scratch/sjackman/brew/Homebrew/Library/Homebrew/exceptions.rb:550:in `block in initialize'
/projects/btl_scratch/sjackman/brew/Homebrew/Library/Homebrew/exceptions.rb:559:in `map'
