Before:
call ale#assert#SetUpLinterTest('haskell', 'hdevtools')
let b:command_tail = ' check -g -Wall -p %s %t'
After:
unlet! b:command_tail
call ale#assert#TearDownLinterTest()
Execute(The executable should be configurable):
AssertLinter 'hdevtools', ale#Escape('hdevtools') . b:command_tail
let b:ale_haskell_hdevtools_executable = 'foobar'
AssertLinter 'foobar', ale#Escape('foobar') . b:command_tail