Before:
call ale#assert#SetUpLinterTest('php', 'phpmd')
After:
call ale#assert#TearDownLinterTest()
Execute(Custom executables should be used for the executable and command):
let g:ale_php_phpmd_executable = 'phpmd_test'
AssertLinter 'phpmd_test',
\ ale#Escape('phpmd_test')
\ . ' %s text cleancode,codesize,controversial,design,naming,unusedcode --ignore-violations-on-exit %t'