Before:
call ale#assert#SetUpLinterTest('graphql', 'gqlint')
After:
call ale#assert#TearDownLinterTest()
Execute(The linter should run from the directory of the file in the buffer):
AssertLinter 'gqlint',
\ ale#path#CdString(expand('%:p:h'))
\ . 'gqlint --reporter=simple'
\ . ' %t'