ale/test/test_format_temporary_file_...

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Before:
let g:output = []
function! TestCallback(buffer, output)
let g:output = a:output
return []
endfunction
call ale#linter#Define('foobar', {
\ 'name': 'testlinter',
\ 'callback': 'TestCallback',
\ 'executable': 'cat',
\ 'command': 'cat %t',
\})
After:
unlet! g:output
delfunction TestCallback
call ale#linter#Reset()
Given foobar (Some imaginary filetype):
foo
bar
baz
Execute(ALE should be able to read the %t file):
AssertEqual 'foobar', &filetype
" Sleep a little so the test passes more.
sleep 100ms
call ale#Lint()
call ale#engine#WaitForJobs(2000)
AssertEqual ['foo', 'bar', 'baz'], g:output