ale/test/test_tmpdir_wrapper.vader

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Before:
Save $TMPDIR
After:
Restore
Execute(ale#util#Tempname should create files in /tmp if $TMPDIR isn't set):
if has('unix')
let $TMPDIR = ''
Assert ale#util#Tempname() =~# '^/tmp'
" We should unlet the environment variable again.
AssertEqual '', $TMPDIR
endif