Add test file fixture.
Add test file fixture.

JohnMurga/linter,mdgriffith/linter,blakeembrey/linter,shawninder/linter,atom-community/linter,AsaAyers/linter,UltCombo/linter,AtomLinter/Linter,steelbrain/linter,Arcanemagus/linter,DanPurdy/linter,e-jigsaw/Linter,levity/linter,elkeis/linter,kaeluka/linter,iam4x/linter