Before: call ale#assert#SetUpLinterTest('eruby', 'erubis') After: call ale#assert#TearDownLinterTest() Execute(Executable should not contain any filter code by default): call ale#test#SetFilename('../ruby_fixtures/not_a_rails_app/file.rb') AssertLinter 'erubis', 'erubis -x %t | ruby -c' Execute(Executable should filter invalid eRuby when inside a Rails project): call ale#test#SetFilename('../ruby_fixtures/valid_rails_app/app/views/my_great_view.html.erb') AssertLinter 'erubis', \ 'ruby -r erubis -e ' . ale#Escape('puts Erubis::Eruby.new($stdin.read.gsub(%{<%=},%{<%})).src') . '< %t | ruby -c'