Before: call ale#assert#SetUpLinterTest('handlebars', 'embertemplatelint') GivenCommandOutput ['1.6.0'] After: call ale#assert#TearDownLinterTest() Execute(ember-template-lint executables runs the right command): AssertLinter 'ember-template-lint', \ ale#Escape('ember-template-lint') . ' --json --filename %s' Execute(old ember-template-lint executables runs the right command): GivenCommandOutput [] AssertLinter 'ember-template-lint', \ ale#Escape('ember-template-lint') . ' --json %t'