Before: call ale#assert#SetUpLinterTest('fuse', 'fusionlint') After: call ale#assert#TearDownLinterTest() Execute(The fuse fusionlint command callback should return the correct default string): AssertLinter 'fusion-lint', ale#Escape('fusion-lint') . ' --filename %s -i' Execute(The fuse fusionlint command callback should let you set options): let g:ale_fuse_fusionlint_options = '--example-option argument' AssertLinter 'fusion-lint', \ ale#Escape('fusion-lint') . ' --example-option argument --filename %s -i' Execute(The fusionlint executable should be configurable): let g:ale_fuse_fusionlint_executable = 'foobar' AssertLinter 'foobar', ale#Escape('foobar') . ' --filename %s -i'