Before: call ale#assert#SetUpFixerTest('typescript', 'biome') After: call ale#assert#TearDownFixerTest() Execute(The default biome command should be correct): call ale#test#SetFilename('../test-files/typescript/test.ts') AssertFixer \ { \ 'read_temporary_file': 1, \ 'command': ale#Escape('biome') \ . ' format %t' \ }