Before: Save g:ale_cs_dotnet_format_executable Save g:ale_cs_dotnet_format_options " Use an invalid global executable, so we don't match it. let g:ale_cs_dotnet_format_executable = 'xxxinvalid' let g:ale_cs_dotnet_format_options = '' call ale#test#SetDirectory('/testplugin/test/fixers') After: Restore call ale#test#RestoreDirectory() Execute(The dotnet format callback should return the correct default values): call ale#test#SetFilename('../test-files/cs/testfile.cs') AssertEqual \ { \ 'read_temporary_file': 1, \ 'command': ale#Escape('xxxinvalid') \ . ' format' \ . ' --folder --include %t "$(dirname %t)"', \ }, \ ale#fixers#dotnet_format#Fix(bufnr('')) Execute(The dotnet format callback should include custom dotnet format options): let g:ale_cs_dotnet_format_options = "-l 80" call ale#test#SetFilename('../test-files/cs/testfile.cs') AssertEqual \ { \ 'read_temporary_file': 1, \ 'command': ale#Escape('xxxinvalid') \ . ' format' \ . ' ' . g:ale_cs_dotnet_format_options \ . ' --folder --include %t "$(dirname %t)"', \ }, \ ale#fixers#dotnet_format#Fix(bufnr(''))