Before: call ale#assert#SetUpLinterTest('c', 'cppcheck') let b:command_tail = ' -q --language=c --enable=style -I' . ale#Escape(ale#path#Simplify(g:dir)) .' %t' After: " Remove a test file we might open for some tests. if &buftype != 'nofile' :q! set buftype=nofile endif call ale#assert#TearDownLinterTest() unlet! b:command_tail Execute(The executable should be configurable): AssertLinter 'cppcheck', ale#Escape('cppcheck') . b:command_tail let b:ale_c_cppcheck_executable = 'foobar' AssertLinter 'foobar', ale#Escape('foobar') . b:command_tail Execute(cppcheck for C should detect compile_commands.json files): call ale#test#SetFilename('cppcheck_paths/one/foo.c') AssertLinter 'cppcheck', \ ale#path#CdString(ale#path#Simplify(g:dir . '/cppcheck_paths/one')) \ . ale#Escape('cppcheck') \ . ' -q --language=c --project=''compile_commands.json'' --enable=style %t' Execute(cppcheck for C should detect compile_commands.json files in build directories): call ale#test#SetFilename('cppcheck_paths/with_build_dir/foo.cpp') AssertLinter 'cppcheck', \ ale#path#CdString(ale#path#Simplify(g:dir . '/cppcheck_paths/with_build_dir')) \ . ale#Escape('cppcheck') \ . ' -q --language=c' \ . ' --project=' . ale#Escape(ale#path#Simplify('build/compile_commands.json')) \ . ' --enable=style %t' Execute(cppcheck for C should include file dir if compile_commands.json file is not found): call ale#test#SetFilename('cppcheck_paths/foo.cpp') AssertLinter 'cppcheck', \ ale#Escape('cppcheck') \ . ' -q --language=c' \ . ' --enable=style' \ . ' -I' . ale#Escape(ale#path#Simplify(g:dir . '/cppcheck_paths')) \ . ' %t' Execute(cppcheck for C should ignore compile_commands.json file if buffer is modified): call ale#test#SetFilename('cppcheck_paths/one/foo.c') set buftype= set modified AssertLinter 'cppcheck', \ ale#path#CdString(ale#path#Simplify(g:dir . '/cppcheck_paths/one')) \ . ale#Escape('cppcheck') \ . ' -q --language=c' \ . ' --enable=style' \ . ' -I' . ale#Escape(ale#path#Simplify(g:dir . '/cppcheck_paths/one')) \ . ' %t'