Before:
  Save g:ale_c_parse_makefile
  let g:ale_c_parse_makefile = 0

  let g:get_cflags_return_value = ''

  runtime autoload/ale/c.vim

  function! ale#c#GetCFlags(buffer, output) abort
    return g:get_cflags_return_value
  endfunction

  call ale#assert#SetUpLinterTest('cpp', 'gcc')
  let b:command_tail = ' -S -x c++'
  \   . ' -o ' . (has('win32') ? 'nul': '/dev/null')
  \   . ' -iquote ' . ale#Escape(getcwd())
  \   . ' -std=c++14 -Wall -'

After:
  unlet! g:get_cflags_return_value
  unlet! b:command_tail

  runtime autoload/ale/c.vim

  call ale#assert#TearDownLinterTest()

Execute(The executable should be configurable):
  AssertLinter 'gcc', ale#Escape('gcc') . b:command_tail

  let b:ale_cpp_gcc_executable = 'foobar'

  AssertLinter 'foobar', ale#Escape('foobar') . b:command_tail

Execute(The -std flag should be replaced by parsed C flags):
  let b:command_tail = substitute(b:command_tail, 'c++14', 'c++11 ', '')
  let g:get_cflags_return_value = '-std=c++11'

  AssertLinter 'gcc', ale#Escape('gcc') . b:command_tail