Before:
  Save g:ale_run_synchronously
  Save g:ale_linters
  Save g:ale_history_log_output
  Save g:ale_cpp_gcc_options

  silent! cd /testplugin/test/c_tests

  let g:ale_run_synchronously = 1
  let g:ale_linters = {'c': ['gcc'], 'cpp': ['g++']}
  let g:ale_history_log_output = 1
  let g:ale_cpp_gcc_options = '-Wall'

  function! GetCommandOutput()
    if empty(g:ale_buffer_info[bufnr('')].history)
      return ''
    endif

    return join(g:ale_buffer_info[bufnr('')].history[-1].output, "\n")
  endfunction

After:
  Restore
  delfunction GetCommandOutput
  call ale#linter#Reset()
  call ale#engine#SetResults(bufnr(''), [])
  call ale#cleanup#Buffer(bufnr(''))

Given c (A test C file):
  int main() {
    return 0
  }

Execute(Basic errors should be returned for GCC for C files):
  call ale#Lint()

  AssertEqual [{
  \   'lnum': 3,
  \   'col': 1,
  \ }],
  \ map(getloclist(0), '{''lnum'': v:val.lnum, ''col'': v:val.col}'),
  \ 'No errors returned! Got: ' . GetCommandOutput()

  Assert match(getloclist(0)[0].text, '\v^expected .*;.* before .*\}.* token$') >= 0,
  \ 'Invalid error text: ' .  getloclist(0)[0].text

Given cpp (A test C++ file):
  int main() {
    return 0
  }

Execute(Basic errors should be returned for GCC for C++ files):
  call ale#Lint()

  AssertEqual [{
  \   'lnum': 3,
  \   'col': 1,
  \ }],
  \ map(getloclist(0), '{''lnum'': v:val.lnum, ''col'': v:val.col}'),
  \ 'No errors returned! Got: ' . GetCommandOutput()

  Assert match(getloclist(0)[0].text, '\v^expected .*;.* before .*\}.* token$') >= 0,
  \ 'Invalid error text: ' .  getloclist(0)[0].text