Before:
  Save g:ale_cs_mcs_options

  unlet! g:ale_cs_mcs_options

  runtime ale_linters/cs/mcs.vim

  let b:command_tail = ' -unsafe --parse'

After:
  Restore
  unlet! b:command_tail
  unlet! b:ale_cs_mcs_options
  call ale#linter#Reset()

Execute(Check for proper default command):

  let b:command = ale_linters#cs#mcs#GetCommand(bufnr(''))
  let b:command = substitute(b:command,'\s\+',' ','g')

  AssertEqual
  \  b:command,
  \  'mcs -unsafe --parse %t'

Execute(The options should be be used in the command):

  let b:ale_cs_mcs_options = '-pkg:dotnet'
  let b:command = ale_linters#cs#mcs#GetCommand(bufnr(''))
  let b:command = substitute(b:command,'\s\+',' ','g')

  AssertEqual
  \ b:command,
  \ 'mcs' . b:command_tail . ' ' . b:ale_cs_mcs_options . ' %t',