Python nosestests running in vim

vimrc_snippet.vim

""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
" SWITCH BETWEEN TEST AND PRODUCTION CODE
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
function! OpenTestAlternate()
  let new_file = AlternateForCurrentFile()
  exec ':e ' . new_file
endfunction
function! AlternateForCurrentFile()
  let current_file = expand("%")
  let current_path = expand("%:h")
  let new_file = expand("%:t")
  let in_tests = match(current_file, '^tests/') != -1
  let going_to_tests = !in_tests
  if going_to_tests
    let new_file = substitute(new_file, '^', 'test_', '')
    let new_file = 'tests/' . current_path . '/' . new_file
  else
    let new_file = substitute(new_file, 'test_', '', '')
    let new_path = substitute(current_path, '^tests/', '', '')
    let new_file = new_path . '/' . new_file
  endif
  return new_file
endfunction
nnoremap <leader>. :call OpenTestAlternate()<cr>


""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
" RUNNING TESTS
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
map <leader>t :call RunTestFile()<cr>
map <leader>T :call RunNearestTest()<cr>
map <leader>a :call RunTests('')<cr>
map <leader>c :w\|:!script/features<cr>
map <leader>w :w\|:!script/features --profile wip<cr>

function! RunTestFile(...)
    if a:0
        let command_suffix = a:1
    else
        let command_suffix = ""
    endif

    " Run the tests for the previously-marked file.
    let in_test_file = match(expand("%:t"), '^test_.*\.py$') != -1
    if in_test_file
        call SetTestFile()
    elseif !exists("t:grb_test_file")
        return
    end
    call RunTests(t:grb_test_file . command_suffix)
endfunction

function! RunNearestTest()
    let tests_line_number = line('.')
    call RunTestFile(":" . tests_line_number . " -b")
endfunction

function! SetTestFile()
    " Set the tests file that tests will be run for.
    let t:grb_test_file=@%
endfunction

function! RunTests(filename)
    " Write the file and run tests for the given filename
    :w
    :silent !echo;echo;echo;echo;echo;echo;echo;echo;echo;echo
    :silent !echo;echo;echo;echo;echo;echo;echo;echo;echo;echo
    :silent !echo;echo;echo;echo;echo;echo;echo;echo;echo;echo
    :silent !echo;echo;echo;echo;echo;echo;echo;echo;echo;echo
    :silent !echo;echo;echo;echo;echo;echo;echo;echo;echo;echo
    :silent !echo;echo;echo;echo;echo;echo;echo;echo;echo;echo

    exec "!nosetests " . a:filename
endfunction