ultimate-vim/sources_non_forked/vim-go/autoload/go/fmt_test.vim

func! Test_run_fmt() abort
  let actual_file = tempname()
  call writefile(readfile("test-fixtures/fmt/hello.go"), actual_file)

  let expected = join(readfile("test-fixtures/fmt/hello_golden.go"), "\n")

  " run our code
  call go#fmt#run("gofmt", actual_file, "test-fixtures/fmt/hello.go")

  " this should now contain the formatted code
  let actual = join(readfile(actual_file), "\n")

  call assert_equal(expected, actual)
endfunc

func! Test_update_file() abort
  let expected = join(readfile("test-fixtures/fmt/hello_golden.go"), "\n")
  let source_file = tempname()
  call writefile(readfile("test-fixtures/fmt/hello_golden.go"), source_file)

  let target_file = tempname()
  call writefile([""], target_file)

  " update_file now
  call go#fmt#update_file(source_file, target_file)

  " this should now contain the formatted code
  let actual = join(readfile(target_file), "\n")

  call assert_equal(expected, actual)
endfunc

func! Test_goimports() abort
  let $GOPATH = 'test-fixtures/fmt/'
  let actual_file = tempname()
  call writefile(readfile("test-fixtures/fmt/src/imports/goimports.go"), actual_file)

  let expected = join(readfile("test-fixtures/fmt/src/imports/goimports_golden.go"), "\n")

  " run our code
  call go#fmt#run("goimports", actual_file, "test-fixtures/fmt/src/imports/goimports.go")

  " this should now contain the formatted code
  let actual = join(readfile(actual_file), "\n")

  call assert_equal(expected, actual)
endfunc

" vim: sw=2 ts=2 et