Run focused unit tests in Vim, with a little help from Ruby.

README.md

• Move focus to somewhere on your PATH
• Drop focus.vim in ~/.vim/plugins
• Put focus on a key. I went with nnoremap <leader>tf :call Focus().
• Open a test/unit file, put your cursor inside a test method and run focus.
• Profit

focus

#!/usr/bin/env ruby

class Focus
  
  def initialize(filename)
    @filename = filename
  end

  def test_command(line_no)
    "ruby -Ilib:test #{@filename} --name #{test_for(line_no)}"
  end

  # Totally borrowed from Drew Olson
  # https://github.com/drewolson/ruby_focused_unit_test_vim/blob/master/plugin/ruby_focused_unit_test.vim
  def test_for(line_no)
    method_name = ''

    line_no.downto(1) do |l|
      line = contents[l]
      if line =~ /def (test_\w+)/
        method_name = $1
        break
      elsif line =~ /test "([^"]+)"/ || line =~ /test '([^']+)'/
        method_name = "test_" + $1.split(" ").join("_")
        break
      end
    end

    method_name
  end

  def contents
    @contents ||= File.read(@filename).split("\n")
  end

end

if __FILE__ == $0
  puts "focus <file> <line>" && exit(1) unless ARGV.length == 2

  file = ARGV[0]
  line = Integer(ARGV[1])

  focus = Focus.new(file)
  exec focus.test_command(line)
end

focus.vim

" TODO
" - put this in my vim config
" - decide how to bundle focus script
" - reap the benefits

function! Focus()
  let l = line('.')
  let f = expand('%')

  echom "You are on line " . l . " of file " . f
  exec "!ruby focus.rb " . f . " " . l
endfunction

focus_test.rb

require 'rubygems'
require 'active_support'
require 'test/unit'
require 'focus'

class FocusTest < ActiveSupport::TestCase

  def test_finds_the_name_for_a_normal_method
    test_name = "test_finds_the_name_for_a_normal_method"

    assert_equal test_name, focus.test_for(__LINE__)
    assert_equal "ruby -Ilib:test #{the_file} --name #{test_name}", focus.test_command(__LINE__)
  end

  test "finds the line for a sugared method" do
    test_name = "test_finds_the_line_for_a_sugared_method"
    assert_equal test_name, focus.test_for(__LINE__)
    assert_equal "ruby -Ilib:test #{the_file} --name #{test_name}", focus.test_command(__LINE__)
  end

  def focus
    Focus.new(the_file)
  end

  def the_file
    __FILE__
  end

end