new_contents: # -*- coding: utf-8 -*-
  import unittest
  
  from brew.utilities.efficiency import calculate_brew_house_yield
  from fixtures import recipe
  
  
  class TestEfficiencyUtilities(unittest.TestCase):
  
      def setUp(self):
          self.recipe = recipe
  
      def test_calculate_brew_house_yield(self):
          out = calculate_brew_house_yield(recipe.start_volume,
                                           recipe.og,
                                           recipe.grain_additions)
          expected = 0.98
          self.assertEquals(round(out, 3), expected)
  
subject: Add tests for calculating brew house yield