old_contents: from __future__ import print_function, unicode_literals
  
  import unittest
  from ggplot import *
  
  class TestGeomHistogram(unittest.TestCase):
  
      def test_geom_histogram(self):
          gghist = ggplot(meat, aes(x='veal')) + geom_histogram()
          self.assertTrue(type(gghist) == ggplot)
          print(gghist)
  
      def test_binwidth(self):
          gghist = ggplot(meat, aes(x='veal')) + geom_histogram(binwidth=10)
          print gghist
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: from __future__ import print_function, unicode_literals
  
  import unittest
  from ggplot import *
  
  class TestGeomHistogram(unittest.TestCase):
  
      def test_geom_histogram(self):
          gghist = ggplot(meat, aes(x='veal')) + geom_histogram()
          self.assertTrue(type(gghist) == ggplot)
          print(gghist)
  
      def test_binwidth(self):
          gghist = ggplot(meat, aes(x='veal')) + geom_histogram(binwidth=10)
          print(gghist)
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Fix missing paren in tests/test_geom_histogram.py