new_contents: import unittest
  import mozart as mz
  import numpy as np
  
  class TestStocMethods(unittest.TestCase):
  
  	def test_upper(self):
  		self.assertEqual('foo'.upper(), 'FOO')
  
  	def test_isupper(self):
  		self.assertTrue('FOO'.isupper())
  		self.assertFalse('Foo'.isupper())
  
  	def test_test(self):
  		self.assertTrue(True)
subject: add testcase