old_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)
new_contents: import unittest
  
  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)
  
  	def test_import(self):
  		import mozart as mz
  		self.assertTrue(True)
  
  	def test_authors(self):
  		import mozart as mz
  		authors = ('Yoon-gu Hwang <yz0624@gmail.com>', 'Dong-Wook Shin <dwshin.yonsei@gmail.com>', 'Ji-Yeon Suh <suh91919@naver.com>')
  		self.assertEqual(mz.__author__, authors)
subject: add import test and author check