new_contents: import os.path
  import sys
  TEST_ROOT = os.path.dirname(__file__)
  sys.path.insert(1, os.path.join(TEST_ROOT, "tests"))
  import glob
  import unittest
  
  
  test_file_strings = glob.glob('tests/test_*.py')
  module_strings = [str[len('tests/'):len(str) - len('.py')]
                    for str in test_file_strings]
  suites = [unittest.defaultTestLoader.loadTestsFromName(str) for str
            in module_strings]
  testSuite = unittest.TestSuite(suites)
  text_runner = unittest.TextTestRunner().run(testSuite)
  
subject: Add a test_runner to run all test without IDE.