new_contents: #! /usr/bin/env python
  import os
  import textwrap
  import argparse
  
  import pkg_resources
  import pytest
  
  
  def test(package, input_file=None, verbosity=None, bmi_version='1.1'):
      tests = [
          pkg_resources.resource_filename(__name__, os.path.join('tests_pytest'))
      ]
      os.environ['BMITEST_CLASS'] = package
      os.environ['BMITEST_INPUT_FILE'] = input_file
      os.environ['BMI_VERSION_STRING'] = bmi_version
  
      if verbosity:
          tests += ['-' + 'v' * verbosity]
      pytest.main(tests)
  
  
  def configure_parser_test(sub_parsers=None):
      help = "Test a BMI class."
  
      example = textwrap.dedent("""
  
      Examples:
  
      bmi test bmimodule:BmiClass
      """)
  
      if sub_parsers is None:
          p = argparse.ArgumentParser(
              description=help,
              fromfile_prefix_chars='@',
              epilog=example,
              formatter_class=argparse.ArgumentDefaultsHelpFormatter
          )
      else:
          p = sub_parsers.add_parser(
              'test',
              help=help,
              description=help,
              epilog=example,
              formatter_class=argparse.ArgumentDefaultsHelpFormatter
          )
  
      p.add_argument(
          'cls',
          help='Full name of class to test.',
      )
      p.add_argument(
          '--infile',
          default='',
          help='Name of input file for init method.',
      )
      p.add_argument(
          '--bmi-version',
          default='1.1',
          help='BMI version to test against',
      )
      p.add_argument(
          '-v', '--verbose',
          action='count',
          dest='verbose',
          default=1,
          help='increase verbosity',
      )
      p.add_argument(
          '--no-doctests',
          action='store_false',
          dest='doctests',
          default=True,
          help='Do not run doctests in module',
      )
      p.set_defaults(func=execute)
  
      return p
  
  
  def execute(args):
      test(args.cls, input_file=args.infile, verbosity=args.verbose,
           bmi_version=args.bmi_version)
  
  
  def main():
      p = configure_parser_test()
  
      args = p.parse_args()
  
      sys.exit(args.func(args))
  
subject: Add bmi-test command that uses pytest.