title: Creating test-suite with pytest in py file
body: <p>I have two tests created with pytest: <strong>Test1</strong> and <strong>Test2</strong>.
  I would like to create method which would start whose two tests. I know that i can do it with cmd, but i prefer py file. 
  In unittest there are testloader and testsuite methods:</p>
  
  <pre><code>t1 = unittest.TestLoader().loadTestsFromTestCase(Test1)
  t2 = unittest.TestLoader().loadTestsFromTestCase(Test2)
  test_suite = unittest.TestSuite([t1, t2])
  unittest.TextTestRunner(verbosity=2).run(test_suite)
  </code></pre>
  
  <p>I need same thing, but for py test</p>