title: Run slow Pytest commands at the end of the test suite
body: <p>Let's say I have the following pytest script:</p>
  
  <pre><code>import pytest
  
  def test_one():
      pass
  
  def test_two():
      pass
  
  @pytest.mark.slow
  def test_three():
      pass
  </code></pre>
  
  <p>Is there a single command I can use to run all tests with the <code>slow</code> marker last? I know I can do this using two pytest commands but it would be great to do this using a single command:</p>
  
  <pre><code>pytest -v -m "not slow"
  # test_markers.py::test_one PASSED                                                                                                                    
  # test_markers.py::test_two PASSED
  
  pytest -v -m slow
  # test_markers.py::test_three PASSED
  </code></pre>