title: parametrize and running a single test in pytest
body: <p>How can I run a single test out of a set configured with parametrize?
  Let's say I have the following test method:</p>
  
  <pre><code>@pytest.mark.parametrize(PARAMETERS_LIST, PARAMETERS_VALUES)
  def test_my_feature(self, param1, param2, param3):
      """
      test doc
      """
      if param1 == 'value':
          assert True
      else:
          print 'not value'
          assert False
  </code></pre>
  
  <p>I have 3 parameters, and I generate a list of 15 different possible values for them, to test the function on.</p>
  
  <p>How can I run just one of them? except for the obvious way - giving a single value instead of 15.</p>