title: How to share data (like temporary path) between Django unit tests
body: <pre><code>class MyTestCaseA(TestCase):
      def setUp(self):
          # some setup here...
  
      def test_case(self):
          # some test
  
  class MyTestCaseB(TestCase):
      def setUp(self):
          # some setup here...
  
      def test_case(self):
          # some test
  </code></pre>
  
  <p>I would need to share data between MyTestCaseA and MyTestCaseB. In my case, I want to share the path to a folder created for each execution of the test (through "manage.py test myapp"). In my case, I will take screenshots of the browser (using selenium) and I want to store all the screenshots taken in my various test cases in the same temporary folder.</p>
  
  <p>If I create a temporary folder in the SetUp function, then each test case will have a different temporary folder.</p>