changed fixture scope to session

tests/conftest.py

@@ -93,7 +93,7 @@ def increment_cache_key_prefix():
         cache.set(prefix_counter_cache_key, key_prefix_counter)
     cache.key_prefix = "t{0}".format(key_prefix_counter)
 
-@pytest.fixture(scope='module')
+@pytest.fixture(scope='session')
 def sample_data():
     """Returns a SampleData() object"""
     from sampledata import SampleData