tests: empty media fields before test_asset_template_tags (#24453)

tests/test_public_templatetags.py

@@ -1,3 +1,4 @@
+import shutil
 from StringIO import StringIO
 
 import pytest
@@ -130,6 +131,11 @@ def test_get_group():
     assert t.render(context) == 'New York,Chicago,'
 
 def test_asset_template_tags():
+    for path in ('uploads', 'assets'):
+        if os.path.exists(default_storage.path(path)):
+            shutil.rmtree(default_storage.path(path))
+    assert Asset.objects.count() == 0
+
     with override_settings(COMBO_ASSET_SLOTS={'collectivity:banner': {'label': 'Banner'}}):
         t = Template('''{% load assets %}{% get_asset "collectivity:banner" as banner %}{% if banner %}BANNER{% endif %}''')
         assert t.render(Context()) == ''