diff --git a/tests/tldptesttools.py b/tests/tldptesttools.py
index 52cf588..535a735 100644
--- a/tests/tldptesttools.py
+++ b/tests/tldptesttools.py
@@ -126,6 +126,8 @@ class TestInventoryBase(TestToolsFilesystem):
     def setupcollections(self):
         attrs = ('pubdir', 'sourcedir', 'sourcedirs')
         already = all([hasattr(self, x) for x in attrs])
+        if already:
+            return
         self.pubdir = os.path.join(self.tempdir, 'outputs')
         self.sourcedir = os.path.join(self.tempdir, 'sources')
         self.sourcedirs = [self.sourcedir]