test: Verify precondition

Signed-off-by: Florian Pritz <bluewind@xinu.at>

test.py

@@ -12,6 +12,11 @@ class TestUploader(unittest.TestCase):
     def test_upload_pkg(self):
         mock_uploader = MagicMock()
         app = upload_pkg_internetarchive.ArchiveUploader(mock_uploader, DB.DB(':memory:'))
+
+        self.assertFalse(app.db.exists('fb-client-2.0.4-1-any.pkg.tar.xz'))
+        self.assertFalse(app.db.exists('fb-client-2.0.3-2-any.pkg.tar.xz'))
+        self.assertFalse(app.db.exists('fb-client-2.0.99-1-any.pkg.tar.xz'))
+
         app.main('./test-data/archive/packages/f/fb-client')
         app.main('./test-data/archive/packages/f/fb-client')