From f08ea78e03634731ce3d57b168ad6cb19072350d Mon Sep 17 00:00:00 2001
From: Jean-Paul Calderone <exarkun@twistedmatrix.com>
Date: Tue, 2 Jun 2020 09:10:41 -0400
Subject: [PATCH] docstring

---
 src/_zkapauthorizer/tests/storage_common.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/_zkapauthorizer/tests/storage_common.py b/src/_zkapauthorizer/tests/storage_common.py
index e0e2c1a..5141dd5 100644
--- a/src/_zkapauthorizer/tests/storage_common.py
+++ b/src/_zkapauthorizer/tests/storage_common.py
@@ -272,6 +272,9 @@ class _PassFactory(object):
         return PassGroup(message, self, zip(passes, passes))
 
     def _clear(self):
+        """
+        Forget about all passes: returned, in use, spent, invalid, issued.
+        """
         del self.returned[:]
         self.in_use.clear()
         self.invalid.clear()
-- 
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