Begin tests for trigger.py

src/zope/server/tests/test_trigger.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+"""
+Tests for trigger.py
+
+"""
+
+import unittest
+
+from zope.server import trigger
+
+class TestFunctions(unittest.TestCase):
+
+    def test_positive_id(self):
+
+        trigger.id = lambda o: -42
+        try:
+            # This is possibly only correct on 64-bit platforms
+            self.assertEqual(18446744073709551574L,
+                             trigger.positive_id(None))
+        finally:
+            del trigger.id

src/zope/server/trigger.py

@@ -22,7 +22,7 @@
 _ADDRESS_MASK = 256 ** struct.calcsize('P')
 def positive_id(obj):
     """Return id(obj) as a non-negative integer."""
-
+    # Note that the output depends on the size of void* on the platform.
     result = id(obj)
     if result < 0:
         result += _ADDRESS_MASK