diff -r 7c3ef55dedbe -r 68c43a416585 tests/test-atomictempfile.py
--- a/tests/test-atomictempfile.py	Sat May 13 11:42:42 2017 -0700
+++ b/tests/test-atomictempfile.py	Sat May 13 11:52:44 2017 -0700
@@ -47,7 +47,8 @@
     # if a programmer screws up and passes bad args to atomictempfile, they
     # get a plain ordinary TypeError, not infinite recursion
     def testoops(self):
-        self.assertRaises(TypeError, atomictempfile)
+        with self.assertRaises(TypeError):
+            atomictempfile()
 
     # checkambig=True avoids ambiguity of timestamp
     def testcheckambig(self):