1 files changed, 14 insertions, 0 deletions
diff --git a/mock/tests/testsupport.py b/mock/tests/testsupport.py
new file mode 100644
index 0000000..4882572
--- /dev/null
+++ b/mock/tests/testsupport.py
@@ -0,0 +1,14 @@
+# Tests to make sure helpers we backport are actually working!
+from unittest import TestCase
+
+from .support import uncache
+
+
+class TestUncache(TestCase):
+
+    def test_cant_uncache_sys(self):
+        with self.assertRaises(ValueError):
+            with uncache('sys'): pass
+
+    def test_uncache_non_existent(self):
+        with uncache('mock.tests.support.bad'): pass