Add test case for freeze.
diff --git a/Tools/freeze/test/ok.py b/Tools/freeze/test/ok.py
new file mode 100644
index 0000000..e15e0b4
--- /dev/null
+++ b/Tools/freeze/test/ok.py
@@ -0,0 +1,2 @@
+import sys
+sys.exit(0)