Now produces some reassuring output.
diff --git a/Lib/test/output/test_zlib b/Lib/test/output/test_zlib
index 12e10aa..1961228 100644
--- a/Lib/test/output/test_zlib
+++ b/Lib/test/output/test_zlib
@@ -1 +1,10 @@
test_zlib
+-440295136 1136044692
+198574839 198574839
+expecting Bad compression level
+expecting Invalid initialization option
+expecting Invalid initialization option
+normal compression/decompression succeeded
+compress/decompression obj succeeded
+decompress with init options succeeded
+decompressobj with init options succeeded