[Python-Dev] incorrect regression tests

Neal Norwitz neal@metaslash.com
Mon, 17 Feb 2003 10:02:15 -0500

I found 7 regression tests which weren't being executed by regrtest.
I checked in fixes for 6 of them.  test_zipimport was the other test,
but there was a problem.  More on that below.

To be run, tests must do one of following:

        1) have a def test_main() which runs the tests
        2) run the tests as a side-effect of import

I'm wondering if regrtest.py should grow an option to print a list of
all the tests which don't define test_main?  When adding a new test,
it will be easy to verify the test is, in fact, being run.  Perhaps
also a list of known tests which don't have a test_main and are
expected to run on import? (I think there's over 100.)

When test_zipimport is run by regrtest, there is memory corruption:

[neal@epoch 2.3]$ ./python -E -tt ./Lib/test/regrtest.py test_zipimport
Debug memory block at address p=0x40280508:
    74 bytes originally requested
    The 4 pad bytes at p-4 are FORBIDDENBYTE, as expected.
    The 4 pad bytes at tail=0x40280552 are not all FORBIDDENBYTE (0xfb):
        at tail+0: 0x00 *** OUCH
        at tail+1: 0xfb
        at tail+2: 0xfb
        at tail+3: 0xfb
    The block was made by call #51959 to debug malloc/realloc.
    Data at p: 64 65 66 20 67 65 74 5f ... 69 6c 65 5f 5f 0a 00 0a
Fatal Python error: bad trailing pad byte
Aborted (core dumped)

I didn't check in the test or investigate the cause.
Below is a patch to the test so it will run under regrtest.

Index: test_zipimport.py
RCS file: /cvsroot/python/python/dist/src/Lib/test/test_zipimport.py,v
retrieving revision 1.5
diff -w -u -r1.5 test_zipimport.py
--- test_zipimport.py   9 Jan 2003 22:27:10 -0000       1.5
+++ test_zipimport.py   17 Feb 2003 14:58:45 -0000
@@ -186,6 +186,9 @@
     compression = ZIP_DEFLATED
-if __name__ == "__main__":
+def test_main():
+if __name__ == "__main__":
+    test_main()