Add test for ScanIso

[ryanohoro]

Describe the change

Adds a test for the ScanIso module.

Describe testing procedures

9/9 tests pass

$ cd src/python/strelka
$ python -m pytest tests/

=== test session starts ===
platform linux -- Python 3.10.7, pytest-7.2.0, pluggy-1.0.0
rootdir: strelka/src/python
plugins: mock-3.10.0
collected 9 items                                                                                                                                                                                   

tests/test_scan_footer.py .                                                                                                                                                                   [ 
tests/test_scan_gif.py .                                                                                                                                                                      [ 
tests/test_scan_iso.py .                                                                                                                                                                      [ 
tests/test_scan_msi.py .                                                                                                                                                                      [ 
tests/test_scan_url.py .....                                                                                                                                                                 

=== 9 passed in 0.42s ===

Containers built successfully. One new warning, inherited from existing tests.

$ cd build/
$ docker-compose build

strelka.tests.__pycache__.test_scan_gif.cpython-310: module references __file__
strelka.tests.__pycache__.test_scan_iso.cpython-310: module references __file__
strelka.tests.__pycache__.test_scan_msi.cpython-310: module references __file__

Successfully built eb41de1cb4d4
Successfully tagged build_frontend:latest

Sample output

No output changes.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of and tested my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (No new functionality)
• My changes generate no new warnings