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fix: Add (more) unit tests #541

Job	Run time
Read C2PA version	6s
Unit tests for developer setup (Windows)	1m 16s
Unit tests for developer setup (Unix) (ubuntu-latest)	26s
Unit tests for developer setup (Unix) (macos-latest)	40s
Build Linux wheel (x86_64, ubuntu-24.04) / build	1m 2s
Build macOS wheel (aarch64) / build	17s
Test macOS built wheel (aarch64)	52s
sdist	21s
Build Windows wheel (x64) / build	48s
Test Linux built wheel (x86_64, ubuntu-24.04)	30s
Test Windows built wheel (x64)	46s
Release	0s
	7m 4s

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