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fix: Add (more) unit tests #542

Job	Run time
Read C2PA version	4s
Unit tests for developer setup (Unix) (macos-latest)	48s
Unit tests for developer setup (Unix) (ubuntu-latest)	25s
Unit tests for developer setup (Windows)	53s
Build Linux wheel (x86_64, ubuntu-24.04) / build	1m 1s
Build macOS wheel (aarch64) / build	14s
sdist	17s
Build Windows wheel (x64) / build	53s
Test macOS built wheel (aarch64)	52s
Test Windows built wheel (x64)	56s
Test Linux built wheel (x86_64, ubuntu-24.04)	30s
Release	-1s
	6m 52s

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