Fix leaked file handles in tests #41
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Replace bare open() calls with context managers to prevent resource leaks. Also simplify TESTS_DIR to Path(__file__).parent and remove unused os import. Closes #25
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Summary
open()calls with context managers (with open(...) as f:)to prevent resource leaks
str()wrapping aroundPathobjectsTESTS_DIRtoPath(__file__).parent, removing unusedosimportCloses #25