test: add decrypt files tests

[athith-g]

Adds tests for decrypt_files.

Summary by Sourcery

This pull request introduces new tests for the decrypt_files function, ensuring its correct behavior with both encrypted and unencrypted files. The tests include setup for key pairs and file encryption, enhancing the test coverage for the decryption functionality.

• Tests:
  • Added comprehensive tests for the decrypt_files function, including fixtures for key pairs, encrypted files, and unencrypted files.
  • Ensured that decrypt_files correctly decrypts encrypted files in-place and does not throw exceptions for unencrypted files.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds tests for the decrypt_files function in the crypt4gh_middleware module. The changes include the addition of a new test class TestDecryptFiles with several fixtures and a parameterized test method to ensure the correct functionality of the decrypt_files function. Additionally, minor modifications were made to the existing TestGetPrivateKeys class to correct the key retrieval method.

File-Level Changes

Files	Changes
tests/decryption/test_decrypt.py	Introduced a new test class TestDecryptFiles with necessary fixtures and a parameterized test method to validate the decrypt_files function. Also, corrected the key retrieval method in the existing TestGetPrivateKeys class.

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[sourcery-ai]

Hey @athith-g - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟡 Testing: 5 issues found
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[jvkersch]

Looks good to me, one question about the fixtures and 1-2 small nits.