test: add test for get_private_keys

[athith-g]

Adds tests for get_private_keys in decrypt.py.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds a new test file test_decrypt.py under tests/decryption/ to provide unit tests for the get_private_keys function in decrypt.py. The tests cover scenarios with empty input lists and various combinations of public and private key files, ensuring that only private keys are retrieved.

File-Level Changes

Files	Changes
tests/decryption/test_decrypt.py	Added comprehensive tests for the get_private_keys function in decrypt.py, including tests for empty input and various file combinations.

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[sourcery-ai]

Hey @athith-g - I've reviewed your changes and found some issues that need to be addressed.

Blocking issues:

• Hard-coded private key found. (link)
• Hard-coded private key found. (link)
• Hard-coded private key found. (link)

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🔴 Security: 3 blocking issues
• 🟡 Testing: 3 issues found
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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