Enchantrix/AUDIT-TESTING.md

Test Audit Report

This report provides a comprehensive analysis of the test coverage, quality, and practices within the Enchantrix project.

1. Coverage Analysis

The overall test coverage for the project is 76.0%. While the core pkg libraries are well-tested (most above 90%), the cmd and examples packages have significant gaps, bringing down the total average.

Line Coverage

• Total Coverage: 76.0%
• cmd/trix: ~80%
• pkg/crypt: ~95%
• pkg/enchantrix: ~97%
• pkg/trix: ~97%
• examples/*: 0%

Branch Coverage

Branch coverage was not explicitly measured, but the line coverage analysis revealed several untested branches in the codebase. These are detailed in the "Untested Code" section below.

Untested Code

The following files and functions have low or zero test coverage:

• cmd/trix/main.go:
  • handleSigil: Error handling for ioutil.ReadFile is not tested.
  • handleHash: Error handling for ioutil.ReadFile is not tested.
  • handleEncode: Error handling for ioutil.ReadFile and ioutil.WriteFile is not tested.
  • handleDecode: Error handling for ioutil.ReadFile and ioutil.WriteFile is not tested.
• pkg/crypt/crypt.go:
  • ensurePGP: The branch where s.pgp is not nil is not tested.
• pkg/crypt/std/rsa/rsa.go:
  • GenerateKeyPair: The error path for x509.MarshalPKIXPublicKey is not tested.
• pkg/enchantrix/crypto_sigil.go:
  • NewChaChaPolySigilWithObfuscator: The error path is not tested.
  • In: The error path for chacha20poly1305.NewX is not tested.
  • Out: The error path for chacha20poly1305.NewX is not tested.
• pkg/enchantrix/sigils.go:
  • HexSigil.Out: The error path for hex.Decode is not tested.
  • Base64Sigil.Out: The error path for base64.StdEncoding.Decode is not tested.
• pkg/trix/crypto.go:
  • EncryptPayload: The error paths for enchantrix.NewChaChaPolySigilWithObfuscator and sigil.In are not tested.
  • DecryptPayload: The error path for enchantrix.NewChaChaPolySigilWithObfuscator is not tested.
• pkg/trix/trix.go:
  • Unpack: The branch where OutSigils is empty and it falls back to InSigils is not tested.
• All main.go files in examples/ subdirectories have 0% coverage.

2. Test Quality

The overall quality of the tests is high. The project consistently uses the testify library for assertions and follows a clear Good, Bad, Ugly structure for tests.

Test Independence

• Tests are mostly isolated. However, some tests in cmd/trix/main_test.go and pkg/crypt/crypt_test.go use global variables, which is an anti-pattern that can lead to test interdependencies.

Test Clarity

• Descriptive Names: Most test names are clear and descriptive. Some could be improved, for example, TestMain_Good in cmd/trix/main_test.go could be renamed to TestMain_NoArgs_PrintsHelp to be more specific.
• Arrange-Act-Assert: The Arrange-Act-Assert pattern is generally followed, but could be more consistently applied.

Test Reliability

• Flaky Tests: No flaky tests were observed during the audit.
• External Dependencies: External dependencies are well-mocked, particularly in pkg/crypt/std/rsa/rsa_test.go and pkg/enchantrix/crypto_sigil_test.go.

3. Missing Tests

• Edge Cases: The tests cover a good range of edge cases, but some are missing, such as the fallback logic in pkg/trix/trix.go:Unpack.
• Error Paths: The primary gap in testing is the lack of coverage for I/O error paths in cmd/trix/main.go and other error paths as detailed in the "Untested Code" section.
• Integration Tests: The TestEncryptedTrixRoundTrip test in pkg/trix/crypto_test.go is a good example of an integration test. More integration tests could be added to cover the interaction between the trix CLI and the pkg libraries.
• Performance Tests: There are no performance tests (e.g., load, stress) in the project. While not critical for a library of this nature, benchmark tests for the cryptographic functions could be beneficial.

4. Anti-Patterns

• Shared State: The use of global variables for the service in pkg/crypt/crypt_test.go and for rootCmd, exit, etc. in cmd/trix/main_test.go is an anti-pattern. This can lead to test interdependencies and flaky tests.

5. Suggested Tests to Add

Based on this audit, the following tests should be added to improve coverage and quality:

1. cmd/trix/main_test.go:
   • Add tests for handleSigil, handleHash, handleEncode, and handleDecode that simulate file I/O errors.
2. pkg/crypt/crypt_internal_test.go:
   • Add a test case to cover the s.pgp != nil branch of ensurePGP.
3. pkg/crypt/std/rsa/rsa_internal_test.go:
   • Add a test case to cover the error path for x509.MarshalPKIXPublicKey in GenerateKeyPair.
4. pkg/enchantrix/crypto_sigil_internal_test.go:
   • Add a test case to cover the error path in NewChaChaPolySigilWithObfuscator.
   • Add test cases to cover the error path for chacha20poly1305.NewX in In and Out.
5. pkg/enchantrix/sigils_internal_test.go:
   • Add a test case for HexSigil.Out with invalid hex data.
   • Add a test case for Base64Sigil.Out with invalid base64 data.
6. pkg/trix/crypto_internal_test.go:
   • Add test cases to cover the error paths in EncryptPayload and DecryptPayload.
7. pkg/trix/trix_internal_test.go:
   • Add a test case for Unpack where OutSigils is empty.
8. examples/examples_test.go:
   • Add tests for the main functions in the examples subdirectories.