pdftract/notes/bf-2np8r.md

bf-2np8r: Add common test fixtures and helpers for encryption tests

Summary

Successfully implemented common test fixtures and helper functions for encryption testing in the pdftract workspace.

Implementation

Files Created

1. tests/encryption_fixtures.rs (461 lines)

   • Comprehensive module providing shared utilities for encryption tests
   • Path resolution functions: workspace_root(), pdftract_bin(), encrypted_fixture(), fixture()
   • Test execution helpers: run_pdftract_extract(), run_pdftract_extract_with_stdin_password()
   • Assertion helpers: assert_encryption_diagnostic(), assert_encryption_exit_code(), assert_success_exit_code(), assert_failure_exit_code(), assert_output_contains()
   • Fixture validation: assert_fixture_exists(), assert_valid_pdf_structure(), assert_encrypted_fixtures_exist()
   • Mock data builders (with decrypt feature): make_dict(), make_trailer(), make_rc4_encryption_dict(), make_aes128_encryption_dict(), make_aes256_encryption_dict(), make_unsupported_encryption_dict()
   • Test constants: EXPECTED_ENCRYPTION_EXIT_CODE, ENCRYPTED_FIXTURES, TEST_PASSWORD, WRONG_PASSWORD
   • Includes module tests verifying all functionality

2. tests/lib.rs (7 lines)

   • Test support library for pdftract integration tests
   • Exports encryption_fixtures module for use across workspace

3. tests/mod.rs (7 lines)

   • Test module aggregation
   • Includes encryption_fixtures as public module

4. tests/ENCRYPTION_FIXTURES.md (161 lines)

   • Comprehensive documentation for the fixtures module
   • Usage examples and API reference
   • Maintenance guidelines

5. tests/verify_encryption_fixtures.rs (137 lines)

   • Verification tests for the fixtures module
   • Tests all helper functions and mock builders
   • Validates fixture path resolution

6. tests/encryption_fixtures_usage_example.rs (81 lines)

   • Example usage demonstrating fixture module
   • Reference implementation for other test files

Acceptance Criteria Status

• ✅ Common test fixtures added: Created comprehensive fixture list with 5 encrypted PDFs
• ✅ Helper functions added: 20+ helper functions for path resolution, test execution, assertions, and fixture validation
• ✅ Code compiles successfully: Verified with cargo check --tests - no compilation errors
• ✅ Functions are usable across multiple encryption tests: Module is publicly exported and can be imported with use pdftract_tests::encryption_fixtures::*

Test Coverage

Verification Tests Created

1. Path resolution tests (5 tests)
2. Constant validation tests (4 tests)
3. Mock builder tests (4 tests, feature-gated on decrypt)
4. Fixture validation tests (3 tests)
5. Integration tests demonstrating usage

Encrypted Fixtures Available

• livecycle.pdf - Adobe LiveCycle unsupported encryption
• EC-04-rc4-encrypted.pdf - RC4-40 encryption (V=1, R=2)
• EC-05-aes128-encrypted.pdf - AES-128 encryption (V=4, R=4)
• EC-06-aes256-encrypted.pdf - AES-256 encryption (V=5, R=6)
• EC-empty-password.pdf - Empty password PDF

Integration Notes

The existing encryption test at crates/pdftract-cli/tests/test_encryption_errors.rs currently duplicates some of this functionality with its own implementations of:

• workspace_root()
• encrypted_fixture_dir()
• encrypted_fixture()
• pdftract_bin()
• ENCRYPTION_EXIT_CODE constant
• ENCRYPTED_FIXTURES constant

Future work could refactor that file to use the common fixtures from pdftract_tests::encryption_fixtures instead, eliminating duplication.

References

• Parent bead: bf-2nl4x
• Plan line 258, Failure Mode Taxonomy: ENCRYPTION_UNSUPPORTED
• Related files:
  • tests/encryption_fixtures.rs
  • tests/lib.rs
  • tests/ENCRYPTION_FIXTURES.md
  • tests/verify_encryption_fixtures.rs
  • tests/encryption_fixtures_usage_example.rs

Git Status

Files are currently untracked (newly created):

• tests/encryption_fixtures.rs
• tests/lib.rs
• tests/ENCRYPTION_FIXTURES.md
• tests/verify_encryption_fixtures.rs
• tests/encryption_fixtures_usage_example.rs
• tests/mod.rs (modified)

All files compile successfully and are ready for commit.