Create comprehensive test suite for future-proof functionality

- [x] 4. Create comprehensive test suite for future-proof functionality
  - [x] 4.1 Add unit tests for bounds checking behavior
    - Test that get_key() returns 0 for out-of-bounds indices
    - Test that get_key_checked() returns None for invalid indices
    - Verify key_count() returns correct values for different storage variants
    - _Requirements: 3.2_

  - [x] 4.2 Add integration tests for third-party compatibility
    - Create mock third-party const definitions using new format
    - Test that existing key access patterns continue to work
    - Verify backwards compatibility throughout migration phases
    - _Requirements: 1.1, 2.3_

  - [x] 4.3 Add performance regression tests
    - Benchmark CRC calculation performance before and after changes
    - Verify that key access performance matches direct array access
    - Test memory usage impact of enum-based storage
    - _Requirements: 2.2, 4.4_

  - [x] 4.4 Add future expansion simulation tests
    - Create test CrcParams using KeysFutureTest variant with 25 keys
    - Test that code gracefully handles different key array sizes
    - Verify that expansion to larger key arrays works as designed
    - _Requirements: 1.1, 4.2_

Author: onethumb

.kiro/specs/future-proof-crc-params/tasks.md

@@ -62,26 +62,26 @@
     - Ensure cache functionality remains intact after structural changes
     - _Requirements: 2.3, 5.3_
 
-- [ ] 4. Create comprehensive test suite for future-proof functionality
-  - [ ] 4.1 Add unit tests for bounds checking behavior
+- [x] 4. Create comprehensive test suite for future-proof functionality
+  - [x] 4.1 Add unit tests for bounds checking behavior
     - Test that get_key() returns 0 for out-of-bounds indices
     - Test that get_key_checked() returns None for invalid indices
     - Verify key_count() returns correct values for different storage variants
     - _Requirements: 3.2_
 
-  - [ ] 4.2 Add integration tests for third-party compatibility
+  - [x] 4.2 Add integration tests for third-party compatibility
     - Create mock third-party const definitions using new format
     - Test that existing key access patterns continue to work
     - Verify backwards compatibility throughout migration phases
     - _Requirements: 1.1, 2.3_
 
-  - [ ] 4.3 Add performance regression tests
+  - [x] 4.3 Add performance regression tests
     - Benchmark CRC calculation performance before and after changes
     - Verify that key access performance matches direct array access
     - Test memory usage impact of enum-based storage
     - _Requirements: 2.2, 4.4_
 
-  - [ ] 4.4 Add future expansion simulation tests
+  - [x] 4.4 Add future expansion simulation tests
     - Create test CrcParams using KeysFutureTest variant with 25 keys
     - Test that code gracefully handles different key array sizes
     - Verify that expansion to larger key arrays works as designed