# Handoff Report — Test Coverage Gap Analysis for `assembler.py`

## 1. Observation
We ran the unit tests for `assembler.py` and captured the code coverage report.
- **Command Executed**: `pytest tests/unit/tools/common/test_assembler.py -v`
- **Output (Coverage Section)**:
  ```
  reversecore_mcp/tools/common/assembler.py                 197     85    57%   69-70, 75-95, 122, 135, 139, 149, 153-163, 166-171, 174-179, 182, 206, 214, 219-222, 225-232, 235-240, 243-248, 251, 322-323, 331, 333, 336-338, 356-362
  ```
- **Files Inspected**:
  - `/Users/sjkim1127/Reversecore_MCP/reversecore_mcp/tools/common/assembler.py`
  - `/Users/sjkim1127/Reversecore_MCP/tests/unit/tools/common/test_assembler.py`

## 2. Logic Chain
1. The coverage report indicates that out of 197 statements in `reversecore_mcp/tools/common/assembler.py`, 85 are currently not executed, leaving the module at 57% coverage.
2. By reviewing the code of `assembler.py` alongside the uncovered line numbers (e.g., `69-70`, `75-95`, etc.), we mapped the gaps to four root causes:
   - **Import Fallbacks**: Capstone and Keystone fallback blocks when the libraries are missing/uninstalled, or have different API versions/renames (e.g. lines 69-70, 75-95).
   - **Unsupported architectures/modes**: Many combinations of architecture and mode clean-ups are never passed to the parameter mapping functions `get_keystone_params` and `get_capstone_params`.
   - **Compilation exception handling**: Specific error states (such as `KsError` on initialization, `encoding is None`, or generic `Exception`) are never triggered by the mocked `Ks` engine in the tests.
   - **Disassembly verification warnings**: Specific Capstone verification warnings (no instructions, disassembly error, unsupported verify arch, Capstone not available) are never triggered by the existing mocks.
3. Therefore, achieving 100% test coverage requires a testing strategy that explicitly targets each of these four gaps through:
   - Dynamic module reloads to trigger import fallbacks.
   - Parametrized tests covering all architecture/mode combinations.
   - Injecting error-throwing mock classes for `Ks` and `Cs`.

## 3. Caveats
- **Assumption on Environment**: We assumed that `importlib.reload` works reliably in the test environment. Python reload behaves nicely when modifying globals, but since other modules might have imported the old module, we make sure to reload the module again at the end of each reload test to restore the default/original imported module state.
- **Capstone Versioning**: The code references Capstone 6 rename changes (`CS_ARCH_ARM64` vs `CS_ARCH_AARCH64`). We mocked these attributes assuming Python's import system behavior.

## 4. Conclusion
The assembler tool has coverage gaps (at 57% line coverage) which are fully documented in `analysis.md` along with a precise strategy and the exact unit test code (12 new test cases/matrices) that need to be appended to `tests/unit/tools/common/test_assembler.py` to reach 100% coverage.

## 5. Verification Method
- **Verify Analysis**: Inspect `analysis.md` located in the agent's folder (`/Users/sjkim1127/Reversecore_MCP/.agents/explorer_m7_1_1/analysis.md`) to read the complete breakdown.
- **Verify Coverage (after implementation)**: After appending the recommended tests to `tests/unit/tools/common/test_assembler.py`, execute:
  ```bash
  pytest tests/unit/tools/common/test_assembler.py -v
  ```
  Ensure all tests pass and coverage of `assembler.py` is 100%.
