# Iteration 3 — Test Implementation Notes

## Plan file addressed

`docs/testing/plans/03-sessions.md`

## Tests created

### src/config/session.rs (15 new tests)

| Test name | What it verifies |
|---|---|
| `session_default_is_empty` | Default session is empty, no name, no role, not dirty |
| `session_new_from_ctx_captures_save_session` | new_from_ctx captures name, empty, not dirty |
| `session_set_role_captures_role_info` | set_role copies model_id, temperature, role_name, marks dirty |
| `session_clear_role` | clear_role removes role_name |
| `session_guard_empty_passes_when_empty` | guard_empty OK when empty |
| `session_needs_compression_threshold` | Empty session doesn't need compression |
| `session_needs_compression_returns_false_when_compressing` | Already compressing → false |
| `session_needs_compression_returns_false_when_threshold_zero` | Zero threshold → false |
| `session_set_compressing_flag` | set_compressing toggles flag |
| `session_set_save_session_this_time` | Doesn't panic |
| `session_save_session_returns_configured_value` | save_session get/set roundtrip |
| `session_compress_moves_messages` | compress moves messages to compressed, adds system |
| `session_is_not_empty_after_compress` | Session with compressed messages is not empty |
| `session_need_autoname_default_false` | Default session doesn't need autoname |
| `session_set_autonaming_doesnt_panic` | set_autonaming safe without autoname |

### src/config/request_context.rs (4 new tests, 11 total)

| Test name | What it verifies |
|---|---|
| `exit_session_clears_session` | exit_session removes session from ctx |
| `empty_session_clears_messages` | empty_session keeps session but clears it |
| `maybe_compress_session_returns_false_when_no_session` | No session → no compression |
| `maybe_autoname_session_returns_false_when_no_session` | No session → no autoname |

**Total: 19 new tests (86 → 105)**

## Bugs discovered

None. Session behavior matches between old and new code.

## Observations for future iterations

1. `Session::new_from_ctx` and `Session::load_from_ctx` have
   `#[allow(dead_code)]` annotations — they were bridge methods.
   Should verify if they're still needed or if the old `Session::new`
   and `Session::load` (which take `&Config`) should be cleaned up
   in a future pass.

2. The `compress` method moves messages to `compressed_messages` and
   adds a single system message with the summary. This is a critical
   behavioral contract — if the summary format changes, sessions
   could break.

3. `needs_compression` uses `self.compression_threshold` (session-
   level) with fallback to the global threshold. This priority
   (session > global) is important behavior.

4. Session carry-over (the "incorporate last Q&A?" prompt) happens
   inside `use_session` which is async and involves user interaction
   (inquire::Confirm). Can't unit test this — needs integration test
   or manual verification.

5. The `extract_role` test for session-active case should verify that
   `session.to_role()` is returned. Added note to plan 02.

## Plan file updates

Updated 03-sessions.md to mark completed items.

## Next iteration

Plan file 04: Agents — agent init, tool compilation, variables,
lifecycle, MCP, RAG, auto-continuation.
