# lib-core.input-test

Test-lib for `lib-core.input` (Tests-as-Libs per ADR-0037).

**Version:** 0.1.0  
**Lib-ID:** lib-core.input-test  
**Requires:** lib-core.input v>=0.4.0  
**Tags:** test, input

## Topology

<!-- topology:start (auto-generated; do not edit) -->
```mermaid
graph LR
  this["lib-core.input-test"]
  lib_core_input["lib-core.input"]
  this --> lib_core_input
  engine["engine.*"]
  this --> engine
```
<!-- topology:end -->

## Coverage Statement

Per Fault-Injection-Audit-Convention (2026-05-16):

| Section | Assertion-Count | Coverage |
|---|---|---|
| Engine surface presence | 7 | `MOUSE_LEFT/RIGHT/MIDDLE` constants, `is_mouse_down`, `was_mouse_pressed`, `was_released`, `was_mouse_released` |
| `bind` mouse-strings | 1 | `action_count == 1` after `bind("click", {"mouse_left"})` |
| `bind` mixed key+mouse | 1 | `action_count == 2` after mixed bind `{"e", "mouse_left"}` |
| `bind` rejects unknown mouse-name | 3 | Lua error raised, message mentions bad string, no partial state mutation |
| Headless query stubs | 4 | `is_action_down`, `was_action_pressed`, `was_action_released` return false; `was_action_released` for unknown returns false |
| Key-only regression | 1 | `bind("walk_left", {"a","left"})` still works after BIND_MAP refactor |
| **TOTAL** | **17** | |

### Tested-Surface
- `input.bind` (mouse-string acceptance, mixed key+mouse, unknown-name rejection, atomicity)
- `input.action_count`
- `input.is_action_down` (bound action headless = false)
- `input.was_action_pressed`
- `input.was_action_released` (bound action headless = false; unknown action = false)
- Engine surface: `MOUSE_LEFT/RIGHT/MIDDLE`, `is_mouse_down`, `was_mouse_pressed`, `was_released`, `was_mouse_released` function presence

### Fault-Injection Audit (2026-05-16)

Verified via deliberate-mutation in fixture-mirror; mutations reverted after observation.

#### Caught Mutations

| # | Mutation | Caught by |
|---|---|---|
| M1 | `function M.was_action_released` renamed (API-break) | Runtime error "attempt to call a nil value (field 'was_action_released')" — test aborts after assertion 14 |
| M2 | `if not entries then return false end` changed to `return nil` | `was_action_released for unknown action returns false` fails (`not ok`, got nil) |

#### Uncaught Mutations (Gaps)

| # | Mutation | Why uncaught | Severity |
|---|---|---|---|
| M3 | Dispatch-swap in `was_action_released` for-loop (key-kind ↔ mouse-kind) | Headless: all input queries return false regardless of swapped dispatch — no real events differentiate the paths | Med |

**Resolution:** Headless-unreachable. Requires real key/mouse events. Future-Slice B: integration test with simulated input events. No cheap headless fill possible.

### Structurally Untestable
- Real keyboard/mouse event delivery — headless mode never produces input events.
- `was_action_released` dispatch correctness for key-kind vs mouse-kind binding — see Gap M3.

### Deferred
- Integration test with simulated input events (Future-Slice B).

## Running

Via `--test-libs=lib-core.input-test` (Smoke P0-S-batch Stage):

```bash
Sporel.exe --libs-dir=<libs-path> --test-libs=lib-core.input-test
```

Output is TAP version 13 on stdout; exit-code = failure-count (0 = all pass).

## References

- ADR-0037 (Tests-as-Libs Convention)
- ADR-0038 (API-Doc-Convention)
- Production-Lib: `~/Projects/Sporel/sporel-libs/lib-core/input/README.md`
- Spec: `meta/docs/superpowers/specs/2026-05-12-p3-3-mouse-input-design.md`