test(command-test): cheap-fill M3 gap + Coverage Statements (Test-Cov Phase 2.6)

3 mutations tested. 2 caught, 1 uncaught (M3: cancel_all with 2+ simultaneous commands).
Cheap-fill: added 2-unit simultaneous cancel_all scenario with both-nil assertions.

README.md

@@ -0,0 +1,48 @@
+# sporel-module-lib-core.command-test
+
+P.3.7 reference test-module — validates `lib-core.command` API contracts
+via the `engine.test.*` assertion surface.
+
+- Module-ID: `lib-core.command-test`
+- Version: `0.1.0`
+- Kind: `test-module` (headless; runs init() once + exits)
+- Spec: `meta/docs/superpowers/specs/2026-05-14-p3-7-lib-command-design.md`
+
+## Run
+
+```bash
+Sporel.exe --test-libs=lib-core.command-test
+```
+
+Output is TAP version 13 on stdout; exit-code = failure-count (0 = all pass).
+
+## Coverage Statements (2026-05-16 Fault-Injection Audit)
+
+Verified via deliberate-mutation in fixture-mirror; mutations reverted after observation.
+
+### Caught Mutations
+
+| # | Mutation | Caught by |
+|---|---|---|
+| M1 | `M.move_to` prefixed with `do return end` (complete no-op) | 6 assertions fail: "current returns move-command data" (ok 4), "is_moving true after move_to" (ok 5), "update moves 10px" (ok 9), "arrival snap to target.x" (ok 11), "cancel doesn't affect h3" (ok 14), "move_to with unknown handle errors" (ok 23) |
+| M2 | `M.is_moving` prefixed with `do return false end` (always false) | Assertion "is_moving true after move_to" (ok 5) |
+
+### Uncaught Mutations (Gaps)
+
+| # | Mutation | Why uncaught | Severity |
+|---|---|---|---|
+| M3 | `M.cancel_all` rewritten to loop-and-break after first entry (only cancels one command) | Existing test cancels h2 manually before calling `cancel_all`, leaving only h3 active — single-entry cancel_all succeeds trivially | Medium |
+
+**Resolution per Gap:**
+- Gap M3: Cheap-fill applied — added a second `cancel_all` scenario where both h2 and h3 are active simultaneously; asserts both are nil after `cancel_all` (commit see below).
+
+### Cheap-Gap-Fills Applied
+
+| Gap | New Assertion | Re-Inject Verifies |
+|---|---|---|
+| M3 | `cancel_all clears h2 of 2-unit batch` — `current(h2) == nil` after issuing move to both then cancel_all | ✓ |
+| M3 | `cancel_all clears h3 of 2-unit batch` — `current(h3) == nil` after same cancel_all | ✓ |
+
+### Tested Production-Lib Surface
+
+`lib-core.command` v0.1.0 — Tests cover: `register`, `unregister`, `count_registered`, `move_to`, `current`, `is_moving`, `cancel`, `cancel_all`, `speed`, `set_speed`, `arrive_threshold`, `set_arrive_threshold`, `enabled`, `set_enabled`, `update` (step + arrival-snap).

init.lua

@@ -56,7 +56,7 @@ function M.run_tests(ctx)
     T.equals(s2.x, 5, "arrival snap to target.x")
     T.assert(command.current(h2) == nil, "arrival clears active command")
 
-    -- Cancel + cancel_all (3)
+    -- Cancel + cancel_all (5)
     s2.x, s2.y = 0, 0
     command.move_to({h2, h3}, 1000, 0)
     command.cancel(h2)
@@ -64,6 +64,10 @@ function M.run_tests(ctx)
     T.assert(command.current(h3) ~= nil, "cancel doesn't affect h3")
     command.cancel_all()
     T.assert(command.current(h3) == nil, "cancel_all clears remaining")
+    command.move_to({h2, h3}, 500, 0)
+    command.cancel_all()
+    T.assert(command.current(h2) == nil, "cancel_all clears h2 of 2-unit batch")
+    T.assert(command.current(h3) == nil, "cancel_all clears h3 of 2-unit batch")
 
     -- Speed-Setter (2)
     T.equals(command.speed(h2), 100, "speed from register")