lib-core.camera-test

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

Version: 0.1.0
Lib-ID: lib-core.camera-test
Requires: lib-core.camera v>=0.3.0, lib-core.input v>=0.4.0
Tags: test, camera

Topology

graph LR
  this["lib-core.camera-test"]
  lib_core_camera["lib-core.camera"]
  this --> lib_core_camera
  lib_core_input["lib-core.input"]
  this --> lib_core_input
  engine["engine.*"]
  this --> engine

API

run_tests(ctx)

Syntax: M.run_tests(ctx) -> void

Description: Test-runner entrypoint. Executes 16 assertions against lib-core.camera. Called automatically by the engine's --test-libs= orchestrator. Exits via engine.exit(engine.test.failures()).

Coverage Statement

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

Section	Assertion-Count	Coverage
State setters/getters	3	set_target/target, set_zoom/zoom, set_pan_speed/pan_speed
Bounds-Clamping	3	set_bounds clamping, clear_bounds -> unclamped, immediate-clamp on bounds-shrink
pan_enabled state	6	Per-source disable (keys/edge/drag), bind_pan_keys auto-enable, toggle false/true
pan_invert state	2	set_pan_invert(false), set_pan_invert(true)
Engine-Surface existence	2	engine.input.get_mouse_delta, engine.window.size function presence
TOTAL	16

Tested-Surface

• camera.set_target / camera.target (value + bounds-clamping)
• camera.set_zoom / camera.zoom
• camera.set_pan_speed / camera.pan_speed
• camera.set_bounds, camera.clear_bounds
• camera.bind_pan_keys (auto-enable side-effect)
• camera.set_pan_enabled / camera.pan_enabled (toggle false/true)
• camera.set_pan_invert / camera.pan_invert
• Engine surface: engine.input.get_mouse_delta, engine.window.size

Fault-Injection Audit (2026-05-16)

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

#	Mutation	Caught by
M1	set_target: x/y assignments swapped	Assertions 1 (set_target -> target) + 4 (set_target clamped to bounds) fail
M2	clear_bounds made no-op	Assertion 5 (clear_bounds -> unclamped) fails
M3	bind_pan_keys auto-enable removed	Assertion 10 (bind_pan_keys auto-enables) fails

All 3 mutations caught — no gaps detected.

Structurally Untestable

• camera.begin / camera.finish — render-stack side-effects only observable inside a render hook; headless test-runner has no render context.
• camera.update(dt) interaction with per-frame mouse-input — requires live engine.input polling state.
• camera.screen_to_world — requires live window-size from engine.window.size, headless returns 0 (deferred).

Deferred

• enable_pan_edge, bind_pan_drag runtime behavior (covered indirectly via pan_enabled toggles).
• set_edge_threshold / edge_threshold getter/setter pair.

Running

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

Sporel.exe --libs-dir=<libs-path> --test-libs=lib-core.camera-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/camera/README.md
• Spec: meta/docs/superpowers/specs/2026-05-13-p3-5-camera-free-pan-design.md