diff --git a/tests/wiring.test.mjs b/tests/wiring.test.mjs
new file mode 100644
index 0000000..61d3568
--- /dev/null
+++ b/tests/wiring.test.mjs
@@ -0,0 +1,49 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { readFile } from 'node:fs/promises';
+
+const read = (path) => readFile(new URL(`../${path}`, import.meta.url), 'utf8');
+
+test('mobile HUD uses split helm frame and knob assets', async () => {
+  const source = await read('src/mobile-hud.js');
+
+  assert.match(source, /import helmFrameSrc from '.\/assets\/controller\/helm-frame\.js'/);
+  assert.match(source, /import helmKnobSrc from '.\/assets\/controller\/helm-knob\.js'/);
+  assert.doesNotMatch(source, /helmSpriteSheetSrc/);
+  assert.doesNotMatch(source, /helm-sheet\.webp/);
+  assert.doesNotMatch(source, /backgroundPosition = .*column/);
+});
+
+test('drag control emits and HUD consumes one shared helm vector event', async () => {
+  const [index, hud] = await Promise.all([
+    read('index.html'),
+    read('src/mobile-hud.js'),
+  ]);
+
+  assert.match(index, /CustomEvent\('airship:helm-vector'/);
+  assert.match(index, /emitHelmVector\(dx \/ radius, dy \/ radius\)/);
+  assert.match(index, /emitHelmVector\(0, 0\)/);
+
+  assert.match(hud, /addEventListener\('airship:helm-vector'/);
+  assert.match(hud, /setHelmKnob\(event\.detail\?\.x \?\? 0, event\.detail\?\.y \?\? 0\)/);
+});
+
+test('top HUD and cannon controls use direct image modules', async () => {
+  const source = await read('src/mobile-hud.js');
+
+  assert.match(source, /import topHudSrc from '.\/assets\/controller\/top-hud\.js'/);
+  assert.match(source, /import cannonRoundelSrc from '.\/assets\/controller\/cannon-roundel\.js'/);
+  assert.match(source, /addPiece\('steam-top', topHudSrc/);
+  assert.match(source, /addPiece\('steam-cannon-port', cannonRoundelSrc/);
+  assert.match(source, /addPiece\('steam-cannon-starboard', cannonRoundelSrc/);
+});
+
+test('player collision callback queues hits and processing occurs in scene update', async () => {
+  const source = await read('src/game-v4.js');
+
+  assert.match(source, /this\.pendingPlayerHits\.push\(\{ shot, damage \}\)/);
+  assert.match(source, /this\.processPlayerHits\(\)/);
+  assert.match(source, /reducePlayerHitQueue\(\{/);
+  assert.match(source, /combat:player-hit-queued/);
+  assert.match(source, /combat:player-hit-processed/);
+});