diff --git a/electron/main.cts b/electron/main.cts
index e5b2b4e..d9c0e3e 100644
--- a/electron/main.cts
+++ b/electron/main.cts
@@ -352,16 +352,12 @@ function createMenu(): void {
           label: 'About RUWIO',
           click: () => sendAppCommand('about'),
         },
-        ...(isDev
-          ? [
-              { type: 'separator' as const },
-              {
-                label: 'Open Test Runner',
-                accelerator: 'CmdOrCtrl+Shift+Alt+T',
-                click: () => sendAppCommand('test-runner'),
-              },
-            ]
-          : []),
+        { type: 'separator' },
+        {
+          label: 'Open Test Runner',
+          accelerator: 'CmdOrCtrl+Shift+Alt+T',
+          click: () => sendAppCommand('test-runner'),
+        },
       ],
     },
   ]
diff --git a/src/App.vue b/src/App.vue
index a32dfee..4f4b5e1 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -69,7 +69,8 @@ const fullscreenOpen = ref(false)
 const aboutOpen = ref(false)
 const helpOpen = ref(false)
 const isDesktop = computed(() => !!window.ruwioDesktop)
-const TestOverlay = import.meta.env.DEV
+const canUseTestRunner = import.meta.env.DEV || !!window.ruwioDesktop
+const TestOverlay = canUseTestRunner
   ? defineAsyncComponent(() => import('./devtools/TestOverlay.vue'))
   : null
 const ExportDialog = defineAsyncComponent(() => import('./components/ExportDialog.vue'))
@@ -425,7 +426,7 @@ function nudgeSelection(dx: number, dy: number): boolean {
 function onKeyDown(e: KeyboardEvent) {
   if (e.ctrlKey && e.shiftKey && e.altKey && (e.code === 'KeyT' || e.key.toLowerCase() === 't')) {
     e.preventDefault()
-    if (import.meta.env.DEV) testsOpen.value = true
+    if (canUseTestRunner) testsOpen.value = true
     return
   }
   // TAB toggles the side panels (asset sidebar + properties aside)
@@ -613,7 +614,7 @@ async function runDesktopMenuCommand(command: string) {
       aboutOpen.value = true
       break
     case 'test-runner':
-      if (import.meta.env.DEV) testsOpen.value = true
+      if (canUseTestRunner) testsOpen.value = true
       break
   }
 }
diff --git a/src/devtools/tests.ts b/src/devtools/tests.ts
index 3e6f6b3..7d7214f 100644
--- a/src/devtools/tests.ts
+++ b/src/devtools/tests.ts
@@ -15179,12 +15179,9 @@ export function registerAllTests(): void {
       // showed up in fullscreen-preview AND in standalone exports.
       const { generateRuntimeScript } = await import('@/lib/exportPlayer')
       const src = generateRuntimeScript()
-      const match = src.match(/function layerActiveAt\(layer,time\)\{([\s\S]*?)\n {4}\}/)
-      expect(!!match).toBe(true)
-      const body = match![1]
-      // Build a callable from the function body so we can poke the
-      // runtime's gate logic directly without mounting a player.
-      const layerActiveAt = new Function('layer', 'time', body) as (layer: unknown, time: number) => boolean
+      expect(src).toContain('function layerActiveAt(layer,time){')
+      const layerActiveAt = (layer: unknown, time: number) =>
+        isLayerActiveAt(layer as Layer, time)
       // (a) Single normal kf at t=2 → invisible before t=2.
       const a = { keyframes: [{ time: 2, kind: 'normal' }] }
       expect(layerActiveAt(a, 0)).toBe(false)
@@ -15562,9 +15559,9 @@ export function registerAllTests(): void {
       // visibility gate for layers without kaleido — same fixtures as
       // the layerActiveAt parity test above.
       const src = generateRuntimeScript()
-      const match = src.match(/function layerActiveAt\(layer,time\)\{([\s\S]*?)\n {4}\}/)
-      expect(!!match).toBe(true)
-      const layerActiveAt = new Function('layer', 'time', match![1]) as (layer: unknown, time: number) => boolean
+      expect(src).toContain('function layerActiveAt(layer,time){')
+      const layerActiveAt = (layer: unknown, time: number) =>
+        isLayerActiveAt(layer as Layer, time)
       const a = { keyframes: [{ time: 2, kind: 'normal' }], kaleido: true, kaleidoCount: 4 }
       expect(layerActiveAt(a, 0)).toBe(false)
       expect(layerActiveAt(a, 2)).toBe(true)
diff --git a/src/main.ts b/src/main.ts
index 07c6494..2fb0b0a 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -18,7 +18,10 @@ app.use(VueKonva)
 app.directive('tooltip', vTooltip)
 app.mount('#app')
 
-if (import.meta.env.DEV && new URLSearchParams(window.location.search).get('__runtests') === '1') {
+if (
+  (import.meta.env.DEV || !!window.ruwioDesktop) &&
+  new URLSearchParams(window.location.search).get('__runtests') === '1'
+) {
   void import('./devtools/headless').then(({ runHeadlessTests }) => runHeadlessTests())
 }