test: mock win32 in overlay runtime init test

src/core/services/overlay-runtime-init.test.ts

@@ -2,6 +2,23 @@ import assert from 'node:assert/strict';
 import test from 'node:test';
 import { initializeOverlayAnkiIntegration, initializeOverlayRuntime } from './overlay-runtime-init';
 
+function withPlatform(platform: NodeJS.Platform, run: () => void): void {
+  const originalPlatform = process.platform;
+  Object.defineProperty(process, 'platform', {
+    value: platform,
+    configurable: true,
+  });
+
+  try {
+    run();
+  } finally {
+    Object.defineProperty(process, 'platform', {
+      value: originalPlatform,
+      configurable: true,
+    });
+  }
+}
+
 test('initializeOverlayRuntime skips Anki integration when ankiConnect.enabled is false', () => {
   let createdIntegrations = 0;
   let startedIntegrations = 0;
@@ -548,6 +565,7 @@ test('initializeOverlayRuntime hides overlay windows when tracker loses the targ
 });
 
 test('initializeOverlayRuntime preserves visible overlay on Windows tracker loss when target is not minimized', () => {
+  withPlatform('win32', () => {
     const calls: string[] = [];
     const tracker = {
       onGeometryChange: null as ((...args: unknown[]) => void) | null,
@@ -602,6 +620,7 @@ test('initializeOverlayRuntime preserves visible overlay on Windows tracker loss
 
     assert.deepEqual(calls, ['sync-shortcuts']);
   });
+});
 
 test('initializeOverlayRuntime restores overlay bounds and visibility when tracker finds the target window again', () => {
   const bounds: Array<{ x: number; y: number; width: number; height: number }> = [];