Archipelago — open-source initial import

neode-ui/src/utils/__tests__/openExternal.test.ts

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+import { describe, it, expect, afterEach } from 'vitest'
+import { isCompanionApp } from '../openExternal'
+
+// isCompanionApp() is the single companion-detection source used to skip the
+// demo intro (App.vue + RootRedirect.vue) and by appLauncher — it must be true
+// iff the native shell injected window.ArchipelagoNative with openInApp.
+
+type TestWindow = Window & { ArchipelagoNative?: unknown }
+const w = window as TestWindow
+
+afterEach(() => {
+  delete w.ArchipelagoNative
+})
+
+describe('isCompanionApp', () => {
+  it('is false in a plain browser/PWA (no bridge injected)', () => {
+    expect(isCompanionApp()).toBe(false)
+  })
+
+  it('is true when the native shell injected the bridge with openInApp', () => {
+    w.ArchipelagoNative = { openInApp: () => {} }
+    expect(isCompanionApp()).toBe(true)
+  })
+
+  it('is false when the bridge exists but lacks a callable openInApp', () => {
+    w.ArchipelagoNative = { openExternal: () => {} }
+    expect(isCompanionApp()).toBe(false)
+  })
+})