diff --git a/components/popout/__tests__/popout-host.test.tsx b/components/popout/__tests__/popout-host.test.tsx
index a7629b043..4defd25c8 100644
--- a/components/popout/__tests__/popout-host.test.tsx
+++ b/components/popout/__tests__/popout-host.test.tsx
@@ -55,7 +55,7 @@ beforeEach(() => {
   FakeBroadcastChannel.reset();
   vi.stubGlobal('BroadcastChannel', FakeBroadcastChannel);
   // The bridge makes pop-outs available without stubbing the display mode.
-  window.bulwarkDesktop = { windows: {} };
+  window.bulwarkDesktop = { version: 1, platform: 'win32', windows: {} };
   stubLocks();
   sessionStorage.clear();
   heard = [];
diff --git a/lib/__tests__/desktop-window-sync.test.ts b/lib/__tests__/desktop-window-sync.test.ts
index 260c8f788..7ff38a7fc 100644
--- a/lib/__tests__/desktop-window-sync.test.ts
+++ b/lib/__tests__/desktop-window-sync.test.ts
@@ -72,7 +72,7 @@ describe('state across windows', () => {
   });
 
   it('also runs in the desktop app\'s main window', async () => {
-    window.bulwarkDesktop = { windows: {} };
+    window.bulwarkDesktop = { version: 1, platform: 'win32', windows: {} };
     stop = startWindowSync();
     writeFromAnotherWindow('locale-storage', { locale: 'fr' });
     await settle();
@@ -140,7 +140,7 @@ describe('the app-like behaviour', () => {
   });
 
   it('marks the page before the first paint when the bridge is there', () => {
-    window.bulwarkDesktop = {};
+    window.bulwarkDesktop = { version: 1, platform: 'win32' };
     runBoot();
     expect(document.documentElement.hasAttribute('data-desktop')).toBe(true);
   });
diff --git a/lib/__tests__/popout-windows.test.ts b/lib/__tests__/popout-windows.test.ts
index 0832f163e..f3675c552 100644
--- a/lib/__tests__/popout-windows.test.ts
+++ b/lib/__tests__/popout-windows.test.ts
@@ -101,7 +101,7 @@ describe('popoutsAvailable', () => {
 
   it('asks the bridge too: display-mode is `browser` in Electron', async () => {
     stubDisplay({ standalone: false });
-    window.bulwarkDesktop = { windows: {} };
+    window.bulwarkDesktop = { version: 1, platform: 'win32', windows: {} };
     expect(await available()).toBe(true);
   });
 
@@ -168,7 +168,7 @@ describe('opening windows', () => {
   it('leaves it to the bridge when the bridge opens windows, under the same name', async () => {
     const { openMessageWindow } = await import('@/lib/popout/open');
     const bridgeOpen = vi.fn();
-    window.bulwarkDesktop = { windows: { open: bridgeOpen } };
+    window.bulwarkDesktop = { version: 1, platform: 'win32', windows: { open: bridgeOpen } };
     const open = vi.spyOn(window, 'open');
     expect(openMessageWindow({ emailId: 'bridged' })).toBe(true);
     expect(openMessageWindow({ emailId: 'bridged' })).toBe(true);