diff --git a/components/email/__tests__/reader-plugin-surfaces.test.tsx b/components/email/__tests__/reader-plugin-surfaces.test.tsx
index 28d5f4745..47ce9152e 100644
--- a/components/email/__tests__/reader-plugin-surfaces.test.tsx
+++ b/components/email/__tests__/reader-plugin-surfaces.test.tsx
@@ -360,7 +360,8 @@ describe('thread-summary', () => {
     render(<ThreadConversationView thread={thread} emails={[conversation[1], conversation[0]]} onBack={() => {}} />);
 
     const frame = screen.getByTestId('slot-thread-summary');
-    expect(slotProps(frame)).toEqual({ threadId: 't1', emailIds: ['m2', 'm1'], deviceType: 'mobile' });
+    // Oldest first, as the cards below it.
+    expect(slotProps(frame)).toEqual({ threadId: 't1', emailIds: ['m1', 'm2'], deviceType: 'mobile' });
     expect(follows(frame, screen.getAllByText('Alice')[0])).toBe(true);
   });
 
diff --git a/components/email/__tests__/viewer-read-hooks.test.tsx b/components/email/__tests__/viewer-read-hooks.test.tsx
index c59018986..2e1bb8120 100644
--- a/components/email/__tests__/viewer-read-hooks.test.tsx
+++ b/components/email/__tests__/viewer-read-hooks.test.tsx
@@ -148,11 +148,11 @@ describe('onThreadExpand in the conversation view', () => {
         onBack={() => {}}
       />,
     );
-    // The newest card starts unfolded, the older read one folded.
-    const olderHeader = screen.getAllByText('Alice').at(-1)!;
+    // Oldest first: the older read card on top, folded; the newest below it, unfolded.
+    const olderHeader = screen.getAllByText('Alice')[0];
     fireEvent.click(olderHeader);
     expect(handler).toHaveBeenLastCalledWith({ threadId: 't1', emailIds: ['old'], expanded: true });
-    fireEvent.click(screen.getAllByText('Alice').at(-1)!);
+    fireEvent.click(screen.getAllByText('Alice')[0]);
     expect(handler).toHaveBeenLastCalledWith({ threadId: 't1', emailIds: ['old'], expanded: false });
     expect(handler).toHaveBeenCalledTimes(2);
   });