diff --git a/frontend/src/lib/planner/EffortBar.test.ts b/frontend/src/lib/planner/EffortBar.test.ts
index f08302f..00e951d 100644
--- a/frontend/src/lib/planner/EffortBar.test.ts
+++ b/frontend/src/lib/planner/EffortBar.test.ts
@@ -28,4 +28,11 @@ describe('EffortBar', () => {
 		render(EffortBar, { props: { easy: 3, medium: 3, hard: 1 } });
 		expect(screen.getByTestId('effort-easy').textContent).toContain('×3');
 	});
+
+	it('renders no segments when all counts are zero', () => {
+		render(EffortBar, { props: { easy: 0, medium: 0, hard: 0 } });
+		expect(screen.queryByTestId('effort-easy')).toBeNull();
+		expect(screen.queryByTestId('effort-medium')).toBeNull();
+		expect(screen.queryByTestId('effort-hard')).toBeNull();
+	});
 });