snapshot of https://github.com/RocketChat/Rocket.Chat.git (develop, 2026-09-16; blobs > 131072B omitted)

apps/meteor/client/views/room/providers/hooks/useInstance.spec.ts

@@ -0,0 +1,61 @@
+import { renderHook } from '@testing-library/react';
+
+import { useInstance } from './useInstance';
+
+class MockChatMessages {
+	release() {
+		return 'released';
+	}
+}
+
+describe('useInstance', () => {
+	let factory: jest.Mock;
+	let release: jest.Mock;
+
+	beforeEach(() => {
+		jest.clearAllMocks();
+
+		release = jest.fn();
+		factory = jest.fn().mockReturnValue([{ instance: new MockChatMessages() }, release]);
+	});
+
+	it('should create a new instance when dependencies change', () => {
+		const { result, rerender } = renderHook(({ deps }) => useInstance(factory, deps), {
+			initialProps: { deps: ['initial-dep'] },
+		});
+
+		expect(result.current).toEqual({ instance: new MockChatMessages() });
+		expect(factory).toHaveBeenCalledTimes(1);
+		expect(release).toHaveBeenCalledTimes(0);
+
+		rerender({ deps: ['new-dep'] });
+
+		expect(result.current).toEqual({ instance: new MockChatMessages() });
+		expect(factory).toHaveBeenCalledTimes(2);
+		expect(release).toHaveBeenCalledTimes(1);
+	});
+
+	it('should not create a new instance when dependencies do not change', () => {
+		const { result, rerender } = renderHook(({ deps }) => useInstance(factory, deps), {
+			initialProps: { deps: ['initial-dep'] },
+		});
+
+		expect(result.current).toEqual({ instance: new MockChatMessages() });
+		expect(factory).toHaveBeenCalledTimes(1);
+		expect(release).toHaveBeenCalledTimes(0);
+
+		rerender({ deps: ['initial-dep'] });
+
+		expect(result.current).toEqual({ instance: new MockChatMessages() });
+		expect(factory).toHaveBeenCalledTimes(1);
+		expect(release).toHaveBeenCalledTimes(0);
+	});
+
+	it('should call release function when component unmounts', () => {
+		const { unmount } = renderHook(() => useInstance(factory, ['initial-dep']));
+
+		unmount();
+
+		expect(release).toHaveBeenCalledTimes(1);
+	});
+});