test: react package의 useIsFirstRender, useUpdateEffect hook 테스트 추가

packages/react/src/hooks/useIsFirstRender.test.ts

@@ -0,0 +1,27 @@
+import { act, renderHook } from '@testing-library/react';
+
+import useIsFirstRender from './useIsFirstRender';
+
+describe('useIsFirstRender', () => {
+  const useIsFirstRenderHook = () => renderHook(useIsFirstRender);
+
+  context('첫 렌더링인 경우', () => {
+    it('true를 반환해야만 한다', () => {
+      const { result } = useIsFirstRenderHook();
+
+      expect(result.current).toBe(true);
+    });
+  });
+
+  context('첫 렌더링이 아닌 경우', () => {
+    it('false를 반환해야만 한다', () => {
+      const { result, rerender } = useIsFirstRenderHook();
+
+      act(() => {
+        rerender();
+      });
+
+      expect(result.current).toBe(false);
+    });
+  });
+});

packages/react/src/hooks/useUpdateEffect.test.ts

@@ -0,0 +1,37 @@
+import { renderHook } from '@testing-library/react';
+
+import useIsFirstRender from './useIsFirstRender';
+import useUpdateEffect from './useUpdateEffect';
+
+jest.mock('./useIsFirstRender');
+
+describe('useUpdateEffect', () => {
+  const effectCallback = jest.fn();
+
+  beforeEach(() => {
+    (useIsFirstRender as jest.Mock).mockImplementation(() => given.isFirstRender);
+    jest.clearAllMocks();
+  });
+
+  const useUpdateEffectHook = () => renderHook(() => useUpdateEffect(effectCallback, []));
+
+  context('첫 랜더링인 경우', () => {
+    given('isFirstRender', () => true);
+
+    it('effect callback 함수는 호출되지 않아만한다', () => {
+      useUpdateEffectHook();
+
+      expect(effectCallback).not.toHaveBeenCalled();
+    });
+  });
+
+  context('첫 렌더링이 아닌 경우', () => {
+    given('isFirstRender', () => false);
+
+    it('첫 랜더링이 아닌 경우 effect callback 함수는 호출되어야만 한다', () => {
+      useUpdateEffectHook();
+
+      expect(effectCallback).toHaveBeenCalledTimes(1);
+    });
+  });
+});