[test]: useIsFirstRender

src/hooks/useIsFirstRender/useIsFirstRender.test.ts

@@ -0,0 +1,35 @@
+import { renderHook } from '@testing-library/react';
+
+import { useIsFirstRender } from './useIsFirstRender';
+
+it('Should return true on the first render', () => {
+  const { result } = renderHook(useIsFirstRender);
+
+  expect(result.current).toBe(true);
+});
+
+it('Should return false on subsequent renders', () => {
+  const { result, rerender } = renderHook(useIsFirstRender);
+
+  expect(result.current).toBe(true);
+
+  rerender();
+  expect(result.current).toBe(false);
+
+  rerender();
+  expect(result.current).toBe(false);
+});
+
+it('Should maintain state across multiple components', () => {
+  const { result: result1, rerender: rerender1 } = renderHook(useIsFirstRender);
+  const { result: result2, rerender: rerender2 } = renderHook(useIsFirstRender);
+
+  expect(result1.current).toBe(true);
+  expect(result2.current).toBe(true);
+
+  rerender1();
+  expect(result1.current).toBe(false);
+
+  rerender2();
+  expect(result2.current).toBe(false);
+});