test(useUpdateEffect): add tests

Author: ariser

src/hooks/useUpdateEffect.test.ts

@@ -0,0 +1,52 @@
+import { renderHook } from "@testing-library/react";
+import { useUpdateEffect } from "./useUpdateEffect";
+
+describe("useUpdateEffect", () => {
+  it("should not run the effect on the first render", () => {
+    const effect = vi.fn();
+
+    renderHook(() => useUpdateEffect(effect));
+
+    // The effect should not have been called yet
+    expect(effect).not.toHaveBeenCalled();
+  });
+
+  it("should run the effect on subsequent renders", () => {
+    const effect = vi.fn();
+
+    const { rerender } = renderHook(() => {
+      useUpdateEffect(effect);
+    });
+
+    rerender();
+
+    // The effect should have been called once
+    expect(effect).toHaveBeenCalledTimes(1);
+  });
+
+  it("should run the effect when dependencies change", () => {
+    const effect = vi.fn();
+
+    const { rerender } = renderHook((dependency: string = "initial_dependency") =>
+      useUpdateEffect(effect, [dependency])
+    );
+
+    rerender("updated_dependency");
+
+    // The effect should have been called once
+    expect(effect).toHaveBeenCalledTimes(1);
+  });
+
+  it("should not run the effect if dependencies do not change", () => {
+    const effect = vi.fn();
+
+    const { rerender } = renderHook((dependency: string = "same_dependency") =>
+      useUpdateEffect(effect, [dependency])
+    );
+
+    rerender("same_dependency");
+
+    // The effect should not have been called again
+    expect(effect).toHaveBeenCalledTimes(0);
+  });
+});