Improve test cases from components and utils

src/utils/__tests__/debounce.spec.ts

@@ -0,0 +1,24 @@
+import { it, expect, vi, type Mock } from "vitest";
+import { debounce } from "../debounce";
+
+vi.useFakeTimers();
+
+describe("debounce function test", () => {
+  let mockFunction: Mock;
+  let debounceFunction: Function;
+
+  beforeEach(() => {
+    mockFunction = vi.fn();
+    debounceFunction = debounce(mockFunction, 1000);
+  });
+
+  it("debounce function will be executed just once", () => {
+    for (let i = 0; i < 100; i++) {
+      debounceFunction();
+    }
+
+    vi.runAllTimers();
+
+    expect(mockFunction).toBeCalledTimes(1);
+  });
+});