test(stackflow): Add id/time Test Code

core/src/utils/id.spec.ts

@@ -0,0 +1,26 @@
+import { id } from "./id";
+
+beforeAll(() => {
+  jest.useFakeTimers();
+});
+
+const getCalculatedId = (time: number) => (time * 1000).toString(16);
+
+test("id - time() 값을 기반으로 유니크한 아이디 값을 반환한다.", () => {
+  const expectedTime1 = new Date("2023-08-06").getTime(); // 1691280000000
+  const expectedTime2 = new Date("2023-08-07").getTime(); // 1691366400000
+
+  jest.setSystemTime(expectedTime1);
+
+  expect(id()).toBe(getCalculatedId(expectedTime1));
+  expect(id()).toBe(getCalculatedId((expectedTime1 * 1000 + 1) / 1000));
+  expect(id()).toBe(getCalculatedId((expectedTime1 * 1000 + 2) / 1000));
+  expect(id()).toBe(getCalculatedId((expectedTime1 * 1000 + 3) / 1000));
+
+  jest.setSystemTime(expectedTime2);
+
+  expect(id()).toBe(getCalculatedId(expectedTime2));
+  expect(id()).toBe(getCalculatedId((expectedTime2 * 1000 + 1) / 1000));
+  expect(id()).toBe(getCalculatedId((expectedTime2 * 1000 + 2) / 1000));
+  expect(id()).toBe(getCalculatedId((expectedTime2 * 1000 + 3) / 1000));
+});

core/src/utils/time.spec.ts

@@ -0,0 +1,24 @@
+import { time } from "./time";
+
+beforeAll(() => {
+  jest.useFakeTimers();
+});
+
+test("time - 기본적으로 getTime() 값을 반환하며, 이전 호출과 현재 호출 사이에 시간이 동일한 경우 중복을 방지한다.", () => {
+  const expectedTime1 = new Date("2023-08-06").getTime(); // 1691280000000
+  const expectedTime2 = new Date("2023-08-07").getTime(); // 1691366400000
+
+  jest.setSystemTime(expectedTime1);
+
+  expect(time()).toBe(expectedTime1);
+  expect(time()).toBe((expectedTime1 * 1000 + 1) / 1000);
+  expect(time()).toBe((expectedTime1 * 1000 + 2) / 1000);
+  expect(time()).toBe((expectedTime1 * 1000 + 3) / 1000);
+
+  jest.setSystemTime(expectedTime2);
+
+  expect(time()).toBe(expectedTime2);
+  expect(time()).toBe((expectedTime2 * 1000 + 1) / 1000);
+  expect(time()).toBe((expectedTime2 * 1000 + 2) / 1000);
+  expect(time()).toBe((expectedTime2 * 1000 + 3) / 1000);
+});