예제 소스

ranking.test.mjs

import assert from "node:assert/strict";
import test from "node:test";
import { applyRankOutcome, promotionTarget, rankLabel } from "./ranking.ts";

test("급수 구간별 승급 승점", () => {
  assert.equal(promotionTarget(0), 3); // 18급
  assert.equal(promotionTarget(7), 3); // 11급
  assert.equal(promotionTarget(8), 5); // 10급
  assert.equal(promotionTarget(13), 5); // 5급
  assert.equal(promotionTarget(14), 10); // 4급
  assert.equal(promotionTarget(17), 10); // 1급
  assert.equal(promotionTarget(18), 15); // 1단
});

test("승급 시 승점을 초기화하고 다음 급수로 이동", () => {
  assert.deepEqual(applyRankOutcome(0, 2, "win"), {
    rankLevel: 1,
    rankPoints: 0,
    promoted: true,
    demoted: false,
  });
  assert.equal(rankLabel(1), "17급");
  assert.deepEqual(applyRankOutcome(17, 9, "win"), {
    rankLevel: 18,
    rankPoints: 0,
    promoted: true,
    demoted: false,
  });
  assert.equal(rankLabel(18), "1단");
});

test("패배는 -1점, 무승부는 승점 유지", () => {
  assert.deepEqual(applyRankOutcome(8, 0, "loss"), {
    rankLevel: 8,
    rankPoints: -1,
    promoted: false,
    demoted: false,
  });
  assert.deepEqual(applyRankOutcome(18, 7, "draw"), {
    rankLevel: 18,
    rankPoints: 7,
    promoted: false,
    demoted: false,
  });
});

test("구간별 음수 기준에 도달하면 한 급 내려가고 승점을 초기화", () => {
  assert.deepEqual(applyRankOutcome(1, -2, "loss"), {
    rankLevel: 0,
    rankPoints: 0,
    promoted: false,
    demoted: true,
  });
  assert.deepEqual(applyRankOutcome(8, -4, "loss"), {
    rankLevel: 7,
    rankPoints: 0,
    promoted: false,
    demoted: true,
  });
  assert.deepEqual(applyRankOutcome(14, -9, "loss"), {
    rankLevel: 13,
    rankPoints: 0,
    promoted: false,
    demoted: true,
  });
  assert.deepEqual(applyRankOutcome(18, -14, "loss"), {
    rankLevel: 17,
    rankPoints: 0,
    promoted: false,
    demoted: true,
  });
});

test("18급에서는 더 강등하지 않고 승점만 초기화", () => {
  assert.deepEqual(applyRankOutcome(0, -2, "loss"), {
    rankLevel: 0,
    rankPoints: 0,
    promoted: false,
    demoted: false,
  });
});