web/src/math/Ratio.test.ts


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import { describe, expect, test } from "vitest";
import Ratio from "./Ratio";

describe(Ratio, () => {
  describe(Ratio.prototype.add, () => {
    test("returns fractions in simplest form", () => {
      const a = Ratio.fromInteger(0);
      const b = new Ratio(1, 4);

      const c = a.add(b);
      expect(c.numerator).toBe(1);
      expect(c.denominator).toBe(4);

      const d = c.add(b);
      expect(d.numerator).toBe(1);
      expect(d.denominator).toBe(2);

      const e = d.add(b);
      expect(e.numerator).toBe(3);
      expect(e.denominator).toBe(4);

      const f = e.add(b);
      expect(f.numerator).toBe(1);
      expect(f.denominator).toBe(1);
    });
  });
});