How to use the js-quantities function in js-quantities

it("should convert value", () => {
          // TODO Same test but with m/h -> ft/s triggers rounding issue
          // (For the sake of speed, converter does not check and fix rounding issues)
          const converter = Qty.swiftConverter("m/h", "m/s");

          expect(converter(2500)).toEqual(Qty("2500 m/h").to("m/s").scalar);
        });

it("should convert temperatures to temperature degrees", () => {
      // according to ruby-units, temp -> deg conversion always uses the 0 relative degrees
      let qty = Qty("100 tempC");
      expect(qty.to("degC").scalar).toBe(100);

      qty = Qty("0 tempK");
      expect(qty.to("degC").scalar).toBe(0);

      qty = Qty("0 tempF");
      expect(qty.to("degK").scalar).toBe(0);

      qty = Qty("18 tempF");
      expect(qty.to("degC").scalar).toBe(10);

      qty = Qty("10 tempC");
      expect(qty.to("degF").scalar).toBe(18);
    });

it("should add temperature degrees", () => {
      let qty = Qty("2degC");
      expect(qty.add("3degF").scalar).toBeCloseTo(11 / 3, 10);
      expect(qty.add("-1degC").scalar).toBe(1);

      qty = Qty("2 degC");
      let result = qty.add("2 degF");
      expect(result.scalar).toBe(28 / 9);
      expect(result.units()).toBe("degC");

      qty = Qty("2degK");
      result = qty.add("3degC");
      expect(result.scalar).toBe(5);
      expect(result.units()).toBe("degK");

      qty = Qty("2degC");
      result = qty.add("2degK");
      expect(result.scalar).toBe(4);
      expect(result.units()).toBe("degC");
    });

it("should return unit part of quantities", () => {
      let qty = Qty("1");
      expect(qty.units()).toBe("");
      qty = Qty("1 /s");
      expect(qty.units()).toBe("1/s");
      qty = Qty("100 cm");
      expect(qty.units()).toBe("cm");
      qty = Qty("100 cm/s");
      expect(qty.units()).toBe("cm/s");
      qty = Qty("1 cm^2");
      expect(qty.units()).toBe("cm2");
      qty = Qty("1 cm^2/s^2");
      expect(qty.units()).toBe("cm2/s2");
      qty = Qty("1 cm^2*J^3/s^2*A^2");
      expect(qty.units()).toBe("cm2*J3/s2*A2");
    });
  });

it("should create with negative powers", () => {
      const qty = Qty("1 m^2 s^-2");
      expect(qty.scalar).toBe(1);
      expect(qty.numerator).toEqual(["<meter>", "<meter>"]);
      expect(qty.denominator).toEqual(["", ""]);
      expect(qty.same(Qty("1 m^2/s^2"))).toBe(true);
    });
</meter></meter>

it("should multiply unlike quantities", () => {
      let qty1 = Qty("2.5 m");
      let qty2 = Qty("3 N");

      let result = qty1.mul(qty2);
      expect(result.scalar).toBe(7.5);

      qty1 = Qty("2.5 m^2");
      qty2 = Qty("3 kg/m^2");

      result = qty1.mul(qty2);
      expect(result.scalar).toBe(7.5);
      expect(result.units()).toBe("kg");
    });

it("should convert from unitless to %", () => {
        expect(Qty("0.1").to("%").same(Qty("10 %"))).toBe(true);
      });
    });

it("should return unit part of quantities", () => {
      let qty = Qty("1");
      expect(qty.units()).toBe("");
      qty = Qty("1 /s");
      expect(qty.units()).toBe("1/s");
      qty = Qty("100 cm");
      expect(qty.units()).toBe("cm");
      qty = Qty("100 cm/s");
      expect(qty.units()).toBe("cm/s");
      qty = Qty("1 cm^2");
      expect(qty.units()).toBe("cm2");
      qty = Qty("1 cm^2/s^2");
      expect(qty.units()).toBe("cm2/s2");
      qty = Qty("1 cm^2*J^3/s^2*A^2");
      expect(qty.units()).toBe("cm2*J3/s2*A2");
    });
  });

it("should divide temperature degree quantities", () => {
      const qty = Qty("2.5 degF");

      expect(() => { qty.div("0 degF"); }).toThrow("Divide by zero");
      expect(() => { qty.div(0); }).toThrow("Divide by zero");
      expect(Qty("0 degF").div(qty).scalar).toBe(0);
      expect(Qty("0 degF").div(qty).units()).toBe("");

      let result = qty.div("3 degF");
      expect(result.scalar).toBe(2.5 / 3);
      expect(result.units()).toBe("");
      expect(result.kind()).toBe("unitless");

      result = qty.div(3);
      expect(result.scalar).toBe(2.5 / 3);
      expect(result.units()).toBe("degF");
      expect(result.kind()).toBe("temperature");

expect(result.scalar).toBe(750);
      expect(result.units()).toBe("cm2");

      result = qty1.mul(3.5);
      expect(result.scalar).toBe(8.75);
      expect(result.units()).toBe("m");

      result = qty1.mul(0);
      expect(result.scalar).toBe(0);
      expect(result.units()).toBe("m");

      result = qty1.mul(Qty("0m"));
      expect(result.scalar).toBe(0);
      expect(result.units()).toBe("m2");

      qty2 = Qty("1.458 m");
      result = qty1.mul(qty2);
      expect(result.scalar).toBe(3.645);
      expect(result.units()).toBe("m2");
    });