import { Measure } from "../../measure/numberMeasure";
import { degrees, piRadians } from "../angle";
import { meters, radians } from "../base";
import * as Trig from "../trig";

describe("Trig", () => {
  const zeroRadians = Measure.of(0, radians);
  const zero = Measure.dimensionless(0);

  it("normal", () => {
    expect(Trig.cos(zeroRadians)).toEqual(Measure.dimensionless(1));
    expect(Trig.sin(zeroRadians)).toEqual(zero);
    expect(Trig.tan(zeroRadians)).toEqual(zero);
  });

  it("inverse", () => {
    expect(Trig.acos(zero)).toEqual(Measure.of(0.5, piRadians));
    expect(Trig.asin(zero)).toEqual(zeroRadians);
    expect(Trig.atan(zero)).toEqual(zeroRadians);
    expect(Trig.atan2(Measure.of(5, meters), Measure.of(5, meters))).toEqual(
      Measure.of(45, degrees),
    );
  });
});