@alcorexchange/alcor-swap-sdk/test/nearestUsableTick.test.ts

## Installation ​​ **npm** ``` npm i @alcorexchange/alcor-swap-sdk ``` **yarn** ``` yarn add @alcorexchange/alcor-swap-sdk ``` ## Usage ### Import:

import { nearestUsableTick } from "utils/nearestUsableTick";
import { TickMath } from "utils/tickMath";

describe("#nearestUsableTick", () => {
  it("throws if tickSpacing is 0", () => {
    expect(() => nearestUsableTick(1, 0)).toThrow("TICK_SPACING");
  });

  it("throws if tickSpacing is negative", () => {
    expect(() => nearestUsableTick(1, -5)).toThrow("TICK_SPACING");
  });

  it("throws if either is non-integer", () => {
    expect(() => nearestUsableTick(1.5, 1)).toThrow("INTEGERS");
    expect(() => nearestUsableTick(1, 1.5)).toThrow("INTEGERS");
  });

  it("throws if tick is greater than TickMath.MAX_TICK", () => {
    expect(() => nearestUsableTick(TickMath.MAX_TICK + 1, 1)).toThrow(
      "TICK_BOUND"
    );
    expect(() => nearestUsableTick(TickMath.MIN_TICK - 1, 1)).toThrow(
      "TICK_BOUND"
    );
  });

  it("rounds at positive half", () => {
    expect(nearestUsableTick(5, 10)).toEqual(10);
  });

  it("rounds down below positive half", () => {
    expect(nearestUsableTick(4, 10)).toEqual(0);
  });

  it("rounds up for negative half", () => {
    expect(nearestUsableTick(-5, 10)).toEqual(-0);
  });

  it("rounds up for negative half", () => {
    expect(nearestUsableTick(-6, 10)).toEqual(-10);
  });

  it("cannot round past MIN_TICK", () => {
    expect(
      nearestUsableTick(TickMath.MIN_TICK, TickMath.MAX_TICK / 2 + 100)
    ).toEqual(-(TickMath.MAX_TICK / 2 + 100));
  });

  it("cannot round past MAX_TICK", () => {
    expect(
      nearestUsableTick(TickMath.MAX_TICK, TickMath.MAX_TICK / 2 + 100)
    ).toEqual(TickMath.MAX_TICK / 2 + 100);
  });
});