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

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

import JSBI from "jsbi";
import { ONE } from "internalConstants";
import { TickMath } from "utils/tickMath";

describe("TickMath", () => {
  describe("#MIN_TICK", () => {
    it("equals correct value", () => {
      expect(TickMath.MIN_TICK).toEqual(-443636);
    });
  });

  describe("#MAX_TICK", () => {
    it("equals correct value", () => {
      expect(TickMath.MAX_TICK).toEqual(443636);
    });
  });

  describe("#getSqrtRatioAtTick", () => {
    it("throws for non integer", () => {
      expect(() => TickMath.getSqrtRatioAtTick(1.5)).toThrow("TICK");
    });

    it("throws for tick too small", () => {
      expect(() => TickMath.getSqrtRatioAtTick(TickMath.MIN_TICK - 1)).toThrow(
        "TICK"
      );
    });

    it("throws for tick too large", () => {
      expect(() => TickMath.getSqrtRatioAtTick(TickMath.MAX_TICK + 1)).toThrow(
        "TICK"
      );
    });

    it("returns the correct value for min tick", () => {
      expect(TickMath.getSqrtRatioAtTick(TickMath.MIN_TICK)).toEqual(
        TickMath.MIN_SQRT_RATIO
      );
    });

    it("returns the correct value for tick 0", () => {
      expect(TickMath.getSqrtRatioAtTick(0)).toEqual(
        JSBI.leftShift(JSBI.BigInt(1), JSBI.BigInt(64))
      );
    });

    it("returns the correct value for max tick", () => {
      expect(TickMath.getSqrtRatioAtTick(TickMath.MAX_TICK)).toEqual(
        TickMath.MAX_SQRT_RATIO
      );
    });
  });

  describe("#getTickAtSqrtRatio", () => {
    it("returns the correct value for sqrt ratio at min tick", () => {
      expect(TickMath.getTickAtSqrtRatio(TickMath.MIN_SQRT_RATIO)).toEqual(
        TickMath.MIN_TICK
      );
    });
    it("returns the correct value for sqrt ratio at max tick", () => {
      expect(
        TickMath.getTickAtSqrtRatio(JSBI.subtract(TickMath.MAX_SQRT_RATIO, ONE))
      ).toEqual(TickMath.MAX_TICK - 1);
    });
  });
});