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Refringe
c071702851
This started as a small update. This pull request includes updates to the `RandomUtil` class to improve the security and accuracy of random number generation by utilizing the `node:crypto` module. Additionally, it enhances the documentation and refactors several methods for clarity and performance. Includes tests, both before and after the changes. The only *possible* breaking change is that now the `getKey`, `getKeyValue`, and `drawRandomFromDict` methods are typed with generics instead of `any`. I tried to keep them as *generic* as possible, but we should probably include this in a BE to ensure it doesn't break anything. No further changes are planned--Saved as a draft because it's late and I still want to review. --------- Co-authored-by: Chomp <27521899+chompDev@users.noreply.github.com>
664 lines
23 KiB
TypeScript
664 lines
23 KiB
TypeScript
import "reflect-metadata";
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import { RandomUtil } from "@spt/utils/RandomUtil";
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import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
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describe("RandomUtil", () => {
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let randomUtil: RandomUtil;
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let mockCloner: any;
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let mockLogger: any;
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beforeEach(() => {
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mockCloner = {
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clone: vi.fn((obj) => JSON.parse(JSON.stringify(obj))),
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};
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mockLogger = {
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warning: vi.fn(),
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info: vi.fn(),
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};
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randomUtil = new RandomUtil(mockCloner, mockLogger);
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});
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afterEach(() => {
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vi.restoreAllMocks();
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});
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describe("getInt", () => {
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it("should return an integer between min and max inclusive when min < max", () => {
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const min = 1;
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const max = 5;
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const result = randomUtil.getInt(min, max);
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expect(result).toBeGreaterThanOrEqual(Math.ceil(min));
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expect(result).toBeLessThanOrEqual(Math.floor(max));
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expect(Number.isInteger(result)).toBe(true);
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});
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it("should handle floating-point min and max values", () => {
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const min = 1.2;
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const max = 5.8;
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const result = randomUtil.getInt(min, max);
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expect(result).toBeGreaterThanOrEqual(Math.ceil(min)); // 2
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expect(result).toBeLessThanOrEqual(Math.floor(max)); // 5
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expect(Number.isInteger(result)).toBe(true);
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});
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it("should return min when min and max are equal", () => {
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const min = 3;
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const max = 3;
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const result = randomUtil.getInt(min, max);
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expect(result).toBe(Math.ceil(min));
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expect(Number.isInteger(result)).toBe(true);
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});
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it("should return min when max is less than min", () => {
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const min = 5;
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const max = 3;
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const result = randomUtil.getInt(min, max);
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expect(result).toBe(Math.ceil(min));
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expect(Number.isInteger(result)).toBe(true);
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});
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it("should handle negative min and max values", () => {
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const min = -5;
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const max = -1;
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const result = randomUtil.getInt(min, max);
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expect(result).toBeGreaterThanOrEqual(Math.ceil(min));
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expect(result).toBeLessThanOrEqual(Math.floor(max));
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expect(Number.isInteger(result)).toBe(true);
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});
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});
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describe("getIntEx", () => {
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it("should return an integer between 1 and max - 2 inclusive when max > 1", () => {
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const max = 10;
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const result = randomUtil.getIntEx(max);
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expect(result).toBeGreaterThanOrEqual(1);
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expect(result).toBeLessThanOrEqual(max - 2);
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expect(Number.isInteger(result)).toBe(true);
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});
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it("should return 1 when max is less than or equal to 1", () => {
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const maxValues = [1, 0, -5];
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for (const max of maxValues) {
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const result = randomUtil.getIntEx(max);
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expect(result).toBe(1);
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}
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});
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it("should handle edge case when max is 2", () => {
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const max = 2;
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const result = randomUtil.getIntEx(max);
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expect(result).toBe(1);
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});
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});
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describe("getFloat", () => {
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it("should return a float between min and max", () => {
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const min = 1.5;
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const max = 5.5;
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const result = randomUtil.getFloat(min, max);
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expect(result).toBeGreaterThanOrEqual(min);
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expect(result).toBeLessThan(max);
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});
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it("should handle negative min and max values", () => {
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const min = -5.5;
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const max = -1.1;
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const result = randomUtil.getFloat(min, max);
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expect(result).toBeGreaterThanOrEqual(min);
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expect(result).toBeLessThan(max);
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});
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it("should return min when min equals max", () => {
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const min = 3.3;
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const max = 3.3;
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const result = randomUtil.getFloat(min, max);
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expect(result).toBe(min);
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});
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});
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describe("getBool", () => {
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it("should return a boolean value", () => {
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const result = randomUtil.getBool();
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expect(typeof result).toBe("boolean");
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});
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it("should return true when Math.random is less than 0.5", () => {
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vi.spyOn(randomUtil as any, "getSecureRandomNumber").mockReturnValue(0.4);
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const result = randomUtil.getBool();
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expect(result).toBe(true);
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});
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it("should return false when getSecureRandomNumber returns 0.5", () => {
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vi.spyOn(randomUtil as any, "getSecureRandomNumber").mockReturnValue(0.5);
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const result = randomUtil.getBool();
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expect(result).toBe(false);
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});
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});
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describe("getPercentOfValue", () => {
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it("should calculate the correct percentage of a number", () => {
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const percent = 25;
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const number = 200;
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const result = randomUtil.getPercentOfValue(percent, number);
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expect(result).toBe(50.0);
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});
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it("should handle decimal percentages and numbers", () => {
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const percent = 12.5;
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const number = 80.4;
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const result = randomUtil.getPercentOfValue(percent, number);
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expect(result).toBeCloseTo(10.05, 2);
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});
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it("should respect the toFixed parameter", () => {
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const percent = 33.3333;
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const number = 100;
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const result = randomUtil.getPercentOfValue(percent, number, 4);
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expect(result).toBe(33.3333);
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});
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});
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describe("reduceValueByPercent", () => {
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it("should reduce the value by the given percentage", () => {
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const number = 200;
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const percentage = 25;
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const result = randomUtil.reduceValueByPercent(number, percentage);
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expect(result).toBe(150);
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});
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it("should handle decimal percentages", () => {
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const number = 100;
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const percentage = 12.5;
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const result = randomUtil.reduceValueByPercent(number, percentage);
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expect(result).toBe(87.5);
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});
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it("should return the same number when percentage is 0", () => {
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const number = 100;
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const percentage = 0;
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const result = randomUtil.reduceValueByPercent(number, percentage);
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expect(result).toBe(100);
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});
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});
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describe("getChance100", () => {
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it("should return true if random number is less than or equal to chancePercent", () => {
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vi.spyOn(randomUtil, "getIntEx").mockReturnValue(50);
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const chancePercent = 60;
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const result = randomUtil.getChance100(chancePercent);
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expect(result).toBe(true);
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expect(randomUtil.getIntEx).toHaveBeenCalledWith(100);
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});
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it("should return false if random number is greater than chancePercent", () => {
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vi.spyOn(randomUtil, "getIntEx").mockReturnValue(70);
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const chancePercent = 60;
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const result = randomUtil.getChance100(chancePercent);
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expect(result).toBe(false);
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});
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});
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describe("getStringArrayValue", () => {
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it("should return a value from the array", () => {
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const arr = ["apple", "banana", "cherry"];
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const result = randomUtil.getStringArrayValue(arr);
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expect(arr).toContain(result);
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});
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it("should handle single-element arrays", () => {
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const arr = ["only"];
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const result = randomUtil.getStringArrayValue(arr);
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expect(result).toBe("only");
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});
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it("should return predictable value when getInt is mocked", () => {
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vi.spyOn(randomUtil, "getInt").mockReturnValue(1);
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const arr = ["first", "second", "third"];
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const result = randomUtil.getStringArrayValue(arr);
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expect(result).toBe("second");
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});
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});
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describe("getArrayValue", () => {
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it("should return a value from the array of numbers", () => {
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const arr = [10, 20, 30, 40];
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const result = randomUtil.getArrayValue(arr);
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expect(arr).toContain(result);
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});
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it("should return a value from the array of objects", () => {
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const arr = [{ id: 1 }, { id: 2 }, { id: 3 }];
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const result = randomUtil.getArrayValue(arr);
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expect(arr).toContain(result);
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});
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it("should return predictable value when getInt is mocked", () => {
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vi.spyOn(randomUtil, "getInt").mockReturnValue(2);
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const arr = ["a", "b", "c", "d"];
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const result = randomUtil.getArrayValue(arr);
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expect(result).toBe("c");
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});
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});
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describe("getKey", () => {
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it("should return a key from the object", () => {
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const obj = { a: 1, b: 2, c: 3 };
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const result = randomUtil.getKey(obj);
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expect(Object.keys(obj)).toContain(result);
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});
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it("should handle single-key objects", () => {
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const obj = { onlyKey: "value" };
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const result = randomUtil.getKey(obj);
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expect(result).toBe("onlyKey");
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});
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it("should handle empty objects", () => {
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const obj = {};
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const result = randomUtil.getKey(obj);
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expect(result).toBeUndefined();
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});
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it("should handle objects with integer keys", () => {
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const obj = { 1: "a", 2: "b", 3: "c" };
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const result = randomUtil.getKey(obj);
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expect(Object.keys(obj)).toContain(result);
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});
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it("should return predictable key when getArrayValue is mocked", () => {
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vi.spyOn(randomUtil, "getArrayValue").mockReturnValue("b");
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const obj = { a: 1, b: 2, c: 3 };
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const result = randomUtil.getKey(obj);
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expect(result).toBe("b");
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});
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});
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describe("getKeyValue", () => {
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it("should return a value from the object", () => {
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vi.spyOn(randomUtil, "getKey").mockReturnValue("b");
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const obj = { a: 1, b: 2, c: 3 };
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const result = randomUtil.getKeyValue(obj);
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expect(result).toBe(2);
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});
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it("should handle objects with complex values", () => {
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vi.spyOn(randomUtil, "getKey").mockReturnValue("key2");
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const obj = { key1: "value1", key2: { nested: true }, key3: [1, 2, 3] };
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const result = randomUtil.getKeyValue(obj);
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expect(result).toEqual({ nested: true });
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});
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});
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describe("getNormallyDistributedRandomNumber", () => {
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it("should return a number close to the mean", () => {
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const mean = 50;
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const sigma = 5;
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const result = randomUtil.getNormallyDistributedRandomNumber(mean, sigma);
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expect(result).toBeGreaterThanOrEqual(0);
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expect(typeof result).toBe("number");
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});
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it("should not return negative numbers", () => {
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const mean = 5;
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const sigma = 10;
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const result = randomUtil.getNormallyDistributedRandomNumber(mean, sigma);
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expect(result).toBeGreaterThanOrEqual(0);
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});
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it("should handle high attempt counts", () => {
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let callCount = 0;
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vi.spyOn(randomUtil as any, "getSecureRandomNumber").mockImplementation(() => {
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callCount++;
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// Alternate between u and v
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if (callCount % 2 === 1) {
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// u values
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return 0.00001;
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}
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// v values
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return 0.5;
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});
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const mean = 5;
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const sigma = 2;
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const result = randomUtil.getNormallyDistributedRandomNumber(mean, sigma);
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// Each attempt increases callCount by 2 (once for u, once for v)
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const attempts = callCount / 2;
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// Ensure that the method attempted multiple times
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expect(attempts).toBeGreaterThan(100);
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// The result should be from the fallback value
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expect(result).toBeGreaterThanOrEqual(0.01);
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expect(result).toBeLessThanOrEqual(mean * 2);
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});
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it("should return a fallback value after many attempts", () => {
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let callCount = 0;
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vi.spyOn(randomUtil as any, "getSecureRandomNumber").mockImplementation(() => {
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// Alternate between u and v
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const value = callCount % 2 === 0 ? 0.0000001 : 0.5;
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callCount++;
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return value;
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});
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// Mock getFloat to return a predictable value
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vi.spyOn(randomUtil, "getFloat").mockReturnValue(7.77);
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const mean = 5;
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const sigma = 2;
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const result = randomUtil.getNormallyDistributedRandomNumber(mean, sigma, 101);
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expect(result).toBe(7.77);
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});
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});
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describe("randInt", () => {
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it("should return an integer between low and high - 1", () => {
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const low = 5;
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const high = 10;
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const result = randomUtil.randInt(low, high);
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expect(result).toBeGreaterThanOrEqual(low);
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expect(result).toBeLessThan(high);
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expect(Number.isInteger(result)).toBe(true);
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});
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it("should return an integer between 0 and low - 1 when high is not provided", () => {
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const low = 5;
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const result = randomUtil.randInt(low);
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expect(result).toBeGreaterThanOrEqual(0);
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expect(result).toBeLessThan(low);
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expect(Number.isInteger(result)).toBe(true);
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});
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it("should handle negative values", () => {
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const low = -10;
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const high = -5;
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const result = randomUtil.randInt(low, high);
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expect(result).toBeGreaterThanOrEqual(low);
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expect(result).toBeLessThan(high);
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});
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});
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describe("drawRandomFromList", () => {
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it("should draw elements with replacement", () => {
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const list = [1, 2, 3, 4, 5];
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const count = 3;
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const result = randomUtil.drawRandomFromList(list, count, true);
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expect(result.length).toBe(count);
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for (const item of result) {
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expect(list).toContain(item);
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}
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});
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it("should draw elements without replacement", () => {
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mockCloner.clone.mockImplementation((obj) => [...obj]);
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const list = [1, 2, 3, 4, 5];
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const count = 3;
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const result = randomUtil.drawRandomFromList(list, count, false);
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expect(result.length).toBe(count);
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expect(new Set(result).size).toBe(count);
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});
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it("should clone the original list when drawing without replacement", () => {
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const list = [1, 2, 3];
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randomUtil.drawRandomFromList(list, 2, false);
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expect(mockCloner.clone).toHaveBeenCalledWith(list);
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});
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it("should handle count greater than list length without replacement", () => {
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const list = [1, 2, 3];
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const count = 5;
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const result = randomUtil.drawRandomFromList(list, count, false);
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expect(result.length).toBe(3);
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});
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it("should adjust count when count exceeds list length without replacement", () => {
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const list = [10, 20, 30];
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const count = 4; // Count exceeds list length
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const result = randomUtil.drawRandomFromList(list, count, false);
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// The result should contain all elements from the list without duplicates
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expect(result.length).toBe(3); // Should be adjusted to list length
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expect(new Set(result).size).toBe(3);
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// Ensure that the result contains all elements from the original list
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expect(result.sort()).toEqual(list.sort());
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});
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});
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describe("drawRandomFromDict", () => {
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it("should draw keys from the dictionary with replacement", () => {
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const dict = { a: 1, b: 2, c: 3 };
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const count = 2;
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const result = randomUtil.drawRandomFromDict(dict, count, true);
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expect(result.length).toBe(count);
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for (const key of result) {
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expect(Object.keys(dict)).toContain(key);
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}
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});
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it("should draw keys without replacement", () => {
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const dict = { a: 1, b: 2, c: 3 };
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const count = 2;
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const result = randomUtil.drawRandomFromDict(dict, count, false);
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expect(result.length).toBe(count);
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expect(new Set(result).size).toBe(count);
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});
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it("should handle single-key dictionaries", () => {
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const dict = { onlyKey: 1 };
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const count = 2;
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const result = randomUtil.drawRandomFromDict(dict, count, false);
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expect(result.length).toBe(1);
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expect(result).toEqual(["onlyKey"]);
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});
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it("should handle dictionaries with integer keys", () => {
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const dict = { 1: "a", 2: "b", 3: "c" };
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const count = 2;
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const result = randomUtil.drawRandomFromDict(dict, count, false);
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expect(result.length).toBe(count);
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for (const key of result) {
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expect(Object.keys(dict)).toContain(key);
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}
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});
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it("should handle count greater than number of keys without replacement", () => {
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const dict = { a: 1, b: 2 };
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const count = 3;
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const result = randomUtil.drawRandomFromDict(dict, count, false);
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expect(result.length).toBe(2);
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});
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it("should adjust count when count exceeds number of keys without replacement", () => {
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const dict = { a: 1, b: 2, c: 3 };
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const count = 5; // Count exceeds number of keys
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const result = randomUtil.drawRandomFromDict(dict, count, false);
|
|
|
|
// The result should contain all keys without duplicates
|
|
expect(result.length).toBe(3); // Should be adjusted to number of keys
|
|
expect(new Set(result).size).toBe(3);
|
|
|
|
// Ensure that the result contains all keys from the dictionary
|
|
const dictKeys = Object.keys(dict);
|
|
expect(result.sort()).toEqual(dictKeys.sort());
|
|
});
|
|
});
|
|
|
|
describe("getBiasedRandomNumber", () => {
|
|
it("should return a number within the range", () => {
|
|
const min = 1;
|
|
const max = 10;
|
|
const shift = 2;
|
|
const n = 2;
|
|
const result = randomUtil.getBiasedRandomNumber(min, max, shift, n);
|
|
|
|
expect(result).toBeGreaterThanOrEqual(min);
|
|
expect(result).toBeLessThanOrEqual(max);
|
|
});
|
|
|
|
it("should throw error when max < min", () => {
|
|
expect(() => randomUtil.getBiasedRandomNumber(10, 5, 0, 2)).toThrowError(
|
|
"Bounded random number generation max is smaller than min (5 < 10)",
|
|
);
|
|
});
|
|
|
|
it("should throw error when n < 1", () => {
|
|
expect(() => randomUtil.getBiasedRandomNumber(1, 10, 0, 0)).toThrowError(
|
|
"'n' must be 1 or greater (received 0)",
|
|
);
|
|
});
|
|
|
|
it("should log warning when shift is greater than range", () => {
|
|
const min = 1;
|
|
const max = 5;
|
|
const shift = 10;
|
|
const n = 2;
|
|
randomUtil.getBiasedRandomNumber(min, max, shift, n);
|
|
|
|
expect(mockLogger.warning).toHaveBeenCalled();
|
|
expect(mockLogger.info).toHaveBeenCalledWith(`min -> ${min}; max -> ${max}; shift -> ${shift}`);
|
|
});
|
|
|
|
it("should return predictable result when getSecureRandomNumber is mocked", () => {
|
|
vi.spyOn(randomUtil as any, "getSecureRandomNumber").mockReturnValue(0.5);
|
|
|
|
const min = 1;
|
|
const max = 10;
|
|
const shift = 0;
|
|
const n = 2; // n affects how many times getSecureRandomNumber is summed/averaged
|
|
|
|
// With getSecureRandomNumber always returning 0.5,
|
|
// gaussianRandom(n) = 0.5 no matter what
|
|
// boundedGaussian(start, end, n) = round(start + 0.5 * (end - start + 1))
|
|
|
|
// For shift = 0:
|
|
// biasedMin = min = 1
|
|
// biasedMax = max = 10
|
|
// boundedGaussian(1, 10, 2) = round(1 + 0.5*(10 - 1 + 1)) = round(1 + 0.5*10) = round(1+5) = 6
|
|
|
|
// The loop ensures num is within [min, max], and since 6 is within [1,10], it returns 6 immediately.
|
|
const result = randomUtil.getBiasedRandomNumber(min, max, shift, n);
|
|
|
|
expect(result).toBe(6);
|
|
});
|
|
});
|
|
|
|
describe("shuffle", () => {
|
|
it("should shuffle the array", () => {
|
|
const array = [1, 2, 3, 4, 5];
|
|
const shuffled = randomUtil.shuffle([...array]);
|
|
|
|
expect(shuffled).toHaveLength(array.length);
|
|
expect(shuffled).not.toEqual(array);
|
|
expect(shuffled.sort()).toEqual(array.sort());
|
|
});
|
|
|
|
it("should handle empty arrays", () => {
|
|
const array: any[] = [];
|
|
const shuffled = randomUtil.shuffle(array);
|
|
|
|
expect(shuffled).toEqual([]);
|
|
});
|
|
|
|
it("should return the same array when array length is 1", () => {
|
|
const array = [1];
|
|
const shuffled = randomUtil.shuffle(array);
|
|
|
|
expect(shuffled).toEqual([1]);
|
|
});
|
|
});
|
|
|
|
describe("rollForChanceProbability", () => {
|
|
it("should return true when rolled chance is less than or equal to probabilityChance", () => {
|
|
vi.spyOn(randomUtil as any, "getSecureRandomNumber").mockReturnValue(0.5);
|
|
|
|
const probabilityChance = 0.6;
|
|
const result = randomUtil.rollForChanceProbability(probabilityChance);
|
|
|
|
expect(result).toBe(true);
|
|
});
|
|
|
|
it("should return false when rolled chance is greater than probabilityChance", () => {
|
|
vi.spyOn(randomUtil as any, "getSecureRandomNumber").mockReturnValue(0.7);
|
|
|
|
const probabilityChance = 0.6;
|
|
const result = randomUtil.rollForChanceProbability(probabilityChance);
|
|
|
|
expect(result).toBe(false);
|
|
});
|
|
|
|
it("should handle probabilityChance of 0", () => {
|
|
vi.spyOn(randomUtil as any, "getSecureRandomNumber").mockReturnValue(0.1);
|
|
|
|
const probabilityChance = 0;
|
|
const result = randomUtil.rollForChanceProbability(probabilityChance);
|
|
|
|
expect(result).toBe(false);
|
|
});
|
|
|
|
it("should handle probabilityChance of 1", () => {
|
|
vi.spyOn(randomUtil as any, "getSecureRandomNumber").mockReturnValue(0.99);
|
|
|
|
const probabilityChance = 1;
|
|
const result = randomUtil.rollForChanceProbability(probabilityChance);
|
|
|
|
expect(result).toBe(true);
|
|
});
|
|
});
|
|
});
|