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61 lines
1.9 KiB
61 lines
1.9 KiB
import { describe, expect, it } from "vitest";
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import { createRng, normalizeSeed } from "../../src/game/chase/rng";
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describe("chase rng", () => {
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it("generates the same sequence for the same seed", () => {
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const seed = 12345;
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const rngA = createRng(seed);
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const rngB = createRng(seed);
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const sequenceA = Array.from({ length: 5 }, () => rngA());
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const sequenceB = Array.from({ length: 5 }, () => rngB());
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expect(sequenceA).toEqual(sequenceB);
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});
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it("keeps createRng outputs in [0, 1)", () => {
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const rng = createRng(12345);
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const samples = Array.from({ length: 500 }, () => rng());
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for (const value of samples) {
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expect(value).toBeGreaterThanOrEqual(0);
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expect(value).toBeLessThan(1);
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}
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});
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it("matches a stable golden sequence for a fixed seed", () => {
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const rng = createRng(12345);
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const sequence = Array.from({ length: 5 }, () => rng());
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expect(sequence).toEqual([
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0.9797282677609473,
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0.3067522644996643,
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0.484205421525985,
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0.817934412509203,
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0.5094283693470061,
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]);
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});
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it("produces different sequences for different seeds", () => {
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const rngA = createRng(12345);
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const rngB = createRng(12346);
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const sequenceA = Array.from({ length: 5 }, () => rngA());
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const sequenceB = Array.from({ length: 5 }, () => rngB());
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expect(sequenceA).not.toEqual(sequenceB);
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});
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it("normalizes undefined, empty and non-numeric string to numbers", () => {
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expect(typeof normalizeSeed(undefined)).toBe("number");
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expect(typeof normalizeSeed("")).toBe("number");
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expect(typeof normalizeSeed("abc")).toBe("number");
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});
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it("normalizes edge case seeds into uint32 semantics", () => {
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expect(normalizeSeed(NaN)).toBe(0x9e3779b9);
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expect(normalizeSeed(-1)).toBe(0xffffffff);
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expect(normalizeSeed(1.9)).toBe(1);
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expect(normalizeSeed(" ")).toBe(0x9e3779b9);
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});
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});
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