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import {
Snowflake,
InvalidEncodingError,
InvalidIDLengthError,
ID_BYTE_SIZE,
ALPHABET,
} from "../src/snowflake";
import { describe, it, expect } from "vitest";
describe("generate", () => {
it("New returns non-zero Snowflake", () => {
const s = Snowflake.generate();
expect(s.isZero()).toBe(false);
});
it("New returns unique IDs", () => {
const seen = new Set<string>();
for (let i = 0; i < 1000; i++) {
const s = Snowflake.generate();
const str = s.toString();
expect(seen.has(str)).toBe(false);
seen.add(str);
}
});
});
describe("zero", () => {
it("zero is zero", () => {
const z = Snowflake.zero();
expect(z.isZero()).toBe(true);
});
it("generated is not zero", () => {
const s = Snowflake.generate();
expect(s.isZero()).toBe(false);
});
});
describe("base62 round-trip", () => {
it("single round-trip", () => {
const original = Snowflake.generate();
const str = original.toString();
const parsed = Snowflake.fromString(str);
expect(parsed).toEqual(original);
});
it("many round-trips", () => {
for (let i = 0; i < 100; i++) {
const original = Snowflake.generate();
const str = original.toString();
const parsed = Snowflake.fromString(str);
expect(parsed).toEqual(original);
}
});
});
describe("base62 errors", () => {
it("invalid characters", () => {
expect(() => Snowflake.fromString("!!invalid!!")).toThrow(InvalidEncodingError);
});
it("empty string produces zero", () => {
const s = Snowflake.fromString("");
expect(s.isZero()).toBe(true);
});
it("too long string throws", () => {
const tooLong =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
expect(() => Snowflake.fromString(tooLong)).toThrow(InvalidEncodingError);
});
});
describe("zero stringification", () => {
it("zero stringifies to '0'", () => {
const z = Snowflake.zero();
expect(z.toString()).toBe("0");
});
it("zero round-trips", () => {
const z = Snowflake.zero();
const str = z.toString();
const parsed = Snowflake.fromString(str);
expect(parsed.isZero()).toBe(true);
});
});
describe("hex encoding", () => {
it("hex has correct length and characters", () => {
const s = Snowflake.generate();
const hex = s.toHex();
expect(hex.length).toBe(ID_BYTE_SIZE * 2);
expect(hex).toMatch(/^[0-9a-f]+$/);
});
it("hex round-trip", () => {
const original = Snowflake.generate();
const hex = original.toHex();
const parsed = Snowflake.fromHex(hex);
expect(parsed).toEqual(original);
});
it("invalid hex throws", () => {
expect(() => Snowflake.fromHex("xyz")).toThrow(InvalidEncodingError);
});
it("wrong length hex throws", () => {
expect(() => Snowflake.fromHex("01")).toThrow(InvalidIDLengthError);
});
});
describe("JSON serialization", () => {
it("toJSON returns base62 string", () => {
const s = Snowflake.generate();
const json = JSON.stringify(s);
const parsed = JSON.parse(json);
expect(parsed).toBe(s.toString());
});
it("fromJSON round-trip", () => {
const s = Snowflake.generate();
const json = JSON.stringify(s);
const parsed = Snowflake.fromJSON(json);
expect(parsed).toEqual(s);
});
it("fromJSON rejects missing quotes", () => {
expect(() => Snowflake.fromJSON("invalid")).toThrow(InvalidEncodingError);
});
it("fromJSON empty string produces zero", () => {
const s = Snowflake.fromJSON('""');
expect(s.isZero()).toBe(true);
});
it("fromJSON invalid inner content throws", () => {
expect(() => Snowflake.fromJSON('"!!!"')).toThrow(InvalidEncodingError);
});
});
describe("bytes", () => {
it("toBytes returns correct length", () => {
const s = Snowflake.generate();
const bytes = s.toBytes();
expect(bytes.length).toBe(ID_BYTE_SIZE);
});
it("fromBytes round-trip with Uint8Array", () => {
const original = Snowflake.generate();
const bytes = original.toBytes();
const parsed = Snowflake.fromBytes(bytes);
expect(parsed).toEqual(original);
});
it("fromBytes round-trip with string", () => {
const original = Snowflake.generate();
const bytes = original.toBytes();
const str = String.fromCharCode(...bytes);
const parsed = Snowflake.fromBytes(str);
expect(parsed).toEqual(original);
});
it("fromBytes nil-like (empty) throws", () => {
expect(() => Snowflake.fromBytes(new Uint8Array(0))).toThrow(InvalidIDLengthError);
});
it("fromBytes wrong length throws", () => {
expect(() => Snowflake.fromBytes(new Uint8Array([1, 2, 3]))).toThrow(InvalidIDLengthError);
});
it("fromBytes zero bytes produces zero", () => {
const zeroBytes = new Uint8Array(ID_BYTE_SIZE);
const s = Snowflake.fromBytes(zeroBytes);
expect(s.isZero()).toBe(true);
});
});
describe("JSON embedding", () => {
it("embedded in struct round-trips", () => {
const s = Snowflake.generate();
const wrapper = { name: "test", id: s, ref: s };
const data = JSON.stringify(wrapper);
const decoded = JSON.parse(data);
expect(decoded.id).toBe(s.toString());
expect(decoded.ref).toBe(s.toString());
});
});
describe("cross-encoding consistency", () => {
it("toString and toHex encode the same bytes", () => {
const s = Snowflake.generate();
const fromBase62 = Snowflake.fromString(s.toString());
const fromHex = Snowflake.fromHex(s.toHex());
expect(fromBase62.bytes).toEqual(fromHex.bytes);
});
});
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