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import assert from "assert";import util from "util";import { encode, decode, ExtensionCodec, decodeAsync } from "../src";
describe("ExtensionCodec", () => {  context("timestamp", () => {    const extensionCodec = ExtensionCodec.defaultCodec;
    it("encodes and decodes a date without milliseconds (timestamp 32)", () => {      const date = new Date(1556633024000);      const encoded = encode(date, { extensionCodec });      assert.deepStrictEqual(        decode(encoded, { extensionCodec }),        date,        `date: ${date.toISOString()}, encoded: ${util.inspect(encoded)}`,      );    });
    it("encodes and decodes a date with milliseconds (timestamp 64)", () => {      const date = new Date(1556633024123);      const encoded = encode(date, { extensionCodec });      assert.deepStrictEqual(        decode(encoded, { extensionCodec }),        date,        `date: ${date.toISOString()}, encoded: ${util.inspect(encoded)}`,      );    });
    it("encodes and decodes a future date (timestamp 96)", () => {      const date = new Date(0x400000000 * 1000);      const encoded = encode(date, { extensionCodec });      assert.deepStrictEqual(        decode(encoded, { extensionCodec }),        date,        `date: ${date.toISOString()}, encoded: ${util.inspect(encoded)}`,      );    });  });
  context("custom extensions", () => {    const extensionCodec = new ExtensionCodec();
    // Set<T>    extensionCodec.register({      type: 0,      encode: (object: unknown): Uint8Array | null => {        if (object instanceof Set) {          return encode([...object]);        } else {          return null;        }      },      decode: (data: Uint8Array) => {        const array = decode(data) as Array<unknown>;        return new Set(array);      },    });
    // Map<T>    extensionCodec.register({      type: 1,      encode: (object: unknown): Uint8Array | null => {        if (object instanceof Map) {          return encode([...object]);        } else {          return null;        }      },      decode: (data: Uint8Array) => {        const array = decode(data) as Array<[unknown, unknown]>;        return new Map(array);      },    });
    it("encodes and decodes custom data types (synchronously)", () => {      const set = new Set([1, 2, 3]);      const map = new Map([        ["foo", "bar"],        ["bar", "baz"],      ]);      const encoded = encode([set, map], { extensionCodec });      assert.deepStrictEqual(decode(encoded, { extensionCodec }), [set, map]);    });
    it("encodes and decodes custom data types (asynchronously)", async () => {      const set = new Set([1, 2, 3]);      const map = new Map([        ["foo", "bar"],        ["bar", "baz"],      ]);      const encoded = encode([set, map], { extensionCodec });      const createStream = async function* () {        yield encoded;      };      assert.deepStrictEqual(await decodeAsync(createStream(), { extensionCodec }), [set, map]);    });  });
  context("custom extensions with custom context", () => {    class Context {      public expectations: Array<any> = [];      constructor(public ctxVal: number) {}      public hasVisited(val: any) {        this.expectations.push(val);      }    }    const extensionCodec = new ExtensionCodec<Context>();
    class Magic<T> {      constructor(public val: T) {}    }
    // Magic    extensionCodec.register({      type: 0,      encode: (object: unknown, context): Uint8Array | null => {        if (object instanceof Magic) {          context.hasVisited({ encoding: object.val });          return encode({ magic: object.val, ctx: context.ctxVal }, { extensionCodec, context });        } else {          return null;        }      },      decode: (data: Uint8Array, extType, context) => {        extType;        const decoded = decode(data, { extensionCodec, context }) as { magic: number };        context.hasVisited({ decoding: decoded.magic, ctx: context.ctxVal });        return new Magic(decoded.magic);      },    });
    it("encodes and decodes custom data types (synchronously)", () => {      const context = new Context(42);      const magic1 = new Magic(17);      const magic2 = new Magic({ foo: new Magic("inner") });      const test = [magic1, magic2];      const encoded = encode(test, { extensionCodec, context });      assert.deepStrictEqual(decode(encoded, { extensionCodec, context }), test);      assert.deepStrictEqual(context.expectations, [        {          encoding: magic1.val,        },        {          encoding: magic2.val,        },        {          encoding: magic2.val.foo.val,        },        {          ctx: 42,          decoding: magic1.val,        },        {          ctx: 42,          decoding: magic2.val.foo.val,        },        {          ctx: 42,          decoding: magic2.val,        },      ]);    });
    it("encodes and decodes custom data types (asynchronously)", async () => {      const context = new Context(42);      const magic1 = new Magic(17);      const magic2 = new Magic({ foo: new Magic("inner") });      const test = [magic1, magic2];      const encoded = encode(test, { extensionCodec, context });      const createStream = async function* () {        yield encoded;      };      assert.deepStrictEqual(await decodeAsync(createStream(), { extensionCodec, context }), test);      assert.deepStrictEqual(context.expectations, [        {          encoding: magic1.val,        },        {          encoding: magic2.val,        },        {          encoding: magic2.val.foo.val,        },        {          ctx: 42,          decoding: magic1.val,        },        {          ctx: 42,          decoding: magic2.val.foo.val,        },        {          ctx: 42,          decoding: magic2.val,        },      ]);    });  });});