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// kind of hand-written fuzzing data// any errors should not break Encoder/Decoder instance statesimport assert from "assert";import { encode, decodeAsync, decode, Encoder, Decoder, decodeMulti, decodeMultiStream } from "../src";import { DataViewIndexOutOfBoundsError } from "../src/Decoder";
function testEncoder(encoder: Encoder): void {  const object = {    foo: 1,    bar: 2,    baz: ["one", "two", "three"],  };  assert.deepStrictEqual(decode(encoder.encode(object)), object);}
function testDecoder(decoder: Decoder): void {  const object = {    foo: 1,    bar: 2,    baz: ["one", "two", "three"],  };  assert.deepStrictEqual(decoder.decode(encode(object)), object);}
describe("edge cases", () => {  context("try to encode cyclic refs", () => {    it("throws errors on arrays", () => {      const encoder = new Encoder();      const cyclicRefs: Array<any> = [];      cyclicRefs.push(cyclicRefs);      assert.throws(() => {        encoder.encode(cyclicRefs);      }, /too deep/i);      testEncoder(encoder);    });
    it("throws errors on objects", () => {      const encoder = new Encoder();      const cyclicRefs: Record<string, any> = {};      cyclicRefs["foo"] = cyclicRefs;      assert.throws(() => {        encoder.encode(cyclicRefs);      }, /too deep/i);      testEncoder(encoder);    });  });
  context("try to encode unrecognized objects", () => {    it("throws errors", () => {      const encoder = new Encoder();      assert.throws(() => {        encode(() => {});      }, /unrecognized object/i);      testEncoder(encoder);    });  });
  context("try to decode a map with non-string keys (asynchronous)", () => {    it("throws errors", async () => {      const decoder = new Decoder();      const createStream = async function* () {        yield [0x81]; // fixmap size=1        yield encode(null);        yield encode(null);      };
      await assert.rejects(async () => {        await decoder.decodeAsync(createStream());      }, /The type of key must be string/i);      testDecoder(decoder);    });  });
  context("try to decode invalid MessagePack binary", () => {    it("throws errors", () => {      const decoder = new Decoder();      const TYPE_NEVER_USED = 0xc1;
      assert.throws(() => {        decoder.decode([TYPE_NEVER_USED]);      }, /unrecognized type byte/i);      testDecoder(decoder);    });  });
  context("try to decode insufficient data", () => {    it("throws errors (synchronous)", () => {      const decoder = new Decoder();      assert.throws(() => {        decoder.decode([          0x92, // fixarray size=2          0xc0, // nil        ]);        // [IE11] A raw error thrown by DataView      }, DataViewIndexOutOfBoundsError);      testDecoder(decoder);    });
    it("throws errors (asynchronous)", async () => {      const decoder = new Decoder();      const createStream = async function* () {        yield [0x92]; // fixarray size=2        yield encode(null);      };
      await assert.rejects(async () => {        await decoder.decodeAsync(createStream());      }, RangeError);      testDecoder(decoder);    });  });
  context("try to decode data with extra bytes", () => {    it("throws errors (synchronous)", () => {      const decoder = new Decoder();      assert.throws(() => {        decoder.decode([          0x90, // fixarray size=0          ...encode(null),        ]);      }, RangeError);      testDecoder(decoder);    });
    it("throws errors (asynchronous)", async () => {      const decoder = new Decoder();      const createStream = async function* () {        yield [0x90]; // fixarray size=0        yield encode(null);      };
      await assert.rejects(async () => {        await decoder.decodeAsync(createStream());      }, RangeError);      testDecoder(decoder);    });
    it("throws errors (asynchronous)", async () => {      const decoder = new Decoder();      const createStream = async function* () {        yield [0x90, ...encode(null)]; // fixarray size=0 + nil      };
      await assert.rejects(async () => {        await decoder.decodeAsync(createStream());      }, RangeError);      testDecoder(decoder);    });  });
  context("try to decode an empty input", () => {    it("throws RangeError (synchronous)", () => {      assert.throws(() => {        decode([]);      }, RangeError);    });
    it("decodes an empty array with decodeMulti()", () => {      assert.deepStrictEqual([...decodeMulti([])], []);    });
    it("throws RangeError (asynchronous)", async () => {      const createStream = async function* () {        yield [];      };
      assert.rejects(async () => {        await decodeAsync(createStream());      }, RangeError);    });
    it("decodes an empty array with decodeMultiStream()", async () => {      const createStream = async function* () {        yield [];      };
      const results: Array<unknown> = [];      for await (const item of decodeMultiStream(createStream())) {        results.push(item);      }      assert.deepStrictEqual(results, []);    });  });});