socket.io/test/browser.js

const {
  encodePacket,
  encodePayload,
  decodePacket,
  decodePayload
} = require("..");
const expect = require("expect.js");
const { areArraysEqual, createArrayBuffer } = require("./util");

const withNativeArrayBuffer = typeof ArrayBuffer === "function";

describe("engine.io-parser (browser only)", () => {
  describe("single packet", () => {
    if (withNativeArrayBuffer) {
      it("should encode/decode an ArrayBuffer", done => {
        const packet = {
          type: "message",
          data: createArrayBuffer([1, 2, 3, 4])
        };
        encodePacket(packet, true, encodedPacket => {
          expect(encodedPacket).to.be.an(ArrayBuffer);
          expect(areArraysEqual(encodedPacket, packet.data)).to.be(true);
          const decodedPacket = decodePacket(encodedPacket, "arraybuffer");
          expect(decodedPacket.type).to.eql("message");
          expect(areArraysEqual(decodedPacket.data, packet.data)).to.be(true);
          done();
        });
      });

      it("should encode/decode an ArrayBuffer as base64", done => {
        const packet = {
          type: "message",
          data: createArrayBuffer([1, 2, 3, 4])
        };
        encodePacket(packet, false, encodedPacket => {
          expect(encodedPacket).to.eql("bAQIDBA==");
          const decodedPacket = decodePacket(encodedPacket, "arraybuffer");
          expect(decodedPacket.type).to.eql(packet.type);
          expect(decodedPacket.data).to.be.an(ArrayBuffer);
          expect(areArraysEqual(decodedPacket.data, packet.data)).to.be(true);
          done();
        });
      });

      it("should encode a typed array", done => {
        const data = new Int16Array(4);
        data[0] = 257;
        data[1] = 258;
        data[2] = 259;
        data[3] = 260;
        encodePacket({ type: "message", data }, true, encodedPacket => {
          expect(encodedPacket).to.be.an(ArrayBuffer);
          expect(
            areArraysEqual(
              encodedPacket,
              createArrayBuffer([1, 1, 2, 1, 3, 1, 4, 1])
            )
          ).to.be.ok();
          done();
        });
      });

      it("should encode a typed array (with offset and length)", done => {
        const buffer = createArrayBuffer([1, 2, 3, 4]);
        const data = new Int8Array(buffer, 1, 2);
        encodePacket({ type: "message", data }, true, encodedPacket => {
          expect(encodedPacket).to.be.an(ArrayBuffer);
          expect(encodedPacket).to.eql(createArrayBuffer([2, 4]));
          done();
        });
      });
    }

    if (typeof Blob === "function") {
      it("should encode/decode a Blob", done => {
        const packet = {
          type: "message",
          data: new Blob(["1234", createArrayBuffer([1, 2, 3, 4])])
        };
        encodePacket(packet, true, encodedPacket => {
          expect(encodedPacket).to.be.a(Blob);
          const decodedPacket = decodePacket(encodedPacket, "blob");
          expect(decodedPacket.type).to.eql("message");
          expect(decodedPacket.data).to.be.a(Blob);
          done();
        });
      });

      it("should encode/decode a Blob as base64", done => {
        const packet = {
          type: "message",
          data: new Blob(["1234", createArrayBuffer([1, 2, 3, 4])])
        };
        encodePacket(packet, false, encodedPacket => {
          expect(encodedPacket).to.eql("bMTIzNAECAwQ=");
          const decodedPacket = decodePacket(encodedPacket, "blob");
          expect(decodedPacket.type).to.eql("message");
          expect(decodedPacket.data).to.be.a(Blob);
          done();
        });
      });
    }
  });

  describe("payload", () => {
    if (withNativeArrayBuffer) {
      it("should encode/decode a string + ArrayBuffer payload", done => {
        const packets = [
          { type: "message", data: "test" },
          { type: "message", data: createArrayBuffer([1, 2, 3, 4]) }
        ];
        encodePayload(packets, payload => {
          expect(payload).to.eql("4test\x1ebAQIDBA==");
          expect(decodePayload(payload, "arraybuffer")).to.eql(packets);
          done();
        });
      });
    }
  });
});