log4js-node/test/tap/server-test.js

const { test } = require("tap");
const net = require("net");
const log4js = require("../../lib/log4js");
const vcr = require("../../lib/appenders/recording");
const levels = require("../../lib/levels");
const LoggingEvent = require("../../lib/LoggingEvent");

log4js.configure({
  appenders: {
    vcr: { type: "recording" },
    tcp: { type: "tcp-server", port: 5678 }
  },
  categories: {
    default: { appenders: ["vcr"], level: "debug" }
  }
});

// give the socket a chance to start up
test("TCP Server", batch => {
  batch.test(
    "should listen for TCP messages and re-send via process.send",
    t => {
      setTimeout(() => {
        const socket = net.connect(5678, () => {
          socket.write(
            `${new LoggingEvent(
              "test-category",
              levels.INFO,
              ["something"],
              {}
            ).serialise()}__LOG4JS__${new LoggingEvent(
              "test-category",
              levels.INFO,
              ["something else"],
              {}
            ).serialise()}__LOG4JS__some nonsense__LOG4JS__{"some":"json"}__LOG4JS__`,
            () => {
              socket.end();
              setTimeout(() => {
                log4js.shutdown(() => {
                  const logs = vcr.replay();
                  t.equal(logs.length, 4);
                  t.match(logs[0], {
                    data: ["something"],
                    categoryName: "test-category",
                    level: { levelStr: "INFO" },
                    context: {}
                  });
                  t.match(logs[1], {
                    data: ["something else"],
                    categoryName: "test-category",
                    level: { levelStr: "INFO" },
                    context: {}
                  });
                  t.match(logs[2], {
                    data: [
                      "Unable to parse log:",
                      "some nonsense",
                      "because: ",
                      SyntaxError
                    ],
                    categoryName: "log4js",
                    level: { levelStr: "ERROR" },
                    context: {}
                  });
                  t.match(logs[3], {
                    data: [
                      "Unable to parse log:",
                      '{"some":"json"}',
                      "because: ",
                      TypeError
                    ],
                    categoryName: "log4js",
                    level: { levelStr: "ERROR" },
                    context: {}
                  });
                  t.end();
                });
              }, 100);
            }
          );
        });

        socket.unref();
      }, 100);

      batch.end();
    }
  );
});