node/test/parallel/test-fs-read-stream-err.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
const common = require('../common');
const assert = require('assert');
const fs = require('fs');

const stream = fs.createReadStream(__filename, {
  bufferSize: 64
});
const err = new Error('BAM');

stream.on('error', common.mustCall((err_) => {
  process.nextTick(common.mustCall(() => {
    assert.strictEqual(stream.fd, null);
    assert.strictEqual(err_, err);
  }));
}));

fs.close = common.mustCall((fd_, cb) => {
  assert.strictEqual(fd_, stream.fd);
  process.nextTick(cb);
});

const read = fs.read;
fs.read = function() {
  // First time is ok.
  read.apply(fs, arguments);
  // Then it breaks.
  fs.read = common.mustCall(function() {
    const cb = arguments[arguments.length - 1];
    process.nextTick(() => {
      cb(err);
    });
    // It should not be called again!
    fs.read = () => {
      throw new Error('BOOM!');
    };
  });
};

stream.on('data', (buf) => {
  stream.on('data', common.mustNotCall("no more 'data' events should follow"));
});