node/test/simple/test-zlib-invalid-input.js

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// test uncompressing invalid input

var common = require('../common.js'),
    assert = require('assert'),
    zlib = require('zlib');

var nonStringInputs = [1, true, {a: 1}, ['a']];

console.error('Doing the non-strings');
nonStringInputs.forEach(function(input) {
  // zlib.gunzip should not throw an error when called with bad input.
  assert.doesNotThrow(function() {
    zlib.gunzip(input, function(err, buffer) {
      // zlib.gunzip should pass the error to the callback.
      assert.ok(err);
    });
  });
});

console.error('Doing the unzips');
// zlib.Unzip classes need to get valid data, or else they'll throw.
var unzips = [ zlib.Unzip(),
               zlib.Gunzip(),
               zlib.Inflate(),
               zlib.InflateRaw() ];
var hadError = [];
unzips.forEach(function (uz, i) {
  console.error('Error for '+uz.constructor.name);
  uz.on('error', function(er) {
    console.error('Error event', er);
    hadError[i] = true;

    // to be friendly to the Stream API, zlib objects just return true and
    // ignore data on the floor after an error.  It's up to the user to
    // catch the 'error' event and do something intelligent.  They do not
    // emit any more data, however.
    assert.equal(uz.write('also invalid'), true);
    assert.equal(uz.end(), true);
  });

  uz.on('end', function(er) {
    throw new Error('end event should not be emitted '+uz.constructor.name);
  });

  // this will trigger error event
  uz.write('this is not valid compressed data.');
});

process.on('exit', function() {
  assert.deepEqual(hadError, [true, true, true, true], 'expect 4 errors');
});