nodejs/test/parallel/test-util.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
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// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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'use strict';
// Flags: --expose-internals
const common = require('../common');
const assert = require('assert');
const util = require('util');
const errors = require('internal/errors');
const context = require('vm').runInNewContext;

// isArray
assert.strictEqual(util.isArray([]), true);
assert.strictEqual(util.isArray(Array()), true);
assert.strictEqual(util.isArray(new Array()), true);
assert.strictEqual(util.isArray(new Array(5)), true);
assert.strictEqual(util.isArray(new Array('with', 'some', 'entries')), true);
assert.strictEqual(util.isArray(context('Array')()), true);
assert.strictEqual(util.isArray({}), false);
assert.strictEqual(util.isArray({ push: function() {} }), false);
assert.strictEqual(util.isArray(/regexp/), false);
assert.strictEqual(util.isArray(new Error()), false);
assert.strictEqual(util.isArray({ __proto__: Array.prototype }), false);

// _extend
assert.deepStrictEqual(util._extend({ a: 1 }), { a: 1 });
assert.deepStrictEqual(util._extend({ a: 1 }, []), { a: 1 });
assert.deepStrictEqual(util._extend({ a: 1 }, null), { a: 1 });
assert.deepStrictEqual(util._extend({ a: 1 }, true), { a: 1 });
assert.deepStrictEqual(util._extend({ a: 1 }, false), { a: 1 });
assert.deepStrictEqual(util._extend({ a: 1 }, { b: 2 }), { a: 1, b: 2 });
assert.deepStrictEqual(util._extend({ a: 1, b: 2 }, { b: 3 }), { a: 1, b: 3 });

assert.strictEqual(util.toUSVString('string\ud801'), 'string\ufffd');

{
  assert.strictEqual(util.types.isNativeError(new Error()), true);
  assert.strictEqual(util.types.isNativeError(new TypeError()), true);
  assert.strictEqual(util.types.isNativeError(new SyntaxError()), true);
  assert.strictEqual(util.types.isNativeError(new (context('Error'))()), true);
  assert.strictEqual(
    util.types.isNativeError(new (context('TypeError'))()),
    true
  );
  assert.strictEqual(
    util.types.isNativeError(new (context('SyntaxError'))()),
    true
  );
  assert.strictEqual(util.types.isNativeError({}), false);
  assert.strictEqual(
    util.types.isNativeError({ name: 'Error', message: '' }),
    false
  );
  assert.strictEqual(util.types.isNativeError([]), false);
  assert.strictEqual(
    util.types.isNativeError({ __proto__: Error.prototype }),
    false
  );
  assert.strictEqual(
    util.types.isNativeError(new errors.codes.ERR_IPC_CHANNEL_CLOSED()),
    true
  );
}

assert.throws(() => {
  util.stripVTControlCharacters({});
}, {
  code: 'ERR_INVALID_ARG_TYPE',
  message: 'The "str" argument must be of type string.' +
           common.invalidArgTypeHelper({})
});