node/test/simple/test-util.js

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var common = require('../common');
var assert = require('assert');
var util = require('util');
var context = require('vm').runInNewContext;

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

// isRegExp
assert.equal(true, util.isRegExp(/regexp/));
assert.equal(true, util.isRegExp(RegExp()));
assert.equal(true, util.isRegExp(new RegExp()));
assert.equal(true, util.isRegExp(context('RegExp')()));
assert.equal(false, util.isRegExp({}));
assert.equal(false, util.isRegExp([]));
assert.equal(false, util.isRegExp(new Date()));
assert.equal(false, util.isRegExp(Object.create(RegExp.prototype)));

// isDate
assert.equal(true, util.isDate(new Date()));
assert.equal(true, util.isDate(new Date(0)));
assert.equal(true, util.isDate(new (context('Date'))));
assert.equal(false, util.isDate(Date()));
assert.equal(false, util.isDate({}));
assert.equal(false, util.isDate([]));
assert.equal(false, util.isDate(new Error));
assert.equal(false, util.isDate(Object.create(Date.prototype)));

// isError
assert.equal(true, util.isError(new Error));
assert.equal(true, util.isError(new TypeError));
assert.equal(true, util.isError(new SyntaxError));
assert.equal(true, util.isError(new (context('Error'))));
assert.equal(true, util.isError(new (context('TypeError'))));
assert.equal(true, util.isError(new (context('SyntaxError'))));
assert.equal(false, util.isError({}));
assert.equal(false, util.isError({ name: 'Error', message: '' }));
assert.equal(false, util.isError([]));
assert.equal(true, util.isError(Object.create(Error.prototype)));

// isObject
assert.ok(util.isObject({}) === true);

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