zyuas.com/node_modules/defined/test/def.js

'use strict';

var defined = require('../');
var test = require('tape');

test('defined-or', function (t) {
	var u = void undefined;

	t.equal(defined(), u, 'empty arguments');
	t.equal(defined(u), u, '1 undefined');
	t.equal(defined(u, u), u, '2 undefined');
	t.equal(defined(u, u, u, u), u, '4 undefineds');

	t.equal(defined(undefined, false, true), false, 'false[0]');
	t.equal(defined(false, true), false, 'false[1]');
	t.equal(defined(undefined, 0, true), 0, 'zero[0]');
	t.equal(defined(0, true), 0, 'zero[1]');

	t.equal(defined(3, undefined, 4), 3, 'first arg');
	t.equal(defined(undefined, 3, 4), 3, 'second arg');
	t.equal(defined(undefined, undefined, 3), 3, 'third arg');

	t.end();
});