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var assert = require('assert');
var R = require('../source');var eq = require('./shared/eq');

describe('constructN', function() {  var Circle = function(r) {    this.r = r;    this.colors = Array.prototype.slice.call(arguments, 1);  };  Circle.prototype.area = function() {return Math.PI * Math.pow(this.r, 2);};
  it('turns a constructor function into a function with n arguments', function() {    var circle = R.constructN(2, Circle);    var c1 = circle(1, 'red');    eq(c1.constructor, Circle);    eq(c1.r, 1);    eq(c1.area(), Math.PI);    eq(c1.colors, ['red']);
    var regex = R.constructN(1, RegExp);    var pattern = regex('[a-z]');    eq(pattern.constructor, RegExp);    eq(pattern.source, '[a-z]');  });
  it('can be used to create Date object', function() {    var date = R.constructN(3, Date)(1984, 3, 26);    eq(date.constructor, Date);    eq(date.getFullYear(), 1984);  });
  it('supports constructors with no arguments', function() {    function Foo() {}    var foo = R.constructN(0, Foo)();    eq(foo.constructor, Foo);  });
  it('does not support constructor with greater than ten arguments', function() {    assert.throws(function() {      function Foo($0, $1, $2, $3, $4, $5, $6, $7, $8, $9, $10) {        this.eleventh = $10;      }      R.constructN(11, Foo);    }, function(err) {      return (err instanceof Error &&              err.message === 'Constructor with greater than ten arguments');    });  });
});