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

describe('nAry', function() {
  function toArray(args) { return Array.prototype.slice.call(args, 0); }
  it('turns multiple-argument function into a nullary one', function() {    var fn = R.nAry(0, function(x, y, z) { void z; return toArray(arguments); });    eq(fn.length, 0);    eq(fn(1, 2, 3), []);  });
  it('turns multiple-argument function into a ternary one', function() {    var fn = R.nAry(3, function(a, b, c, d) { void d; return toArray(arguments); });    eq(fn.length, 3);    eq(fn(1, 2, 3, 4), [1, 2, 3]);    eq(fn(1), [1, undefined, undefined]);  });
  it('creates functions of arity less than or equal to ten', function() {    var fn = R.nAry(10, function() { return toArray(arguments); });    eq(fn.length, 10);    eq(fn.apply(null, R.range(0, 25)), R.range(0, 10));
    var undefs = fn();    var ns = R.repeat(undefined, 10);    eq(undefs.length, ns.length);    var idx = undefs.length - 1;    while (idx >= 0) {      eq(undefs[idx], ns[idx]);      idx -= 1;    }  });
  it('throws if n is greater than ten', function() {    assert.throws(function() {      R.nAry(11, function() {});    }, function(err) {      return (err instanceof Error &&              err.message === 'First argument to nAry must be a non-negative integer no greater than ten');    });  });
});