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

describe('mergeWith', function() {  function last(x, y) { return y; }
  it('takes two objects, merges their own properties and returns a new object', function() {    var a = {w: 1, x: 2};    var b = {y: 3, z: 4};    eq(R.mergeWith(last, a, b), {w: 1, x: 2, y: 3, z: 4});  });
  it('applies the provided function to the value from the first object and the' +    ' value from the second object to determine the value for keys that exist in' +    ' both objects', function() {    var a = {x: 'a', y: 'c'};    var b = {x: 'b', z: 'd'};    var c = R.mergeWith(function(a, b) { return a + b; }, a, b);    eq(c, {x: 'ab', y: 'c', z: 'd'});  });
  it('is not destructive', function() {    var a = {w: 1, x: 2};    var res = R.mergeWith(last, a, {x: 5});    assert.notStrictEqual(a, res);    eq(res, {w: 1, x: 5});  });
  it('reports only own properties', function() {    function Cla() {}    Cla.prototype.x = 5;    eq(R.mergeWith(last, new Cla(), {w: 1, x: 2}), {w: 1, x: 2});    eq(R.mergeWith(last, {w: 1, x: 2}, new Cla()), {w: 1, x: 2});    eq(R.mergeWith(last, new Cla(), {w: 1}), {w: 1});  });
});