mergeAll.js

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


describe('mergeAll', function() {
  it('merges a list of objects together into one object', function() {
    eq(R.mergeAll([{foo:1}, {bar:2}, {baz:3}]), {foo:1, bar:2, baz:3});
  });

  it('gives precedence to later objects in the list', function() {
    eq(R.mergeAll([{foo:1}, {foo:2}, {bar:2}]), {foo:2, bar:2});
  });

  it('ignores inherited properties', function() {
    function Foo() {}
    Foo.prototype.bar = 42;
    var foo = new Foo();
    var res = R.mergeAll([foo, {fizz: 'buzz'}]);
    eq(res, {fizz: 'buzz'});
  });

  describe('acts as if nil values are simply empty objects', function() {
    it('... if the first object is nil', function() {
      eq(R.mergeAll([null, {foo:1}, {foo:2}, {bar:2}]), {foo:2, bar:2});
    });
    it('... if the last object is nil', function() {
      eq(R.mergeAll([{foo:1}, {foo:2}, {bar:2}, undefined]), {foo:2, bar:2});
    });
    it('... if an intermediate object is nil', function() {
      eq(R.mergeAll([{foo:1}, {foo:2}, null, {bar:2}]), {foo:2, bar:2});
    });
  });

});