var assert = require('assert');

var snabbdom = require('../snabbdom');
var h = require('../h').default;
var patch = snabbdom.init([
  require('../modules/attributes').default
]);

describe('svg', function () {
  var elm, vnode0;
  beforeEach(function() {
    elm = document.createElement('svg');
    vnode0 = elm;
  });

  it('removes child svg elements', function(){
    var a = h('svg', {}, [
    h('g'),
    h('g')
    ]);
    var b = h('svg', {}, [
    h('g')
    ]);
    var result = patch(patch(vnode0, a), b).elm;
    assert.equal(result.childNodes.length, 1); 
  });

  it('adds correctly xlink namespaced attribute', function(){
    var xlinkNS = 'http://www.w3.org/1999/xlink';
    var testUrl = '/test';
    var a = h('svg', {}, [
      h('use', {
        attrs: { 'xlink:href': testUrl }
      }, [])
    ]);

    var result = patch(vnode0, a).elm;
    assert.equal(result.childNodes.length, 1);
    assert.equal(result.childNodes[0].getAttribute('xlink:href'), testUrl); 
    assert.equal(result.childNodes[0].getAttributeNS(xlinkNS,'href'), testUrl);

  });

  it('adds correctly xml namespaced attribute', function(){
    var xmlNS = 'http://www.w3.org/XML/1998/namespace';
    var testAttrValue = 'und';
    var a = h('svg', { attrs: { 'xml:lang': testAttrValue } }, []);

    var result = patch(vnode0, a).elm;
    assert.equal(result.getAttributeNS(xmlNS, 'lang'), testAttrValue);
    assert.equal(result.getAttribute('xml:lang'), testAttrValue); 
  });
})