text: goog.provide('ol.test.source.XYZ');
  
  
  describe('ol.source.XYZ', function() {
  
    describe('constructor', function() {
  
      it('can be constructed with a custom tile grid', function() {
        var tileGrid = ol.tilegrid.createXYZ();
        var tileSource = new ol.source.XYZ({
          tileGrid: tileGrid
        });
        expect(tileSource.getTileGrid()).to.be(tileGrid);
      });
  
      it('can be constructed with a custom tile size', function() {
        var tileSource = new ol.source.XYZ({
          tileSize: 512
        });
        expect(tileSource.getTileGrid().getTileSize(0)).to.be(512);
      });
  
    });
  
    describe('tileUrlFunction', function() {
  
      var xyzTileSource, tileGrid;
  
      beforeEach(function() {
        xyzTileSource = new ol.source.XYZ({
          maxZoom: 6,
          url: '{z}/{x}/{y}'
        });
        tileGrid = xyzTileSource.getTileGrid();
      });
  
      it('returns the expected URL', function() {
  
        var coordinate = [829330.2064098881, 5933916.615134273];
        var tileUrl;
  
        tileUrl = xyzTileSource.tileUrlFunction(
            tileGrid.getTileCoordForCoordAndZ(coordinate, 0));
        expect(tileUrl).to.eql('0/0/0');
  
        tileUrl = xyzTileSource.tileUrlFunction(
            tileGrid.getTileCoordForCoordAndZ(coordinate, 1));
        expect(tileUrl).to.eql('1/1/0');
  
        tileUrl = xyzTileSource.tileUrlFunction(
            tileGrid.getTileCoordForCoordAndZ(coordinate, 2));
        expect(tileUrl).to.eql('2/2/1');
  
        tileUrl = xyzTileSource.tileUrlFunction(
            tileGrid.getTileCoordForCoordAndZ(coordinate, 3));
        expect(tileUrl).to.eql('3/4/2');
  
        tileUrl = xyzTileSource.tileUrlFunction(
            tileGrid.getTileCoordForCoordAndZ(coordinate, 4));
        expect(tileUrl).to.eql('4/8/5');
  
        tileUrl = xyzTileSource.tileUrlFunction(
            tileGrid.getTileCoordForCoordAndZ(coordinate, 5));
        expect(tileUrl).to.eql('5/16/11');
  
        tileUrl = xyzTileSource.tileUrlFunction(
            tileGrid.getTileCoordForCoordAndZ(coordinate, 6));
        expect(tileUrl).to.eql('6/33/22');
  
      });
  
      describe('wrap x', function() {
  
        it('returns the expected URL', function() {
          var projection = xyzTileSource.getProjection();
          var tileUrl = xyzTileSource.tileUrlFunction(
              xyzTileSource.getTileCoordForTileUrlFunction(
                  [6, -31, -23], projection));
          expect(tileUrl).to.eql('6/33/22');
  
          tileUrl = xyzTileSource.tileUrlFunction(
              xyzTileSource.getTileCoordForTileUrlFunction(
                  [6, 33, -23], projection));
          expect(tileUrl).to.eql('6/33/22');
  
          tileUrl = xyzTileSource.tileUrlFunction(
              xyzTileSource.getTileCoordForTileUrlFunction(
                  [6, 97, -23], projection));
          expect(tileUrl).to.eql('6/33/22');
        });
  
      });
  
      describe('crop y', function() {
  
        it('returns the expected URL', function() {
          var projection = xyzTileSource.getProjection();
          var tileUrl = xyzTileSource.tileUrlFunction(
              xyzTileSource.getTileCoordForTileUrlFunction(
                  [6, 33, 0], projection));
          expect(tileUrl).to.be(undefined);
  
          tileUrl = xyzTileSource.tileUrlFunction(
              xyzTileSource.getTileCoordForTileUrlFunction(
                  [6, 33, -23], projection));
          expect(tileUrl).to.eql('6/33/22');
  
          tileUrl = xyzTileSource.tileUrlFunction(
              xyzTileSource.getTileCoordForTileUrlFunction(
                  [6, 33, -65], projection));
          expect(tileUrl).to.be(undefined);
        });
  
      });
  
    });
  
    describe('#getUrls', function() {
  
      var sourceOptions;
      var source;
      var url = 'http://geo.nls.uk/maps/towns/glasgow1857/{z}/{x}/{-y}.png';
  
      beforeEach(function() {
        sourceOptions = {
          projection: 'EPSG:4326'
        };
      });
  
      describe('using a "url" option', function() {
        beforeEach(function() {
          sourceOptions.url = url;
          source = new ol.source.XYZ(sourceOptions);
        });
  
        it('returns the XYZ URL', function() {
          var urls = source.getUrls();
          expect(urls).to.be.eql([url]);
        });
  
      });
  
      describe('using a "urls" option', function() {
        beforeEach(function() {
          sourceOptions.urls = ['some_xyz_url1', 'some_xyz_url2'];
          source = new ol.source.XYZ(sourceOptions);
        });
  
        it('returns the XYZ URLs', function() {
          var urls = source.getUrls();
          expect(urls).to.be.eql(['some_xyz_url1', 'some_xyz_url2']);
        });
  
      });
  
      describe('using a "tileUrlFunction"', function() {
        beforeEach(function() {
          sourceOptions.tileUrlFunction = function() {
            return 'some_xyz_url';
          };
          source = new ol.source.XYZ(sourceOptions);
        });
  
        it('returns null', function() {
          var urls = source.getUrls();
          expect(urls).to.be(null);
        });
  
      });
  
    });
  
  });
  
  goog.require('ol.TileCoord');
  goog.require('ol.source.XYZ');
  