old_contents: describe('iD.svgLayers', function () {
      var context, container,
          projection = d3.geoProjection(function(x, y) { return [x, -y]; })
              .translate([0, 0])
              .scale(180 / Math.PI)
              .clipExtent([[0, 0], [Infinity, Infinity]]);
  
      beforeEach(function () {
          context = iD.Context();
          container = d3.select(document.createElement('div'));
      });
  
  
      it('creates a surface', function () {
          container.call(iD.svgLayers(projection, context));
          expect(container.selectAll('svg')).to.be.classed('surface');
      });
  
      it('creates surface defs', function () {
          container.call(iD.svgLayers(projection, context));
          var nodes = container.selectAll('svg defs').nodes();
          expect(nodes.length).to.eql(1);
          expect(d3.select(nodes[0])).to.be.classed('surface-defs');
      });
  
      it('creates default data layers', function () {
          container.call(iD.svgLayers(projection, context));
          var nodes = container.selectAll('svg .data-layer').nodes();
          expect(nodes.length).to.eql(5);
          expect(d3.select(nodes[0])).to.be.classed('data-layer-osm');
          expect(d3.select(nodes[1])).to.be.classed('data-layer-gpx');
          expect(d3.select(nodes[2])).to.be.classed('data-layer-mapillary-images');
          expect(d3.select(nodes[3])).to.be.classed('data-layer-mapillary-signs');
          expect(d3.select(nodes[4])).to.be.classed('data-layer-debug');
      });
  
  });
  
new_contents: describe('iD.svgLayers', function () {
      var context, container,
          projection = d3.geoProjection(function(x, y) { return [x, -y]; })
              .translate([0, 0])
              .scale(180 / Math.PI)
              .clipExtent([[0, 0], [Infinity, Infinity]]);
  
      beforeEach(function () {
          context = iD.Context();
          container = d3.select(document.createElement('div'));
      });
  
  
      it('creates a surface', function () {
          container.call(iD.svgLayers(projection, context));
          expect(container.selectAll('svg')).to.be.classed('surface');
      });
  
      it('creates surface defs', function () {
          container.call(iD.svgLayers(projection, context));
          var nodes = container.selectAll('svg defs').nodes();
          expect(nodes.length).to.eql(1);
          expect(d3.select(nodes[0])).to.be.classed('surface-defs');
      });
  
      it('creates default data layers', function () {
          container.call(iD.svgLayers(projection, context));
          var nodes = container.selectAll('svg .data-layer').nodes();
          expect(nodes.length).to.eql(6);
          expect(d3.select(nodes[0])).to.be.classed('data-layer-osm');
          expect(d3.select(nodes[1])).to.be.classed('data-layer-gpx');
          expect(d3.select(nodes[2])).to.be.classed('data-layer-hoot');
          expect(d3.select(nodes[3])).to.be.classed('data-layer-mapillary-images');
          expect(d3.select(nodes[4])).to.be.classed('data-layer-mapillary-signs');
          expect(d3.select(nodes[5])).to.be.classed('data-layer-debug');
      });
  
  });
  
subject: fix a test