Add regression test

test/spec/ol/renderer/canvas/imagelayer.test.js

@@ -0,0 +1,65 @@
+goog.require('ol.Map');
+goog.require('ol.View');
+goog.require('ol.layer.Image');
+goog.require('ol.proj.Projection');
+goog.require('ol.source.ImageStatic');
+
+
+describe('ol.renderer.canvas.ImageLayer', function() {
+
+  describe('#forEachLayerAtCoordinate', function() {
+
+    var map, target, source;
+    beforeEach(function(done) {
+      var projection = new ol.proj.Projection({
+        code: 'custom-image',
+        units: 'pixels',
+        extent: [0, 0, 200, 200]
+      });
+      target = document.createElement('div');
+      target.style.width = '100px';
+      target.style.height = '100px';
+      document.body.appendChild(target);
+      source = new ol.source.ImageStatic({
+        url: 'spec/ol/data/dot.png',
+        projection: projection,
+        imageExtent: [0, 0, 20, 20]
+      });
+      map = new ol.Map({
+        pixelRatio: 1,
+        target: target,
+        layers: [new ol.layer.Image({
+          source: source
+        })],
+        view: new ol.View({
+          projection: projection,
+          center: [10, 10],
+          zoom: 2,
+          maxZoom: 8
+        })
+      });
+      source.on('imageloadend', function() {
+        done();
+      });
+    });
+
+    afterEach(function() {
+      map.setTarget(null);
+      document.body.removeChild(target);
+    });
+
+    it('properly detects pixels', function() {
+      map.renderSync();
+      var has = false;
+      function hasLayer() {
+        has = true;
+      }
+      map.forEachLayerAtPixel([20, 80], hasLayer);
+      expect(has).to.be(true);
+      has = false;
+      map.forEachLayerAtPixel([10, 90], hasLayer);
+      expect(has).to.be(false);
+    });
+  });
+
+});