Replaces raster.tests.js with new tests

Transforms the old rendering tests for the RasterSource
to the new rendering test approach.

test/rendering/ol/source/raster.test.js

@@ -1,83 +0,0 @@
-import Map from '../../../../src/ol/Map.js';
-import View from '../../../../src/ol/View.js';
-import ImageLayer from '../../../../src/ol/layer/Image.js';
-import RasterSource from '../../../../src/ol/source/Raster.js';
-import XYZ from '../../../../src/ol/source/XYZ.js';
-
-where('Uint8ClampedArray').describe('ol.rendering.source.Raster', function() {
-
-  function afterRender(source, raster, callback) {
-    let loading = 0;
-
-    source.on('tileloadstart', function(event) {
-      loading++;
-    });
-    source.on('tileloadend', function(event) {
-      loading--;
-      if (loading == 0) {
-        raster.once('afteroperations', function() {
-          callback();
-        });
-      }
-    });
-    source.on('tileloaderror', function(event) {
-      callback(new Error('Tile failed to load'));
-    });
-
-  }
-
-  let map;
-  function createMap(pixelRatio) {
-    map = new Map({
-      target: createMapDiv(200, 200),
-      pixelRatio: pixelRatio,
-      view: new View({
-        center: [0, 0],
-        zoom: 0
-      })
-    });
-  }
-
-  afterEach(function() {
-    if (map) {
-      disposeMap(map);
-    }
-    map = null;
-  });
-
-  describe('raster source rendering', function() {
-    it('renders the result of an operation', function(done) {
-      createMap(1);
-
-      const source = new XYZ({
-        url: 'rendering/ol/data/tiles/osm/{z}/{x}/{y}.png',
-        transition: 0
-      });
-
-      const raster = new RasterSource({
-        sources: [source],
-        operation: function(pixels) {
-          const pixel = pixels[0];
-          // swap blue and red
-          const red = pixel[0];
-          pixel[0] = pixel[2];
-          pixel[2] = red;
-          return pixel;
-        }
-      });
-
-      afterRender(source, raster, function(err) {
-        if (err) {
-          done(err);
-          return;
-        }
-        expectResemble(map, 'rendering/ol/source/expected/raster-1.png', IMAGE_TOLERANCE, done);
-      });
-
-      const layer = new ImageLayer({source: raster});
-
-      map.addLayer(layer);
-    });
-  });
-
-});