Organize tests

test/browser/spec/ol/render.test.js

@@ -0,0 +1,44 @@
+import CanvasImmediateRenderer from '../../../../src/ol/render/canvas/Immediate.js';
+import {DEVICE_PIXEL_RATIO} from '../../../../src/ol/has.js';
+import {
+  create as createTransform,
+  scale as scaleTransform,
+} from '../../../../src/ol/transform.js';
+import {equals} from '../../../../src/ol/array.js';
+import {toContext} from '../../../../src/ol/render.js';
+
+describe('ol.render', function () {
+  describe('toContext', function () {
+    it('creates an ol.render.canvas.Immediate and sets defaults', function () {
+      const canvas = document.createElement('canvas');
+      const render = toContext(canvas.getContext('2d'));
+      expect(render).to.be.a(CanvasImmediateRenderer);
+      expect(render.pixelRatio_).to.be(DEVICE_PIXEL_RATIO);
+    });
+
+    it('sets size and pixel ratio from options', function () {
+      const canvas = document.createElement('canvas');
+      const pixelRatio = 1.5;
+      const size = [100, 50];
+      const render = toContext(canvas.getContext('2d'), {
+        pixelRatio: pixelRatio,
+        size: size,
+      });
+      expect(render.pixelRatio_).to.be(pixelRatio);
+      expect(render.extent_).to.eql([
+        0,
+        0,
+        size[0] * pixelRatio,
+        size[1] * pixelRatio,
+      ]);
+      expect(canvas.style.width).to.be(size[0] + 'px');
+      expect(canvas.style.height).to.be(size[1] + 'px');
+      const transform = scaleTransform(
+        createTransform(),
+        pixelRatio,
+        pixelRatio
+      );
+      expect(equals(render.transform_, transform)).to.be.ok();
+    });
+  });
+});