refactor tests

test/unit/Canvas-test.ts

@@ -0,0 +1,42 @@
+import { assert } from 'chai';
+import { addStage, Konva } from './utis';
+
+describe('Canvas', function () {
+  // ======================================================
+  it('pixel ratio', function () {
+    var stage = addStage();
+
+    var layer = new Konva.Layer();
+
+    var circle = new Konva.Circle({
+      x: 100,
+      y: 70,
+      radius: 70,
+      fill: 'green',
+      stroke: 'blue',
+      strokeWidth: 4,
+      draggable: true,
+    });
+
+    layer.add(circle);
+    stage.add(layer);
+
+    stage.width(578 / 2);
+    stage.height(100);
+
+    stage.draw();
+    assert.equal(layer.getCanvas().getPixelRatio(), Konva.pixelRatio);
+
+    layer.getCanvas().setPixelRatio(1);
+    assert.equal(layer.getCanvas().getPixelRatio(), 1);
+    assert.equal(layer.getCanvas().width, 289);
+    assert.equal(layer.getCanvas().height, 100);
+
+    layer.getCanvas().setPixelRatio(2);
+    assert.equal(layer.getCanvas().getPixelRatio(), 2);
+    assert.equal(layer.getCanvas().width, 578);
+    assert.equal(layer.getCanvas().height, 200);
+
+    layer.draw();
+  });
+});