konva/test/unit/Context-test.js

suite('Context', function() {
  // ======================================================
  var contextMethods = [
    'clearRect',
    'fillRect',
    'strokeRect',
    'fillText',
    'strokeText',
    'measureText',
    'createLinearGradient',
    'createRadialGradient',
    'createPattern',
    'beginPath',
    'closePath',
    'moveTo',
    'lineTo',
    'bezierCurveTo',
    'quadraticCurveTo',
    'arc',
    'arcTo',
    'rect',
    'fill',
    'stroke',
    'clip',
    'isPointInPath',
    'scale',
    'rotate',
    'translate',
    'transform',
    'setTransform',
    'drawImage',
    'createImageData',
    'getImageData',
    'putImageData',
    'save',
    'restore'
  ];

  var contextProperties = [
    'fillStyle',
    'strokeStyle',
    'shadowColor',
    'shadowBlur',
    'shadowOffsetX',
    'shadowOffsetY',
    'lineCap',
    'lineDashOffset',
    'lineJoin',
    'lineWidth',
    'miterLimit',
    'font',
    'textAlign',
    'textBaseline',
    'globalAlpha',
    'globalCompositeOperation'
  ];

  test('context wrapper should work like native context', 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);

    var context = layer.getContext();
    var nativeContext = context._context;

    contextMethods.forEach(function(method) {
      assert.equal(
        typeof nativeContext[method],
        'function',
        'native context has no method ' + method
      );
      assert.equal(
        typeof context[method],
        'function',
        'context wrapper has no method ' + method
      );
    });

    contextProperties.forEach(function(prop) {
      assert.equal(
        nativeContext[prop] !== undefined,
        true,
        'native context has no property ' + prop
      );
      assert.equal(
        context[prop] !== undefined,
        true,
        'context wrapper has no property ' + prop
      );
    });

    // test get
    nativeContext.fillStyle = '#ff0000';
    assert.equal(context.fillStyle, '#ff0000');

    // test set
    context.globalAlpha = 0.5;
    assert.equal(context.globalAlpha, 0.5);
  });
});