konva/test/unit/BaseLayer-test.js

suite('BaseLayer', function () {
  // ======================================================
  test('width and height', function () {
    Konva.showWarnings = false;
    var stage = addStage();

    var layer = new Konva.FastLayer();
    assert.equal(
      layer.width(),
      undefined,
      'while layer is not on stage width is undefined'
    );
    assert.equal(
      layer.height(),
      undefined,
      'while layer is not on stage height is undefined'
    );

    layer.width(10);
    assert.equal(
      layer.width(),
      undefined,
      'while layer is not on stage changing width doing nothing'
    );
    layer.height(10);
    assert.equal(
      layer.height(),
      undefined,
      'while layer is not on stage changing height doing nothing'
    );
    stage.add(layer);

    assert.equal(
      layer.width(),
      stage.width(),
      'while layer is on stage width is stage`s width'
    );
    assert.equal(
      layer.height(),
      stage.height(),
      'while layer is on stage height is stage`s height'
    );

    layer.width(10);
    assert.equal(
      layer.width(),
      stage.width(),
      'while layer is on stage changing width doing nothing'
    );
    layer.height(10);
    assert.equal(
      layer.height(),
      stage.height(),
      'while layer is on stage changing height doing nothing'
    );
    Konva.showWarnings = true;
  });
});