public function test_it_clears_canvas()
 {
     $canvas = new Canvas(3, 2);
     $canvas->markPoint(2, 2);
     $canvas->clear();
     $canvasContent = $canvas->getContent();
     $this->assertEquals(Canvas::POINT_EMPTY, $canvasContent[2][2]);
 }
 private function clearCanvas()
 {
     $this->canvas->clear();
 }