/**
  * @dataProvider shapesDataProvider
  * @param $shapeArray
  * @param $assertions
  */
 public function testClearShapes($shapeArray, $assertions)
 {
     $exercise = new MatchPictureInPictureExercise();
     $this->assertNull($exercise->addShapesFromArray($shapeArray));
     // Test clearShapes()
     $exercise->clearShapes();
     $this->assertSame(0, count($exercise->getShapes()));
 }