public function testIfGetNumberOfPointsWorksAsExpected()
{
$polygon = new Polygon();
$this->assertEquals(0, $polygon->getNumberOfPoints());
$polygon->addPoint(new Coordinate(10, 10));
$this->assertEquals(1, $polygon->getNumberOfPoints());
$polygon->addPoint(new Coordinate(10, 20));
$this->assertEquals(2, $polygon->getNumberOfPoints());
}