private function fractionAlongLine()
{
$point1 = new Point([5, 10]);
$point2 = new Point([15, 10]);
$fraction02 = $point1->getFractionAlongLineTo($point2, 0.2);
$fraction05 = $point1->getFractionAlongLineTo($point2, 0.5);
$midpoint = $point1->getMidpoint($point2);
$this->assertEquals(6.9998522347268, $fraction02->getLongitude());
$this->assertEquals(10.023944943799, $fraction02->getLatitude());
$this->assertEquals($midpoint->getLatitude(), $fraction05->getLatitude());
$this->assertEquals($midpoint->getLongitude(), $fraction05->getLongitude());
}
