public function testPropOr()
{
$assoc = ["x" => 100];
$x = P::propOr('x');
$y = P::propOr('y');
$xOr200 = $x(200);
$yOr200 = $y(200);
$this->assertEquals(100, P::propOr('x', 200, $assoc));
$this->assertEquals(200, P::propOr('y', 200, $assoc));
$this->assertEquals(100, $xOr200($assoc));
$this->assertEquals(200, $yOr200($assoc));
}