public function testMap()
{
$env = ['user' => 'ikr'];
$io = IO::of($env)->map(F\curry('F\\prop', 'user'))->map(F\curry('F\\map', 'strtoupper'));
$env['user'] = '******';
$this->assertEquals(Maybe::of('ROOT'), $io->unsafePerformIO());
}
public function testReliesOnTheFunctorsMapMethodIfItsPresent()
{
$this->assertEquals(Maybe::of('IKR'), F\map('strtoupper', Maybe::of('ikr')));
}
public function testHasPrecurriedVersion()
{
$this->assertEquals(Maybe::of('Ax'), call_user_func(F\C1\prop('name'), ['name' => 'Ax', 'age' => 92]));
}
public function testChain2()
{
$this->assertEquals(Maybe::of(null), Maybe::of(null)->chain(F\C1\prop('address'))->chain(F\C1\prop('street')));
}
