public function testMap()
{
$seq = new Sequence();
$seq->add('a');
$seq->add('b');
$self = $this;
$newSeq = $seq->map(function ($elem) use($self) {
switch ($elem) {
case 'a':
return 'c';
case 'b':
return 'd';
default:
$self->fail('Unexpected element: ' . var_export($elem, true));
}
});
$this->assertInstanceOf('Collection\\Sequence', $newSeq);
$this->assertNotSame($newSeq, $seq);
$this->assertEquals(['c', 'd'], $newSeq->all());
}