public function test_reject_removes_elements_passing_truth_test()
{
$c = new Collection(array('foo', 'bar'));
$this->assertEquals(array('foo'), $c->reject('bar')->values()->all());
$c = new Collection(array('foo', 'bar'));
$this->assertEquals(array('foo'), $c->reject(function ($v) {
return $v == 'bar';
})->values()->all());
$c = new Collection(array('foo', null));
$this->assertEquals(['foo'], $c->reject(null)->values()->all());
$c = new Collection(array('foo', 'bar'));
$this->assertEquals(array('foo', 'bar'), $c->reject('baz')->values()->all());
$c = new Collection(array('foo', 'bar'));
$this->assertEquals(array('foo', 'bar'), $c->reject(function ($v) {
return $v == 'baz';
})->values()->all());
}