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