public function testContains()
{
$c = new Collection([1, 3, 5]);
$this->assertTrue($c->contains(1));
$this->assertFalse($c->contains(2));
$this->assertTrue($c->contains(function ($value) {
return $value < 5;
}));
$this->assertFalse($c->contains(function ($value) {
return $value > 5;
}));
$c = new Collection([['v' => 1], ['v' => 3], ['v' => 5]]);
$this->assertTrue($c->contains('v', 1));
$this->assertFalse($c->contains('v', 2));
$c = new Collection(['date', 'class', (object) ['foo' => 50]]);
$this->assertTrue($c->contains('date'));
$this->assertTrue($c->contains('class'));
$this->assertFalse($c->contains('foo'));
}
