public function testRemoveElement()
{
$elements = [1, 'A' => 'a', 2, 'B' => 'b', 3, 'A2' => 'a', 'B2' => 'b'];
$collection = new ArrayCollection($elements);
$this->assertTrue($collection->removeElement(1));
unset($elements[0]);
$this->assertFalse($collection->removeElement('non-existent'));
$this->assertTrue($collection->removeElement('a'));
unset($elements['A']);
$this->assertTrue($collection->removeElement('a'));
unset($elements['A2']);
$this->assertSame($elements, $collection->toArray());
}
