/**
* It should merge another colleciton into itself.
*/
public function testMergeCollection()
{
$collection = new SuiteCollection([$this->suite1->reveal()]);
$newCollection = new SuiteCollection([$this->suite2->reveal(), $this->suite3->reveal()]);
$collection->mergeCollection($newCollection);
$this->assertEquals([$this->suite1->reveal(), $this->suite2->reveal(), $this->suite3->reveal()], $collection->getSuites());
}