/** * Tests contains * * @return void */ public function testContains() { $items = ['a' => 1, 'b' => 2, 'c' => 3]; $collection = new Collection($items); $this->assertTrue($collection->contains(2)); $this->assertTrue($collection->contains(1)); $this->assertFalse($collection->contains(10)); $this->assertFalse($collection->contains('2')); }