SiroDiaz / DataStructures

        $this->assertTrue($this->queue->empty());

    }

    public function testPeek() {

        $this->queue = new Queue();

        $this->assertNull($this->queue->peek());

        $this->queue->enqueue(1000);

        $this->assertEquals($this->queue->peek(), 1000);

        $this->queue->enqueue(false);

        $this->assertEquals($this->queue->peek(), 1000);

        $this->queue->enqueue(3.14);

        $this->assertEquals($this->queue->peek(), 1000);

        $this->queue->enqueue(4);

        $this->assertEquals($this->queue->dequeue(), 1000);

        $this->assertEquals($this->queue->peek(), false);

        $this->assertEquals($this->queue->dequeue(), false);

        $this->assertEquals($this->queue->peek(), 3.14);

        $this->assertEquals($this->queue->dequeue(), 3.14);

        $this->assertEquals($this->queue->peek(), 4);

        $this->assertEquals($this->queue->dequeue(), 4);

        $this->assertNull($this->queue->peek());

    }

    public function testIsFull() {

        $this->queue = new Queue();

        $this->assertTrue($this->stack->empty());

    }

    public function testPeek() {

        $this->stack = new Stack();

        $this->assertNull($this->stack->peek());

        $this->stack->push(1000);

        $this->assertEquals($this->stack->peek(), 1000);

        $this->stack->push(false);

        $this->assertEquals($this->stack->peek(), false);

        $this->stack->push(3.14);

        $this->assertEquals($this->stack->peek(), 3.14);

        $this->stack->push(4);

        $this->assertEquals($this->stack->pop(), 4);

        $this->assertEquals($this->stack->peek(), 3.14);

        $this->assertEquals($this->stack->pop(), 3.14);

        $this->assertEquals($this->stack->peek(), false);

        $this->assertEquals($this->stack->pop(), false);

        $this->assertEquals($this->stack->peek(), 1000);

        $this->assertEquals($this->stack->pop(), 1000);

        $this->assertNull($this->stack->peek());

    }

    public function testIsFull() {

        $this->stack = new Stack();