phpstreams\Stream::count PHP Method

    public function count()
    {
        return iterator_count($this);
    }

 public function testCount()
 {
     $stream = new Stream([1, 2, 3, 4, 5, 6]);
     $this->assertEquals(6, $stream->count());
     $this->assertEquals(6, count($stream));
     $filteredStream = $stream->filter(function ($value) {
         return $value % 2 == 1;
     });
     $this->assertEquals(3, $filteredStream->count());
 }