improved buffer tests

delay/buffer.hpp

@@ -19,7 +19,7 @@
  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
- * File: dsp_ringbuffer.hpp
+ * File: buffer.hpp.hpp
  * Author Jens Ahrensfeld on 26.10.2025.
  */
 
@@ -31,7 +31,6 @@
 #include <stdint.h>
 #include <sys/types.h>
 #include <dsp_types.hpp>
-#include <iostream>
 
 namespace dsp {