br := NewReaderSize(tt.r, tt.bufSize)
		if tt.peekSize > 0 {
			peekBuf, err := br.Peek(tt.peekSize)
			if err != nil {
				t.Errorf("%s: Peek(%d): %v", tt.name, tt.peekSize, err)
				continue
			}
			if len(peekBuf) != tt.peekSize {
				t.Errorf("%s: len(Peek(%d)) = %v; want %v", tt.name, tt.peekSize, len(peekBuf), tt.peekSize)
				continue
			}
		}
		discarded, err := br.Discard(tt.n)