t.Errorf("Read into empty buffer returned unexpected n of %d", n)
	}
}

func TestReadByOneByte(t *testing.T) {
	r := New(NewSource(1))
	b1 := make([]byte, 100)
	_, err := io.ReadFull(iotest.OneByteReader(r), b1)
	if err != nil {
		t.Errorf("read by one byte: %v", err)
	}
	r = New(NewSource(1))
	b2 := make([]byte, 100)
	_, err = r.Read(b2)
	if err != nil {
		t.Errorf("read: %v", err)
	}

		return strings.NewReader(s)
	}},
	{"ReaderOnly", func(s string) io.Reader {
		return struct{ io.Reader }{strings.NewReader(s)}
	}},
	{"OneByteReader", func(s string) io.Reader {
		return iotest.OneByteReader(strings.NewReader(s))
	}},
	{"DataErrReader", func(s string) io.Reader {
		return iotest.DataErrReader(strings.NewReader(s))
	}},
}