testReadFrom{fileOps{""}, 0, nil},
			testReadFrom{fileOps{"a"}, 0, ErrWriteTooLong},
			testRemaining{0, 0},
		},
	}, {
		maker: makeReg{5, "hello"},
		tests: []testFnc{
			testRemaining{5, 5},
			testWrite{"hello", 5, nil},
			testRemaining{0, 0},
		},
	}, {
		maker: makeReg{5, "\x00\x00\x00\x00\x00"},
		tests: []testFnc{
			testRemaining{5, 5},

		nonUTF8 bool
		flags   uint16
	}{
		{
			name:    "hi, hello",
			comment: "in the world",
			flags:   0x8,
		},
		{
			name:    "hi, こんにちわ",
			comment: "in the world",
			flags:   0x808,
		},
		{
			name:    "hi, こんにちわ",
			comment: "in the world",
			nonUTF8: true,
			flags:   0x8,
		},
		{
			name:    "hi, hello",
			comment: "in the 世界",
			flags:   0x808,
		},
		{