public void WriteAndReadCharViaDiskFile()
{
var file = new DiskFile("test4c.dat", "rwb");
Assert.NotNull(file);
Assert.True(file.CanWrite);
file.WriteChar(13);
file.WriteChar(17);
file.Seek(0);
var rd = file.ReadChar();
Assert.Equal(13, rd);
rd = file.ReadChar();
Assert.Equal(17, rd);
file.Close();
Assert.False(file.IsOpen);
}