Unit tests for I/O functions

[Jason House]

BCS wrote:
> Reply to Jason,
> 
>> If I have a class that reads from an InputStream and writes to an
>> OutputStream, what is the recommended method for writing a unit test
>> for sending commands in one stream and testing its output of the other
>> stream?  Would a pair of MemoryStream's be most appropriate?
>>
> 
> that's what I do.
> 
> 

So far, I haven't had any success with the unit tests even though the 
normal usage works fine...

The thread's run function has something to the effect of:
while(1){
   char[] command = inStream.readLine();
   process(command);
}

It seems that readLine does not block with a memoryStream like it does 
with din and dout.  What's the best work around?


PS: I tried the following but had no luck.  process(command) never got 
called after the unit test wrote to the stream (with writefln):

while(1){
   char[] command = inStream.readLine();
   if (command.length == 0)
     continue;
   process(command);
}