'Updates C{MAX_LENGTH} for {self.netstringReceiver} (to avoid
C{NetstringParseErrors} that might be raised if the size
exceeds the default C{MAX_LENGTH}).
Calculates and returns one \'chunk\' of data and the total size
of the netstring.
@param chunkSize: The size of chunks that will be received.
@type chunkSize: C{int}
@param numberOfChunks: The number of C{chunkSize}-sized chunks
that will be received.
@type numberOfChunks: C{int}
@return: A tuple consisting of string of C{chunkSize} \'a\'
characters and the size of the netstring data portion.'

def configureCombination(self, chunkSize, numberOfChunks):

    chunk = ('a' * chunkSize)
    dataSize = (chunkSize * numberOfChunks)
    self.netstringReceiver.MAX_LENGTH = dataSize
    numberOfDigits = (math.ceil(math.log10(dataSize)) + 1)
    return (chunk, dataSize)
