Add Time based rolling policy fuzzer

[AdamKorcz]

Adds a fuzzer that tests TimeBasedRollingPolicy->rollover().

[swebb2066]

Preconditions should be specified in the interface but are not yet being part of the C++ language.

Do you agree that the caller has a responseability to honour preconditions?

[swebb2066]

This will violate an undocumented but assumed precondition that a buffer of this size can be allocated by the system.

[AdamKorcz]

Thanks. What would a generous but still reasonable max size be here? Could we do 10,000?

[swebb2066]

I suggest leaving it as a default. A reasonable precondition would say "big enough for a few logging events and not bigger than the system can handle"

[rm5248]

Looking at the code, it seems that it is not actually allocating the amount of memory as defined by setBufferSize. It will expand up to the limit:

logging-log4cxx/src/main/cpp/bufferedwriter.cpp

Lines 67 to 83 in da0313e

	void BufferedWriter::write(const LogString& str, Pool& p)
	{
	if (m_priv->buf.length() + str.length() > m_priv->sz)
	{
	m_priv->out->write(m_priv->buf, p);
	m_priv->buf.erase(m_priv->buf.begin(), m_priv->buf.end());
	}
	if (str.length() > m_priv->sz)
	{
	m_priv->out->write(str, p);
	}
	else
	{
	m_priv->buf.append(str);
	}
	}

So a random number here probably doesn't hurt, although I don't think it would actually cause any bugs either.

[AdamKorcz]

Do you agree that the caller has a responseability to honour preconditions?

Yes.