Create a NoHistory object rather than $history->should_keep_history

[schwern]

Rather than have a flag saying whether to keep history or not, have a subclass of History that does not store individual results.

It can keep summary information as long as that summary consumes O(1) memory. is_passing(), for example, and perhaps a summary of the number of tests which passed, failed, seen, etc...

It will throw an exception if you ask for information it does not have, like results() and summary().

For bonus points, allow a NoHistory object to be generated from a History object. That would summarize and store the current historical state for continuity.

[notbenh]

NoHistory Object

http://github.com/notbenh/test-more/blob/f5bd716b1763229d95d7b2b9d35679a768b70e90/lib/Test/Builder2/NoHistoryStack.pm

HistoryStack now has a consume method that will take a list of history objects (currently only HistoryStack's) and replay the history in the consuming object.

http://github.com/notbenh/test-more/commit/f5bd716b1763229d95d7b2b9d35679a768b70e90

So to 'strip' history would look something like:

my $no_history = Test::Builder2::NoHistoryStack->create->consume($history);

[schwern]

Solved by Test::Builder2::NoHistory.