This is an almost feature complete alpha of Test::Builder1.5 (Test::Builder with Test::Builder2's internals). It is all but feature complete and passes nearly all tests.
If you find any bugs or incompatibilities, please report them at https://github.com/schwern/test-more/issues
WHAT TEST::BUILDER2 IS
It is a rewrite of the skeleton that holds together all the popular Test:: libraries. Its aim is to increase flexibility and allow Perl authors to do pretty much whatever they please while still not having to worry about the minutiae of test formats or coordinating with other test libraries.
WHAT TEST::BUILDER2 IS NOT
It is not a rewrite of Test::More. Maybe later we can do Test::More2.
It doesn't directly effect how people write tests, but how people write test libraries (which people then use to write tests). Many things that were previously impossible are now possible.
COMPATIBILITY
Test::Builder, Test::More and Test::Simple will continue to work as before.
Test::Builder2 is not directly compatible with Test::Builder, thus the new namespace.
Test modules built with Test::Builder will work together with those built with Test::Builder2.
WHAT WORKS
All the existing Test::Builder and Test::More features Test event hooks Multiple formatters (ie. you can output something other than TAP) Test::Builder using Test::Builder2 Event Handlers (ie. things like Test::NoWarnings)
WHAT DOESN'T WORK
Assert stacks (ie. no more $Test::Builder::Level) Structured diagnostics Threads Test::Aggregate Test::Group Test::SharedFork
WHERE TO LOOK
An outline of the redesign is in TB2::Design.
More information can be had at https://github.com/schwern/test-more/
EXAMPLES
Examples can be found in examples/TB2. These include: