Test::memory::cycle checks for memory leaks and circular memory references. it's a thin test::more-compatible wrapper around lincoln stein's devel::cycle module.

perl's garbage collection has one big problem: circular references can't get cleaned up. a circular reference can be as simple as two reference that refer to each other. test::memory::cycle is built on top of devel::cycle to give you an easy way to check for these circular references. you can also use memory_cycle_exists() to make sure that you have a cycle where you expect to have one.