Add unit tests to verify release of framework objects

[sbabcoc]

I had to make significant revisions to resolve memory consumption issues caused by unmanaged retention of framework object references. To ensure that I don't introduce regressions in future revisions, I need to add unit tests to verify that all collected references are released at key points of execution for all supported scenarios:

• Standard happy-path execution
• Pass on automatic retry
• Fail on automatic retry
• Method-specific timeout
• Rule-based timeout
• Parameterized runner
• JUnitParams runner
• Theories runner
• PowerMock runner

Checks for reference retention must be performed at relevant points in the flow of execution. This can probably be accomplished with a properly crafted watcher/listener class.

[sbabcoc]

• SCOPE: Theories runner "theory catalyst"

  • MethodBlock.RUNNER_TO_STATEMENT (Theories runner)

• SCOPE: Atomic Test / Test Class Instance

  • ArtifactCollector.WATCHER_MAP
  • CreateTest.HASHCODE_TO_TARGET
  • CreateTest.TARGET_TO_METHOD
  • CreateTest.TARGET_TO_RUNNER
  • EachTestNotifierInit.DESCRIPTION_TO_ATOMICTEST
  • EachTestNotifierInit.TARGET_TO_DESCRIPTION
  • EachTestNotifierInit.DESCRIPTION_TO_TARGET
  • EachTestNotifierInit.HASHCODE_TO_DESCRIPTION
  • RunReflectiveCall.DESCRIPTION_TO_CALLABLE

• SCOPE: Class Runner

  • Run.START_NOTIFIED
  • Run.CHILD_TO_PARENT
  • Run.RUNNER_TO_NOTIFIER
  • RunChild.DID_NOTIFY

• SCOPE: Test Run

  • Run.RUNNER_STACK

• Unmanaged

  • Run.NOTIFIERS