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 To add a new IPDL C++ unit test, you need to create (at least) the

 following files (for a test "TestFoo"):

   - PTestFoo.ipdl, specifying the top-level protocol used for the test

   - TestFoo.h, declaring the top-level parent/child actors used for

     the test

   - TestFoo.cpp, defining the top-level actors

   - (make sure all are in the namespace mozilla::_ipdltest)

 Next

   - add PTestFoo.ipdl to ipdl.mk

   - append TestFoo to the variable IPDLTESTS in Makefile.in

 You must define three methods in your |TestFooParent| class:

   - static methods |bool RunTestInProcesses()| and

     |bool RunTestInThreads()|.  These methods control whether

     to execute the test using actors in separate processes and

     threads respectively.  Generally, both should return true.

   - an instance method |void Main()|.  The test harness wil first

     initialize the processes or threads, create and open both actors,

     and then kick off the test using |Main()|.  Make sure you define

     it.

 If your test passes its criteria, please call

 |MOZ_IPDL_TESTPASS("msg")| and "exit gracefully".

 If your tests fails, please call |MOZ_IPDL_TESTFAIL("msg")| and "exit

 ungracefully", preferably by abort()ing.

 If all goes well, running

   make -C $OBJDIR/ipc/ipdl/test/cxx

 will update the file IPDLUnitTests.cpp (the test launcher), and your

 new code will be built automatically.

 You can launch your new test by invoking one of

   make -C $OBJDIR/ipc/ipdl/test/cxx check-proc     (test process-based tests)

   make -C $OBJDIR/ipc/ipdl/test/cxx check-threads  (test thread-based tests)

   make -C $OBJDIR/ipc/ipdl/test/cxx check          (tests both)

 If you want to launch only your test, run

   cd $OBJDIR/dist/bin

   ./run-mozilla.sh ./ipdlunittest TestFoo          (test in two processes, if appl.)

   ./run-mozilla.sh ./ipdlunittest thread:TestFoo   (test in two threads, if appl.)

 For a bare-bones example of adding a test, take a look at

 PTestSanity.ipdl, TestSanity.h, TestSanity.cpp, and how "TestSanity"

 is included in ipdl.mk and Makefile.in.