michael@0: There are two major categories of tests, segregated into different
michael@0: top-level directories under test/.
michael@0: 
michael@0: The first category (ipdl/) is IPDL-compiler tests.  These tests check
michael@0: that the IPDL compiler is successfully compiling correct
michael@0: specifications, and successfully rejecting erroneous specifications.
michael@0: 
michael@0: The second category (cxx/) is C++ tests of IPDL semantics.  These
michael@0: tests check that async/sync/rpc semantics are implemented correctly,
michael@0: ctors/dtors behave as they should, etc.