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