diff --git a/ipc/ipdl/test/cxx/PTestSanity.ipdl b/ipc/ipdl/test/cxx/PTestSanity.ipdl
deleted file mode 100644
index 3b3e130d4ab4..000000000000
--- a/ipc/ipdl/test/cxx/PTestSanity.ipdl
+++ /dev/null
@@ -1,21 +0,0 @@
-
-include "mozilla/_ipdltest/TestSanity.h";
-
-namespace mozilla {
-namespace _ipdltest {
-
-
-[ManualDealloc, ChildImpl="TestSanityChild", ParentImpl="TestSanityParent"]
-protocol PTestSanity {
-
-child:
-    async Ping(int zero, float zeroPtFive, int8_t dummy);
-    async __delete__();
-
-parent:
-    async Pong(int one, float zeroPtTwoFive, uint8_t dummy);
-};
-
-
-} // namespace mozilla
-} // namespace _ipdltest
diff --git a/ipc/ipdl/test/cxx/TestSanity.cpp b/ipc/ipdl/test/cxx/TestSanity.cpp
deleted file mode 100644
index ba1920fdcc2a..000000000000
--- a/ipc/ipdl/test/cxx/TestSanity.cpp
+++ /dev/null
@@ -1,52 +0,0 @@
-#include "TestSanity.h"
-
-#include "IPDLUnitTests.h"  // fail etc.
-
-namespace mozilla {
-namespace _ipdltest {
-
-//-----------------------------------------------------------------------------
-// parent
-
-TestSanityParent::TestSanityParent() { MOZ_COUNT_CTOR(TestSanityParent); }
-
-TestSanityParent::~TestSanityParent() { MOZ_COUNT_DTOR(TestSanityParent); }
-
-void TestSanityParent::Main() {
-  if (!SendPing(0, 0.5f, 0)) fail("sending Ping");
-}
-
-mozilla::ipc::IPCResult TestSanityParent::RecvPong(const int& one,
-                                                   const float& zeroPtTwoFive,
-                                                   const uint8_t& /*unused*/) {
-  if (1 != one) fail("invalid argument `%d', should have been `1'", one);
-
-  if (0.25f != zeroPtTwoFive)
-    fail("invalid argument `%g', should have been `0.25'", zeroPtTwoFive);
-
-  Close();
-
-  return IPC_OK();
-}
-
-//-----------------------------------------------------------------------------
-// child
-
-TestSanityChild::TestSanityChild() { MOZ_COUNT_CTOR(TestSanityChild); }
-
-TestSanityChild::~TestSanityChild() { MOZ_COUNT_DTOR(TestSanityChild); }
-
-mozilla::ipc::IPCResult TestSanityChild::RecvPing(const int& zero,
-                                                  const float& zeroPtFive,
-                                                  const int8_t& /*unused*/) {
-  if (0 != zero) fail("invalid argument `%d', should have been `0'", zero);
-
-  if (0.5f != zeroPtFive)
-    fail("invalid argument `%g', should have been `0.5'", zeroPtFive);
-
-  if (!SendPong(1, 0.25f, 0)) fail("sending Pong");
-  return IPC_OK();
-}
-
-}  // namespace _ipdltest
-}  // namespace mozilla
diff --git a/ipc/ipdl/test/cxx/TestSanity.h b/ipc/ipdl/test/cxx/TestSanity.h
deleted file mode 100644
index ca29d6767243..000000000000
--- a/ipc/ipdl/test/cxx/TestSanity.h
+++ /dev/null
@@ -1,55 +0,0 @@
-#ifndef mozilla__ipdltest_TestSanity_h
-#define mozilla__ipdltest_TestSanity_h 1
-
-#include "mozilla/_ipdltest/IPDLUnitTests.h"
-
-#include "mozilla/_ipdltest/PTestSanityParent.h"
-#include "mozilla/_ipdltest/PTestSanityChild.h"
-
-namespace mozilla {
-namespace _ipdltest {
-
-class TestSanityParent : public PTestSanityParent {
-  friend class PTestSanityParent;
-
- public:
-  TestSanityParent();
-  virtual ~TestSanityParent();
-
-  static bool RunTestInProcesses() { return true; }
-  static bool RunTestInThreads() { return true; }
-
-  void Main();
-
- protected:
-  mozilla::ipc::IPCResult RecvPong(const int& one, const float& zeroPtTwoFive,
-                                   const uint8_t& dummy);
-
-  virtual void ActorDestroy(ActorDestroyReason why) override {
-    if (NormalShutdown != why) fail("unexpected destruction!");
-    passed("ok");
-    QuitParent();
-  }
-};
-
-class TestSanityChild : public PTestSanityChild {
-  friend class PTestSanityChild;
-
- public:
-  TestSanityChild();
-  virtual ~TestSanityChild();
-
- protected:
-  mozilla::ipc::IPCResult RecvPing(const int& zero, const float& zeroPtFive,
-                                   const int8_t& dummy);
-
-  virtual void ActorDestroy(ActorDestroyReason why) override {
-    if (NormalShutdown != why) fail("unexpected destruction!");
-    QuitChild();
-  }
-};
-
-}  // namespace _ipdltest
-}  // namespace mozilla
-
-#endif  // ifndef mozilla__ipdltest_TestSanity_h
diff --git a/ipc/ipdl/test/cxx/moz.build b/ipc/ipdl/test/cxx/moz.build
index 66a73e76efd7..35b139d5d4f0 100644
--- a/ipc/ipdl/test/cxx/moz.build
+++ b/ipc/ipdl/test/cxx/moz.build
@@ -12,7 +12,6 @@ EXPORTS.mozilla._ipdltest += [
     "IPDLUnitTestTypes.h",
     "IPDLUnitTestUtils.h",
     "TestOffMainThreadPainting.h",
-    "TestSanity.h",
     "TestSelfManageRoot.h",
     "TestShmem.h",
     "TestShutdown.h",
@@ -27,7 +26,6 @@ EXPORTS.mozilla._ipdltest += [
 
 SOURCES += [
     "TestOffMainThreadPainting.cpp",
-    "TestSanity.cpp",
     "TestSelfManageRoot.cpp",
     "TestShmem.cpp",
     "TestShutdown.cpp",
@@ -53,7 +51,6 @@ IPDL_SOURCES += [
     "PTestIndirectProtocolParamSecond.ipdl",
     "PTestPaintThread.ipdl",
     "PTestPriority.ipdl",
-    "PTestSanity.ipdl",
     "PTestSelfManage.ipdl",
     "PTestSelfManageRoot.ipdl",
     "PTestShmem.ipdl",