Add test

Author: RossBrunton

offload/unittests/OffloadAPI/CMakeLists.txt

@@ -12,6 +12,10 @@ add_offload_unittest("event"
     event/olDestroyEvent.cpp
     event/olWaitEvent.cpp)
 
+add_offload_unittest("init"
+    init/olInit.cpp)
+target_compile_definitions("init.unittests" PRIVATE DISABLE_WRAPPER)
+
 add_offload_unittest("kernel"
     kernel/olGetKernel.cpp
     kernel/olLaunchKernel.cpp)

offload/unittests/OffloadAPI/common/Environment.cpp

@@ -17,11 +17,13 @@ using namespace llvm;
 
 // Wrapper so we don't have to constantly init and shutdown Offload in every
 // test, while having sensible lifetime for the platform environment
+#ifndef DISABLE_WRAPPER
 struct OffloadInitWrapper {
   OffloadInitWrapper() { olInit(); }
   ~OffloadInitWrapper() { olShutDown(); }
 };
 static OffloadInitWrapper Wrapper{};
+#endif
 
 static cl::opt<std::string>
     SelectedPlatform("platform", cl::desc("Only test the specified platform"),

offload/unittests/OffloadAPI/init/olInit.cpp

@@ -0,0 +1,22 @@
+//===------- Offload API tests - olInit -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// NOTE: For this test suite, the implicit olInit/olShutDown doesn't happen, so
+// tests have to do it themselves
+
+#include "../common/Fixtures.hpp"
+#include <OffloadAPI.h>
+#include <gtest/gtest.h>
+
+struct olInitTest : ::testing::Test {};
+
+TEST_F(olInitTest, Uninitialized) {
+  ASSERT_ERROR(OL_ERRC_UNINITIALIZED,
+               olIterateDevices(
+                   [](ol_device_handle_t, void *) { return false; }, nullptr));
+}