test: Add an idl testcase

test/idltest.idl

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2020 Martin Storsjo
+ *
+ * This file is part of llvm-mingw.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+import "unknwn.idl";
+
+[
+    uuid(73ad110f-de60-4d7a-899a-58f2afc033a7),
+]
+interface ITestClass : IUnknown
+{
+    HRESULT DoSomething([in] ULONG param);
+}
+
+cpp_quote("DEFINE_GUID(CLSID_TestClassImplementation, 0x5247bb7c,0x51d6,0x42ce,0xa3,0xd1,0x1c,0xe9,0x65,0xf6,0x93,0x72);")