1 files changed, 97 insertions, 0 deletions
diff --git a/xpcom/tests/windows/TestCOM.cpp b/xpcom/tests/windows/TestCOM.cpp
new file mode 100644
index 0000000000..49f67db835
--- /dev/null
+++ b/xpcom/tests/windows/TestCOM.cpp
@@ -0,0 +1,97 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <windows.h>
+#include <unknwn.h>
+#include <stdio.h>
+#include "nsISupports.h"
+#include "nsCOMPtr.h"
+#include "mozilla/gtest/MozAssertions.h"
+#include "mozilla/RefPtr.h"
+
+// unknwn.h is needed to build with WIN32_LEAN_AND_MEAN
+#include <unknwn.h>
+
+#include "gtest/gtest.h"
+
+// {5846BA30-B856-11d1-A98A-00805F8A7AC4}
+#define NS_ITEST_COM_IID                            \
+  {                                                 \
+    0x5846ba30, 0xb856, 0x11d1, {                   \
+      0xa9, 0x8a, 0x0, 0x80, 0x5f, 0x8a, 0x7a, 0xc4 \
+    }                                               \
+  }
+
+class nsITestCom : public nsISupports {
+ public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ITEST_COM_IID)
+  NS_IMETHOD Test() = 0;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsITestCom, NS_ITEST_COM_IID)
+
+/*
+ * nsTestCom
+ */
+
+class nsTestCom final : public nsITestCom {
+  NS_DECL_ISUPPORTS
+
+ public:
+  nsTestCom() {}
+
+  NS_IMETHOD Test() override { return NS_OK; }
+
+  static int sDestructions;
+
+ private:
+  ~nsTestCom() { sDestructions++; }
+};
+
+int nsTestCom::sDestructions;
+
+NS_IMPL_QUERY_INTERFACE(nsTestCom, nsITestCom)
+
+MozExternalRefCountType nsTestCom::AddRef() {
+  nsrefcnt res = ++mRefCnt;
+  NS_LOG_ADDREF(this, mRefCnt, "nsTestCom", sizeof(*this));
+  return res;
+}
+
+MozExternalRefCountType nsTestCom::Release() {
+  nsrefcnt res = --mRefCnt;
+  NS_LOG_RELEASE(this, mRefCnt, "nsTestCom");
+  if (res == 0) {
+    delete this;
+  }
+  return res;
+}
+
+TEST(TestCOM, WindowsInterop)
+{
+  // Test that we can QI an nsITestCom to an IUnknown.
+  RefPtr<nsTestCom> t = new nsTestCom();
+  IUnknown* iUnknown = nullptr;
+  nsresult rv = t->QueryInterface(NS_GET_IID(nsISupports), (void**)&iUnknown);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(iUnknown);
+
+  // Test we can QI an IUnknown to nsITestCom.
+  nsCOMPtr<nsITestCom> iTestCom;
+  GUID testGUID = NS_ITEST_COM_IID;
+  HRESULT hr = iUnknown->QueryInterface(testGUID, getter_AddRefs(iTestCom));
+  ASSERT_TRUE(SUCCEEDED(hr));
+  ASSERT_TRUE(iTestCom);
+
+  // Make sure we can call our test function (and the pointer is valid).
+  rv = iTestCom->Test();
+  ASSERT_NS_SUCCEEDED(rv);
+
+  iUnknown->Release();
+  iTestCom = nullptr;
+  t = nullptr;
+
+  ASSERT_EQ(nsTestCom::sDestructions, 1);
+}