Improve support for multiselect list box accessibility on Windows.

base/win/enum_variant_unittest.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/win/enum_variant.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+namespace win {
+
+TEST(EnumVariantTest, EmptyEnumVariant) {
+  EXPECT_TRUE(SUCCEEDED(::CoInitialize(NULL)));
+
+  {
+    EnumVariant* ev = new EnumVariant(0);
+    ev->AddRef();
+
+    IUnknown* iunknown;
+    EXPECT_TRUE(SUCCEEDED(
+        ev->QueryInterface(IID_IUnknown, reinterpret_cast<void**>(&iunknown))));
+    iunknown->Release();
+
+    IEnumVARIANT* ienumvariant;
+    EXPECT_TRUE(SUCCEEDED(
+        ev->QueryInterface(IID_IEnumVARIANT,
+                           reinterpret_cast<void**>(&ienumvariant))));
+    EXPECT_EQ(ev, ienumvariant);
+    ienumvariant->Release();
+
+    VARIANT out_element;
+    ULONG out_received = 0;
+    EXPECT_EQ(S_FALSE, ev->Next(1, &out_element, &out_received));
+    EXPECT_EQ(0, out_received);
+
+    EXPECT_EQ(S_FALSE, ev->Skip(1));
+
+    EXPECT_EQ(S_OK, ev->Reset());
+
+    IEnumVARIANT* ev2 = NULL;
+    EXPECT_EQ(S_OK, ev->Clone(&ev2));
+
+    EXPECT_NE(static_cast<IEnumVARIANT*>(NULL), ev2);
+    EXPECT_NE(ev, ev2);
+    EXPECT_EQ(S_FALSE, ev2->Skip(1));
+    EXPECT_EQ(S_OK, ev2->Reset());
+
+    ULONG ev2_finalrefcount = ev2->Release();
+    EXPECT_EQ(0, ev2_finalrefcount);
+
+    ULONG ev_finalrefcount = ev->Release();
+    EXPECT_EQ(0, ev_finalrefcount);
+  }
+
+  ::CoUninitialize();
+}
+
+TEST(EnumVariantTest, SimpleEnumVariant) {
+  EXPECT_TRUE(SUCCEEDED(::CoInitialize(NULL)));
+
+  {
+    EnumVariant* ev = new EnumVariant(3);
+    ev->AddRef();
+    ev->ItemAt(0)->vt = VT_I4;
+    ev->ItemAt(0)->lVal = 10;
+    ev->ItemAt(1)->vt = VT_I4;
+    ev->ItemAt(1)->lVal = 20;
+    ev->ItemAt(2)->vt = VT_I4;
+    ev->ItemAt(2)->lVal = 30;
+
+    // Get elements one at a time.
+    VARIANT out_element;
+    ULONG out_received = 0;
+    EXPECT_EQ(S_OK, ev->Next(1, &out_element, &out_received));
+    EXPECT_EQ(1, out_received);
+    EXPECT_EQ(VT_I4, out_element.vt);
+    EXPECT_EQ(10, out_element.lVal);
+    EXPECT_EQ(S_OK, ev->Skip(1));
+    EXPECT_EQ(S_OK, ev->Next(1, &out_element, &out_received));
+    EXPECT_EQ(1, out_received);
+    EXPECT_EQ(VT_I4, out_element.vt);
+    EXPECT_EQ(30, out_element.lVal);
+    EXPECT_EQ(S_FALSE, ev->Next(1, &out_element, &out_received));
+
+    // Reset and get all elements at once.
+    VARIANT out_elements[3];
+    EXPECT_EQ(S_OK, ev->Reset());
+    EXPECT_EQ(S_OK, ev->Next(3, out_elements, &out_received));
+    EXPECT_EQ(3, out_received);
+    EXPECT_EQ(VT_I4, out_elements[0].vt);
+    EXPECT_EQ(10, out_elements[0].lVal);
+    EXPECT_EQ(VT_I4, out_elements[1].vt);
+    EXPECT_EQ(20, out_elements[1].lVal);
+    EXPECT_EQ(VT_I4, out_elements[2].vt);
+    EXPECT_EQ(30, out_elements[2].lVal);
+    EXPECT_EQ(S_FALSE, ev->Next(1, &out_element, &out_received));
+
+    // Clone it.
+    IEnumVARIANT* ev2 = NULL;
+    EXPECT_EQ(S_OK, ev->Clone(&ev2));
+    EXPECT_TRUE(ev2 != NULL);
+    EXPECT_EQ(S_FALSE, ev->Next(1, &out_element, &out_received));
+    EXPECT_EQ(S_OK, ev2->Reset());
+    EXPECT_EQ(S_OK, ev2->Next(3, out_elements, &out_received));
+    EXPECT_EQ(3, out_received);
+    EXPECT_EQ(VT_I4, out_elements[0].vt);
+    EXPECT_EQ(10, out_elements[0].lVal);
+    EXPECT_EQ(VT_I4, out_elements[1].vt);
+    EXPECT_EQ(20, out_elements[1].lVal);
+    EXPECT_EQ(VT_I4, out_elements[2].vt);
+    EXPECT_EQ(30, out_elements[2].lVal);
+    EXPECT_EQ(S_FALSE, ev2->Next(1, &out_element, &out_received));
+
+    ULONG ev2_finalrefcount = ev2->Release();
+    EXPECT_EQ(0, ev2_finalrefcount);
+
+    ULONG ev_finalrefcount = ev->Release();
+    EXPECT_EQ(0, ev_finalrefcount);
+  }
+
+  ::CoUninitialize();
+}
+
+}  // namespace win
+}  // namespace base