Improve support for multiselect list box accessibility on Windows.

base/win/enum_variant_unittest.cc

Index: base/win/enum_variant_unittest.cc
===================================================================
--- base/win/enum_variant_unittest.cc	(revision 0)
+++ base/win/enum_variant_unittest.cc	(revision 0)
@@ -0,0 +1,118 @@
+// 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 "base/win/scoped_com_initializer.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+namespace win {
+
+TEST(EnumVariantTest, EmptyEnumVariant) {
+  ScopedCOMInitializer com_initializer;
+
+  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);
+}
+
+TEST(EnumVariantTest, SimpleEnumVariant) {
+  ScopedCOMInitializer com_initializer;
+
+  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);
+}
+
+}  // namespace win
+}  // namespace base