Font fallback for UI

ui/gfx/win/text_analysis_source_unittest.cc

+// Copyright 2016 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 "ui/gfx/win/text_analysis_source.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/win/direct_write.h"
+
+namespace mswr = Microsoft::WRL;
+
+namespace gfx {
+namespace win {
+
+namespace {
+
+DWRITE_READING_DIRECTION kReadingDirection =
+    DWRITE_READING_DIRECTION_TOP_TO_BOTTOM;
+const wchar_t* kLocale = L"hi-in";
+const wchar_t kText[] = L"sample text";
+const size_t kTextLength = _countof(kText) - 1;
+
+}  // namespace
+
+class TextAnalysisSourceTest : public testing::Test {
+ public:
+  TextAnalysisSourceTest() {
+    mswr::ComPtr<IDWriteFactory> factory;
+    CreateDWriteFactory(&factory);
+
+    mswr::ComPtr<IDWriteNumberSubstitution> number_substitution;
+    factory->CreateNumberSubstitution(DWRITE_NUMBER_SUBSTITUTION_METHOD_NONE,
+                                      kLocale, true /* ignoreUserOverride */,
+                                      &number_substitution);
+
+    mswr::MakeAndInitialize<TextAnalysisSource>(
+        &source_, kText, kLocale, number_substitution.Get(), kReadingDirection);
+  }
+
+ protected:
+  mswr::ComPtr<TextAnalysisSource> source_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TextAnalysisSourceTest);
+};
+
+TEST_F(TextAnalysisSourceTest, TestGetLocaleName) {
+  UINT32 length = 0;
+  const wchar_t* locale_name = nullptr;
+  HRESULT hr = E_FAIL;
+  hr = source_->GetLocaleName(0, &length, &locale_name);
+
+  EXPECT_TRUE(SUCCEEDED(hr));
+  EXPECT_EQ(kTextLength, length);
+  EXPECT_STREQ(kLocale, locale_name);
+
+  // Attempting to get a locale for a location that does not have a text chunk
+  // should fail.
+  hr = source_->GetLocaleName(kTextLength, &length, &locale_name);
+
+  EXPECT_TRUE(FAILED(hr));
+}
+
+TEST_F(TextAnalysisSourceTest, TestGetNumberSubstitution) {
+  UINT32 length = 0;
+  mswr::ComPtr<IDWriteNumberSubstitution> number_substitution;
+  HRESULT hr = E_FAIL;
+  hr = source_->GetNumberSubstitution(0, &length, &number_substitution);
+
+  EXPECT_TRUE(SUCCEEDED(hr));
+  EXPECT_EQ(kTextLength, length);
+  EXPECT_NE(nullptr, number_substitution.Get());
+
+  // Attempting to get a number substitution for a location that does not have
+  // a text chunk should fail.
+  hr = source_->GetNumberSubstitution(kTextLength, &length,
+                                      &number_substitution);
+
+  EXPECT_TRUE(FAILED(hr));
+}
+
+TEST_F(TextAnalysisSourceTest, TestGetParagraphReadingDirection) {
+  EXPECT_EQ(kReadingDirection, source_->GetParagraphReadingDirection());
+}
+
+TEST_F(TextAnalysisSourceTest, TestGetTextAtPosition) {
+  UINT32 length = 0;
+  const wchar_t* text = nullptr;
+  HRESULT hr = E_FAIL;
+  hr = source_->GetTextAtPosition(0, &text, &length);
+
+  EXPECT_TRUE(SUCCEEDED(hr));
+  EXPECT_EQ(kTextLength, length);
+  EXPECT_STREQ(kText, text);
+
+  hr = source_->GetTextAtPosition(5, &text, &length);
+
+  EXPECT_TRUE(SUCCEEDED(hr));
+  EXPECT_EQ(kTextLength - 5, length);
+  EXPECT_STREQ(kText + 5, text);
+
+  // Trying to get a text chunk past the end should return null.
+  hr = source_->GetTextAtPosition(kTextLength, &text, &length);
+
+  EXPECT_TRUE(SUCCEEDED(hr));
+  EXPECT_EQ(nullptr, text);
+}
+
+TEST_F(TextAnalysisSourceTest, TestGetTextBeforePosition) {
+  UINT32 length = 0;
+  const wchar_t* text = nullptr;
+  HRESULT hr = E_FAIL;
+  // Trying to get a text chunk before the beginning should return null.
+  hr = source_->GetTextBeforePosition(0, &text, &length);
+
+  EXPECT_TRUE(SUCCEEDED(hr));
+  EXPECT_EQ(nullptr, text);
+
+  hr = source_->GetTextBeforePosition(5, &text, &length);
+
+  EXPECT_TRUE(SUCCEEDED(hr));
+  EXPECT_EQ(5u, length);
+  EXPECT_STREQ(kText, text);
+
+  hr = source_->GetTextBeforePosition(kTextLength, &text, &length);
+
+  EXPECT_TRUE(SUCCEEDED(hr));
+  EXPECT_EQ(kTextLength, length);
+  EXPECT_STREQ(kText, text);
+}
+
+}  // namespace win
+}  // namespace gfx