font_fallback_unittest.cc | Explore in Territory

// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/354829279): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include <tuple>

#include "base/containers/contains.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/test/task_environment.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/icu/source/common/unicode/uchar.h"
#include "third_party/icu/source/common/unicode/uscript.h"
#include "third_party/icu/source/common/unicode/utf16.h"
#include "third_party/skia/include/core/SkTypeface.h"
#include "ui/gfx/font_fallback_win.h"
#include "ui/gfx/platform_font.h"
#include "ui/gfx/test/font_fallback_test_data.h"

namespace gfx {

namespace {

// Options to parameterized unittests.
struct FallbackFontTestOption { … };

const FallbackFontTestOption default_fallback_option = …;
// Options for tests that does not validate the GetFallbackFont(...) parameters.
const FallbackFontTestOption untested_fallback_option = …;

struct BaseFontTestOption { … };

constexpr BaseFontTestOption default_base_font;
constexpr BaseFontTestOption styled_font = …;
constexpr BaseFontTestOption sans_font = …;

FallbackFontTestParamInfo;

class GetFallbackFontTest
    : public ::testing::TestWithParam<FallbackFontTestParamInfo> { … };

}  // namespace

// This test ensures the font fallback work correctly. It will ensures that
//   1) The script supports the text
//   2) The input font does not already support the text
//   3) The call to GetFallbackFont() succeed
//   4) The fallback font has a glyph for every character of the text
//
// The previous checks can be activated or deactivated through the class
// FallbackFontTestOption (e.g. test_option_).
TEST_P(GetFallbackFontTest, GetFallbackFont) { … }

// Produces a font test case for every script.
std::vector<FallbackFontTestCase> GetSampleFontTestCases() { … }

// Ensures that the default fallback font gives known results. The test
// is validating that a known fallback font is given for a given text and font.
INSTANTIATE_TEST_SUITE_P(…);

// Ensures that font fallback functions are working properly for any string
// (strings from any script). The test doesn't enforce the functions to
// give a fallback font. The accepted behaviors are:
//    1) The fallback function failed and doesn't provide a fallback.
//    2) The fallback function succeeded and the font supports every glyphs.
INSTANTIATE_TEST_SUITE_P(…);

}  // namespace gfx
chromium/ui/gfx/font_fallback_unittest.cc
