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// Copyright 2020 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 "components/feedback/feedback_util.h"
#include <string>
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/files/scoped_temp_dir.h"
#include "base/rand_util.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace feedback_util {
// Note: This file is excluded from win build.
// See https://crbug.com/1119560.
class FeedbackUtilTest : public ::testing::Test {
public:
void SetUp() override { ASSERT_TRUE(temp_dir_.CreateUniqueTempDir()); }
base::ScopedTempDir temp_dir_;
};
TEST_F(FeedbackUtilTest, ReadEndOfFileEmpty) {
std::string read_data("should be erased");
base::FilePath file_path = temp_dir_.GetPath().Append("test_empty.txt");
WriteFile(file_path, "", 0);
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 10, &read_data));
EXPECT_EQ(0u, read_data.length());
}
TEST_F(FeedbackUtilTest, ReadEndOfFileSmall) {
const char kTestData[] = "0123456789"; // Length of 10
std::string read_data;
base::FilePath file_path = temp_dir_.GetPath().Append("test_small.txt");
WriteFile(file_path, kTestData, strlen(kTestData));
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 15, &read_data));
EXPECT_EQ(kTestData, read_data);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 10, &read_data));
EXPECT_EQ(kTestData, read_data);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 2, &read_data));
EXPECT_EQ("89", read_data);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 3, &read_data));
EXPECT_EQ("789", read_data);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 5, &read_data));
EXPECT_EQ("56789", read_data);
}
TEST_F(FeedbackUtilTest, ReadEndOfFileWithZeros) {
const size_t test_size = 10;
std::string test_data("abcd\0\0\0\0hi", test_size);
std::string read_data;
base::FilePath file_path = temp_dir_.GetPath().Append("test_zero.txt");
WriteFile(file_path, test_data.data(), test_size);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 15, &read_data));
EXPECT_EQ(test_data, read_data);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 10, &read_data));
EXPECT_EQ(test_data, read_data);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 2, &read_data));
EXPECT_EQ(test_data.substr(test_size - 2, 2), read_data);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 3, &read_data));
EXPECT_EQ(test_data.substr(test_size - 3, 3), read_data);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 5, &read_data));
EXPECT_EQ(test_data.substr(test_size - 5, 5), read_data);
}
TEST_F(FeedbackUtilTest, ReadEndOfFileMedium) {
std::string test_data = base::RandBytesAsString(10000); // 10KB data
std::string read_data;
const size_t test_size = test_data.length();
base::FilePath file_path = temp_dir_.GetPath().Append("test_med.txt");
WriteFile(file_path, test_data.data(), test_size);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 15000, &read_data));
EXPECT_EQ(test_data, read_data);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 10000, &read_data));
EXPECT_EQ(test_data, read_data);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 1000, &read_data));
EXPECT_EQ(test_data.substr(test_size - 1000, 1000), read_data);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 300, &read_data));
EXPECT_EQ(test_data.substr(test_size - 300, 300), read_data);
read_data.clear();
EXPECT_TRUE(feedback_util::ReadEndOfFile(file_path, 175, &read_data));
EXPECT_EQ(test_data.substr(test_size - 175, 175), read_data);
}
} // namespace feedback_util
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