logging_splitters_test.cpp - platform/system/libbase - Git at Google

 /*
  * Copyright (C) 2020 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "logging_splitters.h"

 #include <string>
 #include <vector>

 #include <android-base/strings.h>
 #include <gtest/gtest.h>

 namespace android {
 namespace base {

 void TestNewlineSplitter(const std::string& input,
                          const std::vector<std::string>& expected_output) {
   std::vector<std::string> output;
   auto logger_function = [&](const char* msg, int length) {
     if (length == -1) {
       output.push_back(msg);
     } else {
       output.push_back(std::string(msg, length));
     }
   };
   SplitByLines(input.c_str(), logger_function);

   EXPECT_EQ(expected_output, output);
 }

 TEST(logging_splitters, NewlineSplitter_EmptyString) {
   TestNewlineSplitter("", std::vector<std::string>{""});
 }

 TEST(logging_splitters, NewlineSplitter_BasicString) {
   TestNewlineSplitter("normal string", std::vector<std::string>{"normal string"});
 }

 TEST(logging_splitters, NewlineSplitter_ormalBasicStringTrailingNewline) {
   TestNewlineSplitter("normal string\n", std::vector<std::string>{"normal string", ""});
 }

 TEST(logging_splitters, NewlineSplitter_MultilineTrailing) {
   TestNewlineSplitter("normal string\nsecond string\nthirdstring",
                       std::vector<std::string>{"normal string", "second string", "thirdstring"});
 }

 TEST(logging_splitters, NewlineSplitter_MultilineTrailingNewline) {
   TestNewlineSplitter(
       "normal string\nsecond string\nthirdstring\n",
       std::vector<std::string>{"normal string", "second string", "thirdstring", ""});
 }

 TEST(logging_splitters, NewlineSplitter_MultilineEmbeddedNewlines) {
   TestNewlineSplitter(
       "normal string\n\n\nsecond string\n\nthirdstring\n",
       std::vector<std::string>{"normal string", "", "", "second string", "", "thirdstring", ""});
 }

 void TestLogdChunkSplitter(const std::string& tag, const std::string& file,
                            const std::string& input,
                            const std::vector<std::string>& expected_output) {
   std::vector<std::string> output;
   auto logger_function = [&](LogId, LogSeverity, const char*, const char* msg) {
     output.push_back(msg);
   };

   SplitByLogdChunks(MAIN, FATAL, tag.c_str(), file.empty() ? nullptr : file.c_str(), 1000,
                     input.c_str(), logger_function);

   auto return_lengths = [&] {
     std::string sizes;
     sizes += "expected_output sizes:";
     for (const auto& string : expected_output) {
       sizes += " " + std::to_string(string.size());
     }
     sizes += "\noutput sizes:";
     for (const auto& string : output) {
       sizes += " " + std::to_string(string.size());
     }
     return sizes;
   };

   EXPECT_EQ(expected_output, output) << return_lengths();
 }

 TEST(logging_splitters, LogdChunkSplitter_EmptyString) {
   TestLogdChunkSplitter("tag", "", "", std::vector<std::string>{""});
 }

 TEST(logging_splitters, LogdChunkSplitter_BasicString) {
   TestLogdChunkSplitter("tag", "", "normal string", std::vector<std::string>{"normal string"});
 }

 TEST(logging_splitters, LogdChunkSplitter_NormalBasicStringTrailingNewline) {
   TestLogdChunkSplitter("tag", "", "normal string\n", std::vector<std::string>{"normal string\n"});
 }

 TEST(logging_splitters, LogdChunkSplitter_MultilineTrailing) {
   TestLogdChunkSplitter("tag", "", "normal string\nsecond string\nthirdstring",
                         std::vector<std::string>{"normal string\nsecond string\nthirdstring"});
 }

 TEST(logging_splitters, LogdChunkSplitter_MultilineTrailingNewline) {
   TestLogdChunkSplitter("tag", "", "normal string\nsecond string\nthirdstring\n",
                         std::vector<std::string>{"normal string\nsecond string\nthirdstring\n"});
 }

 TEST(logging_splitters, LogdChunkSplitter_MultilineEmbeddedNewlines) {
   TestLogdChunkSplitter(
       "tag", "", "normal string\n\n\nsecond string\n\nthirdstring\n",
       std::vector<std::string>{"normal string\n\n\nsecond string\n\nthirdstring\n"});
 }

 // This test should return the same string, the logd logger itself will truncate down to size.
 // This has historically been the behavior both in libbase and liblog.
 TEST(logging_splitters, LogdChunkSplitter_HugeLineNoNewline) {
   auto long_string = std::string(LOGGER_ENTRY_MAX_PAYLOAD, 'x');
   ASSERT_EQ(LOGGER_ENTRY_MAX_PAYLOAD, static_cast<int>(long_string.size()));

   TestLogdChunkSplitter("tag", "", long_string, std::vector{long_string});
 }

 std::string ReduceToMaxSize(const std::string& tag, const std::string& string) {
   return string.substr(0, LOGGER_ENTRY_MAX_PAYLOAD - tag.size() - 35);
 }

 TEST(logging_splitters, LogdChunkSplitter_MultipleHugeLineNoNewline) {
   auto long_string_x = std::string(LOGGER_ENTRY_MAX_PAYLOAD, 'x');
   auto long_string_y = std::string(LOGGER_ENTRY_MAX_PAYLOAD, 'y');
   auto long_string_z = std::string(LOGGER_ENTRY_MAX_PAYLOAD, 'z');

   auto long_strings = long_string_x + '\n' + long_string_y + '\n' + long_string_z;

   std::string tag = "tag";
   std::vector expected = {ReduceToMaxSize(tag, long_string_x), ReduceToMaxSize(tag, long_string_y),
                           long_string_z};

   TestLogdChunkSplitter(tag, "", long_strings, expected);
 }

 // With a ~4k buffer, we should print 2 long strings per logger call.
 TEST(logging_splitters, LogdChunkSplitter_Multiple2kLines) {
   std::vector expected = {
       std::string(2000, 'a') + '\n' + std::string(2000, 'b'),
       std::string(2000, 'c') + '\n' + std::string(2000, 'd'),
       std::string(2000, 'e') + '\n' + std::string(2000, 'f'),
   };

   auto long_strings = Join(expected, '\n');

   TestLogdChunkSplitter("tag", "", long_strings, expected);
 }

 TEST(logging_splitters, LogdChunkSplitter_ExactSizedLines) {
   const char* tag = "tag";
   ptrdiff_t max_size = LOGGER_ENTRY_MAX_PAYLOAD - strlen(tag) - 35;
   auto long_string_a = std::string(max_size, 'a');
   auto long_string_b = std::string(max_size, 'b');
   auto long_string_c = std::string(max_size, 'c');

   auto long_strings = long_string_a + '\n' + long_string_b + '\n' + long_string_c;

   TestLogdChunkSplitter(tag, "", long_strings,
                         std::vector{long_string_a, long_string_b, long_string_c});
 }

 TEST(logging_splitters, LogdChunkSplitter_UnderEqualOver) {
   std::string tag = "tag";
   ptrdiff_t max_size = LOGGER_ENTRY_MAX_PAYLOAD - tag.size() - 35;

   auto first_string_size = 1000;
   auto first_string = std::string(first_string_size, 'a');
   auto second_string_size = max_size - first_string_size - 1;
   auto second_string = std::string(second_string_size, 'b');

   auto exact_string = std::string(max_size, 'c');

   auto large_string = std::string(max_size + 50, 'd');

   auto final_string = std::string("final string!\n\nfinal \n \n final \n");

   std::vector expected = {first_string + '\n' + second_string, exact_string,
                           ReduceToMaxSize(tag, large_string), final_string};

   std::vector input_strings = {first_string + '\n' + second_string, exact_string, large_string,
                                final_string};
   auto long_strings = Join(input_strings, '\n');

   TestLogdChunkSplitter(tag, "", long_strings, expected);
 }

 TEST(logging_splitters, LogdChunkSplitter_WithFile) {
   std::string tag = "tag";
   std::string file = "/path/to/myfile.cpp";
   int line = 1000;
   auto file_header = StringPrintf("%s:%d] ", file.c_str(), line);
   ptrdiff_t max_size = LOGGER_ENTRY_MAX_PAYLOAD - tag.size() - 35;

   auto first_string_size = 1000;
   auto first_string = std::string(first_string_size, 'a');
   auto second_string_size = max_size - first_string_size - 1 - 2 * file_header.size();
   auto second_string = std::string(second_string_size, 'b');

   auto exact_string = std::string(max_size - file_header.size(), 'c');

   auto large_string = std::string(max_size + 50, 'd');

   auto final_string = std::string("final string!");

   std::vector expected = {
       file_header + first_string + '\n' + file_header + second_string, file_header + exact_string,
       file_header + ReduceToMaxSize(file_header + tag, large_string), file_header + final_string};

   std::vector input_strings = {first_string + '\n' + second_string, exact_string, large_string,
                                final_string};
   auto long_strings = Join(input_strings, '\n');

   TestLogdChunkSplitter(tag, file, long_strings, expected);
 }

 // We set max_size based off of tag, so if it's too large, the buffer will be sized wrong.
 // We could recover from this, but it's certainly an error for someone to attempt to use a tag this
 // large, so we abort instead.
 TEST(logging_splitters, LogdChunkSplitter_TooLongTag) {
   auto long_tag = std::string(5000, 'x');
   auto logger_function = [](LogId, LogSeverity, const char*, const char*) {};
   ASSERT_DEATH(
       SplitByLogdChunks(MAIN, ERROR, long_tag.c_str(), nullptr, 0, "message", logger_function), "");
 }

 // We do handle excessively large file names correctly however.
 TEST(logging_splitters, LogdChunkSplitter_TooLongFile) {
   auto long_file = std::string(5000, 'x');
   std::string tag = "tag";

   std::vector expected = {ReduceToMaxSize(tag, long_file), ReduceToMaxSize(tag, long_file)};

   TestLogdChunkSplitter(tag, long_file, "can't see me\nor me", expected);
 }

 void TestStderrOutputGenerator(const char* tag, const char* file, int line, const char* message,
                                const std::string& expected) {
   // All log messages will show "01-01 00:00:00"
   struct tm now = {
       .tm_sec = 0,
       .tm_min = 0,
       .tm_hour = 0,
       .tm_mday = 1,
       .tm_mon = 0,
       .tm_year = 1970,
   };

   int pid = 1234;       // All log messages will have 1234 for their PID.
   uint64_t tid = 4321;  // All log messages will have 4321 for their TID.

   auto result = StderrOutputGenerator(now, pid, tid, ERROR, tag, file, line, message);
   EXPECT_EQ(expected, result);
 }

 TEST(logging_splitters, StderrOutputGenerator_Basic) {
   TestStderrOutputGenerator(nullptr, nullptr, 0, "simple message",
                             "nullptr E 01-01 00:00:00  1234  4321 simple message\n");
   TestStderrOutputGenerator("tag", nullptr, 0, "simple message",
                             "tag E 01-01 00:00:00  1234  4321 simple message\n");
   TestStderrOutputGenerator(
       "tag", "/path/to/some/file", 0, "simple message",
       "tag E 01-01 00:00:00  1234  4321 /path/to/some/file:0] simple message\n");
 }

 TEST(logging_splitters, StderrOutputGenerator_NewlineTagAndFile) {
   TestStderrOutputGenerator("tag\n\n", nullptr, 0, "simple message",
                             "tag\n\n E 01-01 00:00:00  1234  4321 simple message\n");
   TestStderrOutputGenerator(
       "tag", "/path/to/some/file\n\n", 0, "simple message",
       "tag E 01-01 00:00:00  1234  4321 /path/to/some/file\n\n:0] simple message\n");
 }

 TEST(logging_splitters, StderrOutputGenerator_TrailingNewLine) {
   TestStderrOutputGenerator(
       "tag", nullptr, 0, "simple message\n",
       "tag E 01-01 00:00:00  1234  4321 simple message\ntag E 01-01 00:00:00  1234  4321 \n");
 }

 TEST(logging_splitters, StderrOutputGenerator_MultiLine) {
   const char* expected_result =
       "tag E 01-01 00:00:00  1234  4321 simple message\n"
       "tag E 01-01 00:00:00  1234  4321 \n"
       "tag E 01-01 00:00:00  1234  4321 \n"
       "tag E 01-01 00:00:00  1234  4321 another message \n"
       "tag E 01-01 00:00:00  1234  4321 \n"
       "tag E 01-01 00:00:00  1234  4321  final message \n"
       "tag E 01-01 00:00:00  1234  4321 \n"
       "tag E 01-01 00:00:00  1234  4321 \n"
       "tag E 01-01 00:00:00  1234  4321 \n";

   TestStderrOutputGenerator("tag", nullptr, 0,
                             "simple message\n\n\nanother message \n\n final message \n\n\n",
                             expected_result);
 }

 TEST(logging_splitters, StderrOutputGenerator_MultiLineLong) {
   auto long_string_a = std::string(4000, 'a');
   auto long_string_b = std::string(4000, 'b');

   auto message = long_string_a + '\n' + long_string_b;
   auto expected_result = "tag E 01-01 00:00:00  1234  4321 " + long_string_a + '\n' +
                          "tag E 01-01 00:00:00  1234  4321 " + long_string_b + '\n';
   TestStderrOutputGenerator("tag", nullptr, 0, message.c_str(), expected_result);
 }

 }  // namespace base
 }  // namespace android
	/*
	* Copyright (C) 2020 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "logging_splitters.h"

	#include <string>
	#include <vector>

	#include <android-base/strings.h>
	#include <gtest/gtest.h>

	namespace android {
	namespace base {

	void TestNewlineSplitter(const std::string& input,
	const std::vector<std::string>& expected_output) {
	std::vector<std::string> output;
	auto logger_function = [&](const char* msg, int length) {
	if (length == -1) {
	output.push_back(msg);
	} else {
	output.push_back(std::string(msg, length));
	}
	};
	SplitByLines(input.c_str(), logger_function);

	EXPECT_EQ(expected_output, output);
	}

	TEST(logging_splitters, NewlineSplitter_EmptyString) {
	TestNewlineSplitter("", std::vector<std::string>{""});
	}

	TEST(logging_splitters, NewlineSplitter_BasicString) {
	TestNewlineSplitter("normal string", std::vector<std::string>{"normal string"});
	}

	TEST(logging_splitters, NewlineSplitter_ormalBasicStringTrailingNewline) {
	TestNewlineSplitter("normal string\n", std::vector<std::string>{"normal string", ""});
	}

	TEST(logging_splitters, NewlineSplitter_MultilineTrailing) {
	TestNewlineSplitter("normal string\nsecond string\nthirdstring",
	std::vector<std::string>{"normal string", "second string", "thirdstring"});
	}

	TEST(logging_splitters, NewlineSplitter_MultilineTrailingNewline) {
	TestNewlineSplitter(
	"normal string\nsecond string\nthirdstring\n",
	std::vector<std::string>{"normal string", "second string", "thirdstring", ""});
	}

	TEST(logging_splitters, NewlineSplitter_MultilineEmbeddedNewlines) {
	TestNewlineSplitter(
	"normal string\n\n\nsecond string\n\nthirdstring\n",
	std::vector<std::string>{"normal string", "", "", "second string", "", "thirdstring", ""});
	}

	void TestLogdChunkSplitter(const std::string& tag, const std::string& file,
	const std::string& input,
	const std::vector<std::string>& expected_output) {
	std::vector<std::string> output;
	auto logger_function = [&](LogId, LogSeverity, const char, const char msg) {
	output.push_back(msg);
	};

	SplitByLogdChunks(MAIN, FATAL, tag.c_str(), file.empty() ? nullptr : file.c_str(), 1000,
	input.c_str(), logger_function);

	auto return_lengths = [&] {
	std::string sizes;
	sizes += "expected_output sizes:";
	for (const auto& string : expected_output) {
	sizes += " " + std::to_string(string.size());
	}
	sizes += "\noutput sizes:";
	for (const auto& string : output) {
	sizes += " " + std::to_string(string.size());
	}
	return sizes;
	};

	EXPECT_EQ(expected_output, output) << return_lengths();
	}

	TEST(logging_splitters, LogdChunkSplitter_EmptyString) {
	TestLogdChunkSplitter("tag", "", "", std::vector<std::string>{""});
	}

	TEST(logging_splitters, LogdChunkSplitter_BasicString) {
	TestLogdChunkSplitter("tag", "", "normal string", std::vector<std::string>{"normal string"});
	}

	TEST(logging_splitters, LogdChunkSplitter_NormalBasicStringTrailingNewline) {
	TestLogdChunkSplitter("tag", "", "normal string\n", std::vector<std::string>{"normal string\n"});
	}

	TEST(logging_splitters, LogdChunkSplitter_MultilineTrailing) {
	TestLogdChunkSplitter("tag", "", "normal string\nsecond string\nthirdstring",
	std::vector<std::string>{"normal string\nsecond string\nthirdstring"});
	}

	TEST(logging_splitters, LogdChunkSplitter_MultilineTrailingNewline) {
	TestLogdChunkSplitter("tag", "", "normal string\nsecond string\nthirdstring\n",
	std::vector<std::string>{"normal string\nsecond string\nthirdstring\n"});
	}

	TEST(logging_splitters, LogdChunkSplitter_MultilineEmbeddedNewlines) {
	TestLogdChunkSplitter(
	"tag", "", "normal string\n\n\nsecond string\n\nthirdstring\n",
	std::vector<std::string>{"normal string\n\n\nsecond string\n\nthirdstring\n"});
	}

	// This test should return the same string, the logd logger itself will truncate down to size.
	// This has historically been the behavior both in libbase and liblog.
	TEST(logging_splitters, LogdChunkSplitter_HugeLineNoNewline) {
	auto long_string = std::string(LOGGER_ENTRY_MAX_PAYLOAD, 'x');
	ASSERT_EQ(LOGGER_ENTRY_MAX_PAYLOAD, static_cast<int>(long_string.size()));

	TestLogdChunkSplitter("tag", "", long_string, std::vector{long_string});
	}

	std::string ReduceToMaxSize(const std::string& tag, const std::string& string) {
	return string.substr(0, LOGGER_ENTRY_MAX_PAYLOAD - tag.size() - 35);
	}

	TEST(logging_splitters, LogdChunkSplitter_MultipleHugeLineNoNewline) {
	auto long_string_x = std::string(LOGGER_ENTRY_MAX_PAYLOAD, 'x');
	auto long_string_y = std::string(LOGGER_ENTRY_MAX_PAYLOAD, 'y');
	auto long_string_z = std::string(LOGGER_ENTRY_MAX_PAYLOAD, 'z');

	auto long_strings = long_string_x + '\n' + long_string_y + '\n' + long_string_z;

	std::string tag = "tag";
	std::vector expected = {ReduceToMaxSize(tag, long_string_x), ReduceToMaxSize(tag, long_string_y),
	long_string_z};

	TestLogdChunkSplitter(tag, "", long_strings, expected);
	}

	// With a ~4k buffer, we should print 2 long strings per logger call.
	TEST(logging_splitters, LogdChunkSplitter_Multiple2kLines) {
	std::vector expected = {
	std::string(2000, 'a') + '\n' + std::string(2000, 'b'),
	std::string(2000, 'c') + '\n' + std::string(2000, 'd'),
	std::string(2000, 'e') + '\n' + std::string(2000, 'f'),
	};

	auto long_strings = Join(expected, '\n');

	TestLogdChunkSplitter("tag", "", long_strings, expected);
	}

	TEST(logging_splitters, LogdChunkSplitter_ExactSizedLines) {
	const char* tag = "tag";
	ptrdiff_t max_size = LOGGER_ENTRY_MAX_PAYLOAD - strlen(tag) - 35;
	auto long_string_a = std::string(max_size, 'a');
	auto long_string_b = std::string(max_size, 'b');
	auto long_string_c = std::string(max_size, 'c');

	auto long_strings = long_string_a + '\n' + long_string_b + '\n' + long_string_c;

	TestLogdChunkSplitter(tag, "", long_strings,
	std::vector{long_string_a, long_string_b, long_string_c});
	}

	TEST(logging_splitters, LogdChunkSplitter_UnderEqualOver) {
	std::string tag = "tag";
	ptrdiff_t max_size = LOGGER_ENTRY_MAX_PAYLOAD - tag.size() - 35;

	auto first_string_size = 1000;
	auto first_string = std::string(first_string_size, 'a');
	auto second_string_size = max_size - first_string_size - 1;
	auto second_string = std::string(second_string_size, 'b');

	auto exact_string = std::string(max_size, 'c');

	auto large_string = std::string(max_size + 50, 'd');

	auto final_string = std::string("final string!\n\nfinal \n \n final \n");

	std::vector expected = {first_string + '\n' + second_string, exact_string,
	ReduceToMaxSize(tag, large_string), final_string};

	std::vector input_strings = {first_string + '\n' + second_string, exact_string, large_string,
	final_string};
	auto long_strings = Join(input_strings, '\n');

	TestLogdChunkSplitter(tag, "", long_strings, expected);
	}

	TEST(logging_splitters, LogdChunkSplitter_WithFile) {
	std::string tag = "tag";
	std::string file = "/path/to/myfile.cpp";
	int line = 1000;
	auto file_header = StringPrintf("%s:%d] ", file.c_str(), line);
	ptrdiff_t max_size = LOGGER_ENTRY_MAX_PAYLOAD - tag.size() - 35;

	auto first_string_size = 1000;
	auto first_string = std::string(first_string_size, 'a');
	auto second_string_size = max_size - first_string_size - 1 - 2 * file_header.size();
	auto second_string = std::string(second_string_size, 'b');

	auto exact_string = std::string(max_size - file_header.size(), 'c');

	auto large_string = std::string(max_size + 50, 'd');

	auto final_string = std::string("final string!");

	std::vector expected = {
	file_header + first_string + '\n' + file_header + second_string, file_header + exact_string,
	file_header + ReduceToMaxSize(file_header + tag, large_string), file_header + final_string};

	std::vector input_strings = {first_string + '\n' + second_string, exact_string, large_string,
	final_string};
	auto long_strings = Join(input_strings, '\n');

	TestLogdChunkSplitter(tag, file, long_strings, expected);
	}

	// We set max_size based off of tag, so if it's too large, the buffer will be sized wrong.
	// We could recover from this, but it's certainly an error for someone to attempt to use a tag this
	// large, so we abort instead.
	TEST(logging_splitters, LogdChunkSplitter_TooLongTag) {
	auto long_tag = std::string(5000, 'x');
	auto logger_function = [](LogId, LogSeverity, const char, const char) {};
	ASSERT_DEATH(
	SplitByLogdChunks(MAIN, ERROR, long_tag.c_str(), nullptr, 0, "message", logger_function), "");
	}

	// We do handle excessively large file names correctly however.
	TEST(logging_splitters, LogdChunkSplitter_TooLongFile) {
	auto long_file = std::string(5000, 'x');
	std::string tag = "tag";

	std::vector expected = {ReduceToMaxSize(tag, long_file), ReduceToMaxSize(tag, long_file)};

	TestLogdChunkSplitter(tag, long_file, "can't see me\nor me", expected);
	}

	void TestStderrOutputGenerator(const char* tag, const char* file, int line, const char* message,
	const std::string& expected) {
	// All log messages will show "01-01 00:00:00"
	struct tm now = {
	.tm_sec = 0,
	.tm_min = 0,
	.tm_hour = 0,
	.tm_mday = 1,
	.tm_mon = 0,
	.tm_year = 1970,
	};

	int pid = 1234; // All log messages will have 1234 for their PID.
	uint64_t tid = 4321; // All log messages will have 4321 for their TID.

	auto result = StderrOutputGenerator(now, pid, tid, ERROR, tag, file, line, message);
	EXPECT_EQ(expected, result);
	}

	TEST(logging_splitters, StderrOutputGenerator_Basic) {
	TestStderrOutputGenerator(nullptr, nullptr, 0, "simple message",
	"nullptr E 01-01 00:00:00 1234 4321 simple message\n");
	TestStderrOutputGenerator("tag", nullptr, 0, "simple message",
	"tag E 01-01 00:00:00 1234 4321 simple message\n");
	TestStderrOutputGenerator(
	"tag", "/path/to/some/file", 0, "simple message",
	"tag E 01-01 00:00:00 1234 4321 /path/to/some/file:0] simple message\n");
	}

	TEST(logging_splitters, StderrOutputGenerator_NewlineTagAndFile) {
	TestStderrOutputGenerator("tag\n\n", nullptr, 0, "simple message",
	"tag\n\n E 01-01 00:00:00 1234 4321 simple message\n");
	TestStderrOutputGenerator(
	"tag", "/path/to/some/file\n\n", 0, "simple message",
	"tag E 01-01 00:00:00 1234 4321 /path/to/some/file\n\n:0] simple message\n");
	}

	TEST(logging_splitters, StderrOutputGenerator_TrailingNewLine) {
	TestStderrOutputGenerator(
	"tag", nullptr, 0, "simple message\n",
	"tag E 01-01 00:00:00 1234 4321 simple message\ntag E 01-01 00:00:00 1234 4321 \n");
	}

	TEST(logging_splitters, StderrOutputGenerator_MultiLine) {
	const char* expected_result =
	"tag E 01-01 00:00:00 1234 4321 simple message\n"
	"tag E 01-01 00:00:00 1234 4321 \n"
	"tag E 01-01 00:00:00 1234 4321 \n"
	"tag E 01-01 00:00:00 1234 4321 another message \n"
	"tag E 01-01 00:00:00 1234 4321 \n"
	"tag E 01-01 00:00:00 1234 4321 final message \n"
	"tag E 01-01 00:00:00 1234 4321 \n"
	"tag E 01-01 00:00:00 1234 4321 \n"
	"tag E 01-01 00:00:00 1234 4321 \n";

	TestStderrOutputGenerator("tag", nullptr, 0,
	"simple message\n\n\nanother message \n\n final message \n\n\n",
	expected_result);
	}

	TEST(logging_splitters, StderrOutputGenerator_MultiLineLong) {
	auto long_string_a = std::string(4000, 'a');
	auto long_string_b = std::string(4000, 'b');

	auto message = long_string_a + '\n' + long_string_b;
	auto expected_result = "tag E 01-01 00:00:00 1234 4321 " + long_string_a + '\n' +
	"tag E 01-01 00:00:00 1234 4321 " + long_string_b + '\n';
	TestStderrOutputGenerator("tag", nullptr, 0, message.c_str(), expected_result);
	}

	} // namespace base
	} // namespace android