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// Copyright 2005, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Author: wan@google.com (Zhanyong Wan)
//
// The Google C++ Testing Framework (Google Test)
//
// This header file defines the public API for death tests. It is
// #included by gtest.h so a user doesn't need to include this
// directly.
#ifndef GTEST_INCLUDE_GTEST_GTEST_DEATH_TEST_H_
#define GTEST_INCLUDE_GTEST_GTEST_DEATH_TEST_H_
#include <gtest/internal/gtest-death-test-internal.h>
namespace testing {
// This flag controls the style of death tests. Valid values are "threadsafe",
// meaning that the death test child process will re-execute the test binary
// from the start, running only a single death test, or "fast",
// meaning that the child process will execute the test logic immediately
// after forking.
GTEST_DECLARE_string(death_test_style);
#ifdef GTEST_HAS_DEATH_TEST
// The following macros are useful for writing death tests.
// Here's what happens when an ASSERT_DEATH* or EXPECT_DEATH* is
// executed:
//
// 1. The assertion fails immediately if there are more than one
// active threads. This is because it's safe to fork() only when
// there is a single thread.
//
// 2. The parent process forks a sub-process and runs the death test
// in it; the sub-process exits with code 0 at the end of the death
// test, if it hasn't exited already.
//
// 3. The parent process waits for the sub-process to terminate.
//
// 4. The parent process checks the exit code and error message of
// the sub-process.
//
// Note:
//
// It's not safe to call exit() if the current process is forked from
// a multi-threaded process, so people usually call _exit() instead in
// such a case. However, we are not concerned with this as we run
// death tests only when there is a single thread. Since exit() has a
// cleaner semantics (it also calls functions registered with atexit()
// and on_exit()), this macro calls exit() instead of _exit() to
// terminate the child process.
//
// Examples:
//
// ASSERT_DEATH(server.SendMessage(56, "Hello"), "Invalid port number");
// for (int i = 0; i < 5; i++) {
// EXPECT_DEATH(server.ProcessRequest(i),
// "Invalid request .* in ProcessRequest()")
// << "Failed to die on request " << i);
// }
//
// ASSERT_EXIT(server.ExitNow(), ::testing::ExitedWithCode(0), "Exiting");
//
// bool KilledBySIGHUP(int exit_code) {
// return WIFSIGNALED(exit_code) && WTERMSIG(exit_code) == SIGHUP;
// }
//
// ASSERT_EXIT(client.HangUpServer(), KilledBySIGHUP, "Hanging up!");
// Asserts that a given statement causes the program to exit, with an
// integer exit status that satisfies predicate, and emitting error output
// that matches regex.
#define ASSERT_EXIT(statement, predicate, regex) \
GTEST_DEATH_TEST(statement, predicate, regex, GTEST_FATAL_FAILURE)
// Like ASSERT_EXIT, but continues on to successive tests in the
// test case, if any:
#define EXPECT_EXIT(statement, predicate, regex) \
GTEST_DEATH_TEST(statement, predicate, regex, GTEST_NONFATAL_FAILURE)
// Asserts that a given statement causes the program to exit, either by
// explicitly exiting with a nonzero exit code or being killed by a
// signal, and emitting error output that matches regex.
#define ASSERT_DEATH(statement, regex) \
ASSERT_EXIT(statement, ::testing::internal::ExitedUnsuccessfully, regex)
// Like ASSERT_DEATH, but continues on to successive tests in the
// test case, if any:
#define EXPECT_DEATH(statement, regex) \
EXPECT_EXIT(statement, ::testing::internal::ExitedUnsuccessfully, regex)
// Two predicate classes that can be used in {ASSERT,EXPECT}_EXIT*:
// Tests that an exit code describes a normal exit with a given exit code.
class ExitedWithCode {
public:
explicit ExitedWithCode(int exit_code);
bool operator()(int exit_status) const;
private:
const int exit_code_;
};
// Tests that an exit code describes an exit due to termination by a
// given signal.
class KilledBySignal {
public:
explicit KilledBySignal(int signum);
bool operator()(int exit_status) const;
private:
const int signum_;
};
// EXPECT_DEBUG_DEATH asserts that the given statements die in debug mode.
// The death testing framework causes this to have interesting semantics,
// since the sideeffects of the call are only visible in opt mode, and not
// in debug mode.
//
// In practice, this can be used to test functions that utilize the
// LOG(DFATAL) macro using the following style:
//
// int DieInDebugOr12(int* sideeffect) {
// if (sideeffect) {
// *sideeffect = 12;
// }
// LOG(DFATAL) << "death";
// return 12;
// }
//
// TEST(TestCase, TestDieOr12WorksInDgbAndOpt) {
// int sideeffect = 0;
// // Only asserts in dbg.
// EXPECT_DEBUG_DEATH(DieInDebugOr12(&sideeffect), "death");
//
// #ifdef NDEBUG
// // opt-mode has sideeffect visible.
// EXPECT_EQ(12, sideeffect);
// #else
// // dbg-mode no visible sideeffect.
// EXPECT_EQ(0, sideeffect);
// #endif
// }
//
// This will assert that DieInDebugReturn12InOpt() crashes in debug
// mode, usually due to a DCHECK or LOG(DFATAL), but returns the
// appropriate fallback value (12 in this case) in opt mode. If you
// need to test that a function has appropriate side-effects in opt
// mode, include assertions against the side-effects. A general
// pattern for this is:
//
// EXPECT_DEBUG_DEATH({
// // Side-effects here will have an effect after this statement in
// // opt mode, but none in debug mode.
// EXPECT_EQ(12, DieInDebugOr12(&sideeffect));
// }, "death");
//
#ifdef NDEBUG
#define EXPECT_DEBUG_DEATH(statement, regex) \
do { statement; } while (false)
#define ASSERT_DEBUG_DEATH(statement, regex) \
do { statement; } while (false)
#else
#define EXPECT_DEBUG_DEATH(statement, regex) \
EXPECT_DEATH(statement, regex)
#define ASSERT_DEBUG_DEATH(statement, regex) \
ASSERT_DEATH(statement, regex)
#endif // NDEBUG for EXPECT_DEBUG_DEATH
#endif // GTEST_HAS_DEATH_TEST
} // namespace testing
#endif // GTEST_INCLUDE_GTEST_GTEST_DEATH_TEST_H_
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