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// 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);

#if 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. It generates a warning if there is more than one active

//   thread.  This is because it's safe to fork() or clone() only

//   when there is a single thread.

//

//   2. The parent process clone()s 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.

//

// 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!");

//

// On the regular expressions used in death tests:

//

//   On POSIX-compliant systems (*nix), we use the  library,

//   which uses the POSIX extended regex syntax.

//

//   On other platforms (e.g. Windows), we only support a simple regex

//   syntax implemented as part of Google Test.  This limited

//   implementation should be enough most of the time when writing

//   death tests; though it lacks many features you can find in PCRE

//   or POSIX extended regex syntax.  For example, we don't support

//   union ("x|y"), grouping ("(xy)"), brackets ("[xy]"), and

//   repetition count ("x{5,7}"), among others.

//

//   Below is the syntax that we do support.  We chose it to be a

//   subset of both PCRE and POSIX extended regex, so it's easy to

//   learn wherever you come from.  In the following: 'A' denotes a

//   literal character, period (.), or a single \\ escape sequence;

//   'x' and 'y' denote regular expressions; 'm' and 'n' are for

//   natural numbers.

//

//     c     matches any literal character c

//     \\d   matches any decimal digit

//     \\D   matches any character that's not a decimal digit

//     \\f   matches \f

//     \\n   matches \n

//     \\r   matches \r

//     \\s   matches any ASCII whitespace, including \n

//     \\S   matches any character that's not a whitespace

//     \\t   matches \t

//     \\v   matches \v

//     \\w   matches any letter, _, or decimal digit

//     \\W   matches any character that \\w doesn't match

//     \\c   matches any literal character c, which must be a punctuation

//     .     matches any single character except \n

//     A?    matches 0 or 1 occurrences of A

//     A*    matches 0 or many occurrences of A

//     A+    matches 1 or many occurrences of A

//     ^     matches the beginning of a string (not that of each line)

//     $     matches the end of a string (not that of each line)

//     xy    matches x followed by y

//

//   If you accidentally use PCRE or POSIX extended regex features

//   not implemented by us, you will get a run-time failure.  In that

//   case, please try to rewrite your regular expression within the

//   above syntax.

//

//   This implementation is *not* meant to be as highly tuned or robust

//   as a compiled regex library, but should perform well enough for a

//   death test, which already incurs significant overhead by launching

//   a child process.

//

// Known caveats:

//

//   A "threadsafe" style death test obtains the path to the test

//   program from argv[0] and re-executes it in the sub-process.  For

//   simplicity, the current implementation doesn't search the PATH

//   when launching the sub-process.  This means that the user must

//   invoke the test program via a path that contains at least one

//   path separator (e.g. path/to/foo_test and

//   /absolute/path/to/bar_test are fine, but foo_test is not).  This

//   is rarely a problem as people usually don't put the test binary

//   directory in PATH.

//

// TODO(wan@google.com): make thread-safe death tests search the PATH.

// 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 GTEST_API_ ExitedWithCode {

 public:

  explicit ExitedWithCode(int exit_code);

  bool operator()(int exit_status) const;

 private:

  // No implementation - assignment is unsupported.

  void operator=(const ExitedWithCode& other);

  const int exit_code_;

};

# if !GTEST_OS_WINDOWS

// Tests that an exit code describes an exit due to termination by a

// given signal.

class GTEST_API_ KilledBySignal {

 public:

  explicit KilledBySignal(int signum);

  bool operator()(int exit_status) const;

 private:

  const int signum_;

};

# endif  // !GTEST_OS_WINDOWS

// 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 (::testing::internal::AlwaysFalse())

#  define ASSERT_DEBUG_DEATH(statement, regex) \

  do { statement; } while (::testing::internal::AlwaysFalse())

# 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

// EXPECT_DEATH_IF_SUPPORTED(statement, regex) and

// ASSERT_DEATH_IF_SUPPORTED(statement, regex) expand to real death tests if

// death tests are supported; otherwise they just issue a warning.  This is

// useful when you are combining death test assertions with normal test

// assertions in one test.

#if GTEST_HAS_DEATH_TEST

# define EXPECT_DEATH_IF_SUPPORTED(statement, regex) \

    EXPECT_DEATH(statement, regex)

# define ASSERT_DEATH_IF_SUPPORTED(statement, regex) \

    ASSERT_DEATH(statement, regex)

#else

# define EXPECT_DEATH_IF_SUPPORTED(statement, regex) \

    GTEST_UNSUPPORTED_DEATH_TEST_(statement, regex, )

# define ASSERT_DEATH_IF_SUPPORTED(statement, regex) \

    GTEST_UNSUPPORTED_DEATH_TEST_(statement, regex, return)

#endif

}  // namespace testing

#endif  // GTEST_INCLUDE_GTEST_GTEST_DEATH_TEST_H_