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// Author: wan@google.com (Zhanyong Wan)

//

// Tests that Google Test manipulates the premature-exit-detection

// file correctly.

#include <stdio.h>

#include "gtest/gtest.h"

using ::testing::InitGoogleTest;

using ::testing::Test;

using ::testing::internal::posix::GetEnv;

using ::testing::internal::posix::Stat;

using ::testing::internal::posix::StatStruct;

namespace {

class PrematureExitTest : public Test {

 public:

  // Returns true iff the given file exists.

  static bool FileExists(const char* filepath) {

    StatStruct stat;

    return Stat(filepath, &stat) == 0;

  }

 protected:

  PrematureExitTest() {

    premature_exit_file_path_ = GetEnv("TEST_PREMATURE_EXIT_FILE");

    // Normalize NULL to "" for ease of handling.

    if (premature_exit_file_path_ == NULL) {

      premature_exit_file_path_ = "";

    }

  }

  // Returns true iff the premature-exit file exists.

  bool PrematureExitFileExists() const {

    return FileExists(premature_exit_file_path_);

  }

  const char* premature_exit_file_path_;

};

typedef PrematureExitTest PrematureExitDeathTest;

// Tests that:

//   - the premature-exit file exists during the execution of a

//     death test (EXPECT_DEATH*), and

//   - a death test doesn't interfere with the main test process's

//     handling of the premature-exit file.

TEST_F(PrematureExitDeathTest, FileExistsDuringExecutionOfDeathTest) {

  if (*premature_exit_file_path_ == '\0') {

    return;

  }

  EXPECT_DEATH_IF_SUPPORTED({

      // If the file exists, crash the process such that the main test

      // process will catch the (expected) crash and report a success;

      // otherwise don't crash, which will cause the main test process

      // to report that the death test has failed.

      if (PrematureExitFileExists()) {

        exit(1);

      }

    }, "");

}

// Tests that the premature-exit file exists during the execution of a

// normal (non-death) test.

TEST_F(PrematureExitTest, PrematureExitFileExistsDuringTestExecution) {

  if (*premature_exit_file_path_ == '\0') {

    return;

  }

  EXPECT_TRUE(PrematureExitFileExists())

      << " file " << premature_exit_file_path_

      << " should exist during test execution, but doesn't.";

}

}  // namespace

int main(int argc, char **argv) {

  InitGoogleTest(&argc, argv);

  const int exit_code = RUN_ALL_TESTS();

  // Test that the premature-exit file is deleted upon return from

  // RUN_ALL_TESTS().

  const char* const filepath = GetEnv("TEST_PREMATURE_EXIT_FILE");

  if (filepath != NULL && *filepath != '\0') {

    if (PrematureExitTest::FileExists(filepath)) {

      printf(

          "File %s shouldn't exist after the test program finishes, but does.",

          filepath);

      return 1;

    }

  }

  return exit_code;

}