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     29 //
     30 // Author: wan (at) google.com (Zhanyong Wan)
     31 //
     32 // Tests that Google Test manipulates the premature-exit-detection
     33 // file correctly.
     34 
     35 #include <stdio.h>
     36 
     37 #include "gtest/gtest.h"
     38 
     39 using ::testing::InitGoogleTest;
     40 using ::testing::Test;
     41 using ::testing::internal::posix::GetEnv;
     42 using ::testing::internal::posix::Stat;
     43 using ::testing::internal::posix::StatStruct;
     44 
     45 namespace {
     46 
     47 class PrematureExitTest : public Test {
     48  public:
     49   // Returns true iff the given file exists.
     50   static bool FileExists(const char* filepath) {
     51     StatStruct stat;
     52     return Stat(filepath, &stat) == 0;
     53   }
     54 
     55  protected:
     56   PrematureExitTest() {
     57     premature_exit_file_path_ = GetEnv("TEST_PREMATURE_EXIT_FILE");
     58 
     59     // Normalize NULL to "" for ease of handling.
     60     if (premature_exit_file_path_ == NULL) {
     61       premature_exit_file_path_ = "";
     62     }
     63   }
     64 
     65   // Returns true iff the premature-exit file exists.
     66   bool PrematureExitFileExists() const {
     67     return FileExists(premature_exit_file_path_);
     68   }
     69 
     70   const char* premature_exit_file_path_;
     71 };
     72 
     73 typedef PrematureExitTest PrematureExitDeathTest;
     74 
     75 // Tests that:
     76 //   - the premature-exit file exists during the execution of a
     77 //     death test (EXPECT_DEATH*), and
     78 //   - a death test doesn't interfere with the main test process's
     79 //     handling of the premature-exit file.
     80 TEST_F(PrematureExitDeathTest, FileExistsDuringExecutionOfDeathTest) {
     81   if (*premature_exit_file_path_ == '\0') {
     82     return;
     83   }
     84 
     85   EXPECT_DEATH_IF_SUPPORTED({
     86       // If the file exists, crash the process such that the main test
     87       // process will catch the (expected) crash and report a success;
     88       // otherwise don't crash, which will cause the main test process
     89       // to report that the death test has failed.
     90       if (PrematureExitFileExists()) {
     91         exit(1);
     92       }
     93     }, "");
     94 }
     95 
     96 // Tests that the premature-exit file exists during the execution of a
     97 // normal (non-death) test.
     98 TEST_F(PrematureExitTest, PrematureExitFileExistsDuringTestExecution) {
     99   if (*premature_exit_file_path_ == '\0') {
    100     return;
    101   }
    102 
    103   EXPECT_TRUE(PrematureExitFileExists())
    104       << " file " << premature_exit_file_path_
    105       << " should exist during test execution, but doesn't.";
    106 }
    107 
    108 }  // namespace
    109 
    110 int main(int argc, char **argv) {
    111   InitGoogleTest(&argc, argv);
    112   const int exit_code = RUN_ALL_TESTS();
    113 
    114   // Test that the premature-exit file is deleted upon return from
    115   // RUN_ALL_TESTS().
    116   const char* const filepath = GetEnv("TEST_PREMATURE_EXIT_FILE");
    117   if (filepath != NULL && *filepath != '\0') {
    118     if (PrematureExitTest::FileExists(filepath)) {
    119       printf(
    120           "File %s shouldn't exist after the test program finishes, but does.",
    121           filepath);
    122       return 1;
    123     }
    124   }
    125 
    126   return exit_code;
    127 }
    128