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29//
30// Author: wan@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
39using ::testing::InitGoogleTest;
40using ::testing::Test;
41using ::testing::internal::posix::GetEnv;
42using ::testing::internal::posix::Stat;
43using ::testing::internal::posix::StatStruct;
44
45namespace {
46
47// Is the TEST_PREMATURE_EXIT_FILE environment variable expected to be
48// set?
49const bool kTestPrematureExitFileEnvVarShouldBeSet = false;
50
51class PrematureExitTest : public Test {
52 public:
53  // Returns true iff the given file exists.
54  static bool FileExists(const char* filepath) {
55    StatStruct stat;
56    return Stat(filepath, &stat) == 0;
57  }
58
59 protected:
60  PrematureExitTest() {
61    premature_exit_file_path_ = GetEnv("TEST_PREMATURE_EXIT_FILE");
62
63    // Normalize NULL to "" for ease of handling.
64    if (premature_exit_file_path_ == NULL) {
65      premature_exit_file_path_ = "";
66    }
67  }
68
69  // Returns true iff the premature-exit file exists.
70  bool PrematureExitFileExists() const {
71    return FileExists(premature_exit_file_path_);
72  }
73
74  const char* premature_exit_file_path_;
75};
76
77typedef PrematureExitTest PrematureExitDeathTest;
78
79// Tests that:
80//   - the premature-exit file exists during the execution of a
81//     death test (EXPECT_DEATH*), and
82//   - a death test doesn't interfere with the main test process's
83//     handling of the premature-exit file.
84TEST_F(PrematureExitDeathTest, FileExistsDuringExecutionOfDeathTest) {
85  if (*premature_exit_file_path_ == '\0') {
86    return;
87  }
88
89  EXPECT_DEATH_IF_SUPPORTED({
90      // If the file exists, crash the process such that the main test
91      // process will catch the (expected) crash and report a success;
92      // otherwise don't crash, which will cause the main test process
93      // to report that the death test has failed.
94      if (PrematureExitFileExists()) {
95        exit(1);
96      }
97    }, "");
98}
99
100// Tests that TEST_PREMATURE_EXIT_FILE is set where it's expected to
101// be set.
102TEST_F(PrematureExitTest, TestPrematureExitFileEnvVarIsSet) {
103  if (kTestPrematureExitFileEnvVarShouldBeSet) {
104    const char* const filepath = GetEnv("TEST_PREMATURE_EXIT_FILE");
105    ASSERT_TRUE(filepath != NULL);
106    ASSERT_NE(*filepath, '\0');
107  }
108}
109
110// Tests that the premature-exit file exists during the execution of a
111// normal (non-death) test.
112TEST_F(PrematureExitTest, PrematureExitFileExistsDuringTestExecution) {
113  if (*premature_exit_file_path_ == '\0') {
114    return;
115  }
116
117  EXPECT_TRUE(PrematureExitFileExists())
118      << " file " << premature_exit_file_path_
119      << " should exist during test execution, but doesn't.";
120}
121
122}  // namespace
123
124int main(int argc, char **argv) {
125  InitGoogleTest(&argc, argv);
126  const int exit_code = RUN_ALL_TESTS();
127
128  // Test that the premature-exit file is deleted upon return from
129  // RUN_ALL_TESTS().
130  const char* const filepath = GetEnv("TEST_PREMATURE_EXIT_FILE");
131  if (filepath != NULL && *filepath != '\0') {
132    if (PrematureExitTest::FileExists(filepath)) {
133      printf(
134          "File %s shouldn't exist after the test program finishes, but does.",
135          filepath);
136      return 1;
137    }
138  }
139
140  return exit_code;
141}
142