Mercurial > embed
annotate libgtest/include/gtest/gtest-death-test.h @ 76:0bd0077049ff
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author | David Demelier <markand@malikania.fr> |
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date | Fri, 23 Nov 2018 21:43:06 +0100 |
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1 // Copyright 2005, Google Inc. |
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2 // All rights reserved. |
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3 // |
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4 // Redistribution and use in source and binary forms, with or without |
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5 // modification, are permitted provided that the following conditions are |
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6 // met: |
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7 // |
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8 // * Redistributions of source code must retain the above copyright |
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9 // notice, this list of conditions and the following disclaimer. |
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10 // * Redistributions in binary form must reproduce the above |
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11 // copyright notice, this list of conditions and the following disclaimer |
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12 // in the documentation and/or other materials provided with the |
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13 // distribution. |
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14 // * Neither the name of Google Inc. nor the names of its |
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15 // contributors may be used to endorse or promote products derived from |
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16 // this software without specific prior written permission. |
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17 // |
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18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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29 // |
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30 // Author: wan@google.com (Zhanyong Wan) |
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31 // |
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32 // The Google C++ Testing Framework (Google Test) |
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33 // |
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34 // This header file defines the public API for death tests. It is |
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35 // #included by gtest.h so a user doesn't need to include this |
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36 // directly. |
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37 |
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38 #ifndef GTEST_INCLUDE_GTEST_GTEST_DEATH_TEST_H_ |
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39 #define GTEST_INCLUDE_GTEST_GTEST_DEATH_TEST_H_ |
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40 |
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41 #include "gtest/internal/gtest-death-test-internal.h" |
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42 |
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43 namespace testing { |
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44 |
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45 // This flag controls the style of death tests. Valid values are "threadsafe", |
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46 // meaning that the death test child process will re-execute the test binary |
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47 // from the start, running only a single death test, or "fast", |
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48 // meaning that the child process will execute the test logic immediately |
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49 // after forking. |
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50 GTEST_DECLARE_string_(death_test_style); |
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51 |
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52 #if GTEST_HAS_DEATH_TEST |
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53 |
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54 namespace internal { |
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55 |
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56 // Returns a Boolean value indicating whether the caller is currently |
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57 // executing in the context of the death test child process. Tools such as |
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58 // Valgrind heap checkers may need this to modify their behavior in death |
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59 // tests. IMPORTANT: This is an internal utility. Using it may break the |
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60 // implementation of death tests. User code MUST NOT use it. |
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61 GTEST_API_ bool InDeathTestChild(); |
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62 |
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63 } // namespace internal |
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64 |
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65 // The following macros are useful for writing death tests. |
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66 |
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67 // Here's what happens when an ASSERT_DEATH* or EXPECT_DEATH* is |
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68 // executed: |
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69 // |
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70 // 1. It generates a warning if there is more than one active |
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71 // thread. This is because it's safe to fork() or clone() only |
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72 // when there is a single thread. |
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73 // |
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74 // 2. The parent process clone()s a sub-process and runs the death |
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75 // test in it; the sub-process exits with code 0 at the end of the |
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76 // death test, if it hasn't exited already. |
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77 // |
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78 // 3. The parent process waits for the sub-process to terminate. |
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79 // |
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80 // 4. The parent process checks the exit code and error message of |
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81 // the sub-process. |
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82 // |
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83 // Examples: |
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84 // |
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85 // ASSERT_DEATH(server.SendMessage(56, "Hello"), "Invalid port number"); |
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86 // for (int i = 0; i < 5; i++) { |
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87 // EXPECT_DEATH(server.ProcessRequest(i), |
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88 // "Invalid request .* in ProcessRequest()") |
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89 // << "Failed to die on request " << i; |
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90 // } |
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91 // |
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92 // ASSERT_EXIT(server.ExitNow(), ::testing::ExitedWithCode(0), "Exiting"); |
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93 // |
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94 // bool KilledBySIGHUP(int exit_code) { |
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95 // return WIFSIGNALED(exit_code) && WTERMSIG(exit_code) == SIGHUP; |
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96 // } |
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97 // |
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98 // ASSERT_EXIT(client.HangUpServer(), KilledBySIGHUP, "Hanging up!"); |
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99 // |
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100 // On the regular expressions used in death tests: |
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101 // |
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102 // On POSIX-compliant systems (*nix), we use the <regex.h> library, |
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103 // which uses the POSIX extended regex syntax. |
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104 // |
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105 // On other platforms (e.g. Windows), we only support a simple regex |
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106 // syntax implemented as part of Google Test. This limited |
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107 // implementation should be enough most of the time when writing |
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108 // death tests; though it lacks many features you can find in PCRE |
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109 // or POSIX extended regex syntax. For example, we don't support |
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110 // union ("x|y"), grouping ("(xy)"), brackets ("[xy]"), and |
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111 // repetition count ("x{5,7}"), among others. |
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112 // |
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113 // Below is the syntax that we do support. We chose it to be a |
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114 // subset of both PCRE and POSIX extended regex, so it's easy to |
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115 // learn wherever you come from. In the following: 'A' denotes a |
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116 // literal character, period (.), or a single \\ escape sequence; |
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117 // 'x' and 'y' denote regular expressions; 'm' and 'n' are for |
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118 // natural numbers. |
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119 // |
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120 // c matches any literal character c |
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121 // \\d matches any decimal digit |
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122 // \\D matches any character that's not a decimal digit |
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123 // \\f matches \f |
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124 // \\n matches \n |
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125 // \\r matches \r |
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126 // \\s matches any ASCII whitespace, including \n |
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127 // \\S matches any character that's not a whitespace |
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128 // \\t matches \t |
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129 // \\v matches \v |
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130 // \\w matches any letter, _, or decimal digit |
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131 // \\W matches any character that \\w doesn't match |
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132 // \\c matches any literal character c, which must be a punctuation |
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133 // . matches any single character except \n |
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134 // A? matches 0 or 1 occurrences of A |
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135 // A* matches 0 or many occurrences of A |
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136 // A+ matches 1 or many occurrences of A |
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137 // ^ matches the beginning of a string (not that of each line) |
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138 // $ matches the end of a string (not that of each line) |
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139 // xy matches x followed by y |
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140 // |
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141 // If you accidentally use PCRE or POSIX extended regex features |
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142 // not implemented by us, you will get a run-time failure. In that |
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143 // case, please try to rewrite your regular expression within the |
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144 // above syntax. |
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145 // |
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146 // This implementation is *not* meant to be as highly tuned or robust |
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147 // as a compiled regex library, but should perform well enough for a |
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148 // death test, which already incurs significant overhead by launching |
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149 // a child process. |
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150 // |
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151 // Known caveats: |
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152 // |
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153 // A "threadsafe" style death test obtains the path to the test |
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154 // program from argv[0] and re-executes it in the sub-process. For |
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155 // simplicity, the current implementation doesn't search the PATH |
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156 // when launching the sub-process. This means that the user must |
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157 // invoke the test program via a path that contains at least one |
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158 // path separator (e.g. path/to/foo_test and |
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159 // /absolute/path/to/bar_test are fine, but foo_test is not). This |
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160 // is rarely a problem as people usually don't put the test binary |
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161 // directory in PATH. |
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162 // |
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163 // TODO(wan@google.com): make thread-safe death tests search the PATH. |
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164 |
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165 // Asserts that a given statement causes the program to exit, with an |
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166 // integer exit status that satisfies predicate, and emitting error output |
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167 // that matches regex. |
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168 # define ASSERT_EXIT(statement, predicate, regex) \ |
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169 GTEST_DEATH_TEST_(statement, predicate, regex, GTEST_FATAL_FAILURE_) |
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170 |
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171 // Like ASSERT_EXIT, but continues on to successive tests in the |
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172 // test case, if any: |
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173 # define EXPECT_EXIT(statement, predicate, regex) \ |
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174 GTEST_DEATH_TEST_(statement, predicate, regex, GTEST_NONFATAL_FAILURE_) |
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175 |
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176 // Asserts that a given statement causes the program to exit, either by |
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177 // explicitly exiting with a nonzero exit code or being killed by a |
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178 // signal, and emitting error output that matches regex. |
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179 # define ASSERT_DEATH(statement, regex) \ |
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180 ASSERT_EXIT(statement, ::testing::internal::ExitedUnsuccessfully, regex) |
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181 |
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182 // Like ASSERT_DEATH, but continues on to successive tests in the |
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183 // test case, if any: |
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184 # define EXPECT_DEATH(statement, regex) \ |
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185 EXPECT_EXIT(statement, ::testing::internal::ExitedUnsuccessfully, regex) |
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186 |
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187 // Two predicate classes that can be used in {ASSERT,EXPECT}_EXIT*: |
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188 |
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189 // Tests that an exit code describes a normal exit with a given exit code. |
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190 class GTEST_API_ ExitedWithCode { |
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191 public: |
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192 explicit ExitedWithCode(int exit_code); |
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193 bool operator()(int exit_status) const; |
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194 private: |
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195 // No implementation - assignment is unsupported. |
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196 void operator=(const ExitedWithCode& other); |
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197 |
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198 const int exit_code_; |
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199 }; |
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200 |
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201 # if !GTEST_OS_WINDOWS |
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202 // Tests that an exit code describes an exit due to termination by a |
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203 // given signal. |
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204 class GTEST_API_ KilledBySignal { |
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205 public: |
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206 explicit KilledBySignal(int signum); |
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207 bool operator()(int exit_status) const; |
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208 private: |
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209 const int signum_; |
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210 }; |
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211 # endif // !GTEST_OS_WINDOWS |
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212 |
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213 // EXPECT_DEBUG_DEATH asserts that the given statements die in debug mode. |
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214 // The death testing framework causes this to have interesting semantics, |
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215 // since the sideeffects of the call are only visible in opt mode, and not |
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216 // in debug mode. |
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217 // |
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218 // In practice, this can be used to test functions that utilize the |
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219 // LOG(DFATAL) macro using the following style: |
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220 // |
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221 // int DieInDebugOr12(int* sideeffect) { |
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222 // if (sideeffect) { |
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223 // *sideeffect = 12; |
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224 // } |
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225 // LOG(DFATAL) << "death"; |
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226 // return 12; |
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227 // } |
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228 // |
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229 // TEST(TestCase, TestDieOr12WorksInDgbAndOpt) { |
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230 // int sideeffect = 0; |
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231 // // Only asserts in dbg. |
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232 // EXPECT_DEBUG_DEATH(DieInDebugOr12(&sideeffect), "death"); |
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233 // |
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234 // #ifdef NDEBUG |
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235 // // opt-mode has sideeffect visible. |
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236 // EXPECT_EQ(12, sideeffect); |
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237 // #else |
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238 // // dbg-mode no visible sideeffect. |
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239 // EXPECT_EQ(0, sideeffect); |
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240 // #endif |
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241 // } |
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242 // |
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243 // This will assert that DieInDebugReturn12InOpt() crashes in debug |
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244 // mode, usually due to a DCHECK or LOG(DFATAL), but returns the |
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245 // appropriate fallback value (12 in this case) in opt mode. If you |
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246 // need to test that a function has appropriate side-effects in opt |
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247 // mode, include assertions against the side-effects. A general |
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248 // pattern for this is: |
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249 // |
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250 // EXPECT_DEBUG_DEATH({ |
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251 // // Side-effects here will have an effect after this statement in |
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252 // // opt mode, but none in debug mode. |
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253 // EXPECT_EQ(12, DieInDebugOr12(&sideeffect)); |
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254 // }, "death"); |
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255 // |
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256 # ifdef NDEBUG |
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257 |
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258 # define EXPECT_DEBUG_DEATH(statement, regex) \ |
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259 GTEST_EXECUTE_STATEMENT_(statement, regex) |
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260 |
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261 # define ASSERT_DEBUG_DEATH(statement, regex) \ |
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262 GTEST_EXECUTE_STATEMENT_(statement, regex) |
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263 |
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264 # else |
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265 |
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266 # define EXPECT_DEBUG_DEATH(statement, regex) \ |
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267 EXPECT_DEATH(statement, regex) |
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268 |
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269 # define ASSERT_DEBUG_DEATH(statement, regex) \ |
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270 ASSERT_DEATH(statement, regex) |
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271 |
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272 # endif // NDEBUG for EXPECT_DEBUG_DEATH |
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273 #endif // GTEST_HAS_DEATH_TEST |
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274 |
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275 // EXPECT_DEATH_IF_SUPPORTED(statement, regex) and |
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276 // ASSERT_DEATH_IF_SUPPORTED(statement, regex) expand to real death tests if |
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277 // death tests are supported; otherwise they just issue a warning. This is |
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278 // useful when you are combining death test assertions with normal test |
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279 // assertions in one test. |
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280 #if GTEST_HAS_DEATH_TEST |
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281 # define EXPECT_DEATH_IF_SUPPORTED(statement, regex) \ |
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282 EXPECT_DEATH(statement, regex) |
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283 # define ASSERT_DEATH_IF_SUPPORTED(statement, regex) \ |
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284 ASSERT_DEATH(statement, regex) |
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285 #else |
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286 # define EXPECT_DEATH_IF_SUPPORTED(statement, regex) \ |
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287 GTEST_UNSUPPORTED_DEATH_TEST_(statement, regex, ) |
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288 # define ASSERT_DEATH_IF_SUPPORTED(statement, regex) \ |
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289 GTEST_UNSUPPORTED_DEATH_TEST_(statement, regex, return) |
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290 #endif |
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291 |
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292 } // namespace testing |
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293 |
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294 #endif // GTEST_INCLUDE_GTEST_GTEST_DEATH_TEST_H_ |