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sample9_unittest.cc
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29 // Author: vladl@google.com (Vlad Losev)
30 
31 // This sample shows how to use Google Test listener API to implement
32 // an alternative console output and how to use the UnitTest reflection API
33 // to enumerate test cases and tests and to inspect their results.
34 
35 #include <stdio.h>
36 
37 #include "gtest/gtest.h"
38 
39 using ::testing::EmptyTestEventListener;
41 using ::testing::Test;
43 using ::testing::TestEventListeners;
44 using ::testing::TestInfo;
45 using ::testing::TestPartResult;
46 using ::testing::UnitTest;
47 
48 namespace {
49 
50 // Provides alternative output mode which produces minimal amount of
51 // information about tests.
52 class TersePrinter : public EmptyTestEventListener {
53  private:
54  // Called before any test activity starts.
55  virtual void OnTestProgramStart(const UnitTest& /* unit_test */) {}
56 
57  // Called after all test activities have ended.
58  virtual void OnTestProgramEnd(const UnitTest& unit_test) {
59  fprintf(stdout, "TEST %s\n", unit_test.Passed() ? "PASSED" : "FAILED");
60  fflush(stdout);
61  }
62 
63  // Called before a test starts.
64  virtual void OnTestStart(const TestInfo& test_info) {
66  "*** Test %s.%s starting.\n",
67  test_info.test_case_name(),
68  test_info.name());
69  fflush(stdout);
70  }
71 
72  // Called after a failed assertion or a SUCCEED() invocation.
73  virtual void OnTestPartResult(const TestPartResult& test_part_result) {
75  "%s in %s:%d\n%s\n",
76  test_part_result.failed() ? "*** Failure" : "Success",
77  test_part_result.file_name(),
78  test_part_result.line_number(),
79  test_part_result.summary());
80  fflush(stdout);
81  }
82 
83  // Called after a test ends.
84  virtual void OnTestEnd(const TestInfo& test_info) {
86  "*** Test %s.%s ending.\n",
87  test_info.test_case_name(),
88  test_info.name());
89  fflush(stdout);
90  }
91 }; // class TersePrinter
92 
93 TEST(CustomOutputTest, PrintsMessage) {
94  printf("Printing something from the test body...\n");
95 }
96 
97 TEST(CustomOutputTest, Succeeds) {
98  SUCCEED() << "SUCCEED() has been invoked from here";
99 }
100 
101 TEST(CustomOutputTest, Fails) {
102  EXPECT_EQ(1, 2)
103  << "This test fails in order to demonstrate alternative failure messages";
104 }
105 
106 } // namespace
107 
108 int main(int argc, char **argv) {
109  InitGoogleTest(&argc, argv);
110 
111  bool terse_output = false;
112  if (argc > 1 && strcmp(argv[1], "--terse_output") == 0 )
113  terse_output = true;
114  else
115  printf("%s\n", "Run this program with --terse_output to change the way "
116  "it prints its output.");
117 
118  UnitTest& unit_test = *UnitTest::GetInstance();
119 
120  // If we are given the --terse_output command line flag, suppresses the
121  // standard output and attaches own result printer.
122  if (terse_output) {
123  TestEventListeners& listeners = unit_test.listeners();
124 
125  // Removes the default console output listener from the list so it will
126  // not receive events from Google Test and won't print any output. Since
127  // this operation transfers ownership of the listener to the caller we
128  // have to delete it as well.
129  delete listeners.Release(listeners.default_result_printer());
130 
131  // Adds the custom output listener to the list. It will now receive
132  // events from Google Test and print the alternative output. We don't
133  // have to worry about deleting it since Google Test assumes ownership
134  // over it after adding it to the list.
135  listeners.Append(new TersePrinter);
136  }
137  int ret_val = RUN_ALL_TESTS();
138 
139  // This is an example of using the UnitTest reflection API to inspect test
140  // results. Here we discount failures from the tests we expected to fail.
141  int unexpectedly_failed_tests = 0;
142  for (int i = 0; i < unit_test.total_test_case_count(); ++i) {
143  const TestCase& test_case = *unit_test.GetTestCase(i);
144  for (int j = 0; j < test_case.total_test_count(); ++j) {
145  const TestInfo& test_info = *test_case.GetTestInfo(j);
146  // Counts failed tests that were not meant to fail (those without
147  // 'Fails' in the name).
148  if (test_info.result()->Failed() &&
149  strcmp(test_info.name(), "Fails") != 0) {
150  unexpectedly_failed_tests++;
151  }
152  }
153  }
154 
155  // Test that were meant to fail should not affect the test program outcome.
156  if (unexpectedly_failed_tests == 0)
157  ret_val = 0;
158 
159  return ret_val;
160 }