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gtest-spi.h
1 // Copyright 2007, Google Inc.
2 // All rights reserved.
3 //
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are
6 // met:
7 //
8 // * Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 // * Redistributions in binary form must reproduce the above
11 // copyright notice, this list of conditions and the following disclaimer
12 // in the documentation and/or other materials provided with the
13 // distribution.
14 // * Neither the name of Google Inc. nor the names of its
15 // contributors may be used to endorse or promote products derived from
16 // this software without specific prior written permission.
17 //
18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 //
30 // Author: wan@google.com (Zhanyong Wan)
31 //
32 // Utilities for testing Google Test itself and code that uses Google Test
33 // (e.g. frameworks built on top of Google Test).
34
35 #ifndef GTEST_INCLUDE_GTEST_GTEST_SPI_H_
36 #define GTEST_INCLUDE_GTEST_GTEST_SPI_H_
37
38 #include "gtest/gtest.h"
39
40 namespace testing {
41
42 // This helper class can be used to mock out Google Test failure reporting
43 // so that we can test Google Test or code that builds on Google Test.
44 //
45 // An object of this class appends a TestPartResult object to the
46 // TestPartResultArray object given in the constructor whenever a Google Test
47 // failure is reported. It can either intercept only failures that are
48 // generated in the same thread that created this object or it can intercept
49 // all generated failures. The scope of this mock object can be controlled with
50 // the second argument to the two arguments constructor.
51 class GTEST_API_ ScopedFakeTestPartResultReporter
52 : public TestPartResultReporterInterface {
53 public:
54 // The two possible mocking modes of this object.
55 enum InterceptMode {
56 INTERCEPT_ONLY_CURRENT_THREAD, // Intercepts only thread local failures.
57 INTERCEPT_ALL_THREADS // Intercepts all failures.
58 };
59
60 // The c'tor sets this object as the test part result reporter used
61 // by Google Test. The 'result' parameter specifies where to report the
62 // results. This reporter will only catch failures generated in the current
63 // thread. DEPRECATED
64 explicit ScopedFakeTestPartResultReporter(TestPartResultArray* result);
65
66 // Same as above, but you can choose the interception scope of this object.
67 ScopedFakeTestPartResultReporter(InterceptMode intercept_mode,
68 TestPartResultArray* result);
69
70 // The d'tor restores the previous test part result reporter.
71 virtual ~ScopedFakeTestPartResultReporter();
72
73 // Appends the TestPartResult object to the TestPartResultArray
74 // received in the constructor.
75 //
76 // This method is from the TestPartResultReporterInterface
77 // interface.
78 virtual void ReportTestPartResult(const TestPartResult& result);
79 private:
80 void Init();
81
82 const InterceptMode intercept_mode_;
83 TestPartResultReporterInterface* old_reporter_;
84 TestPartResultArray* const result_;
85
86 GTEST_DISALLOW_COPY_AND_ASSIGN_(ScopedFakeTestPartResultReporter);
87 };
88
89 namespace internal {
90
91 // A helper class for implementing EXPECT_FATAL_FAILURE() and
92 // EXPECT_NONFATAL_FAILURE(). Its destructor verifies that the given
93 // TestPartResultArray contains exactly one failure that has the given
94 // type and contains the given substring. If that's not the case, a
95 // non-fatal failure will be generated.
96 class GTEST_API_ SingleFailureChecker {
97 public:
98 // The constructor remembers the arguments.
99 SingleFailureChecker(const TestPartResultArray* results,
100 TestPartResult::Type type,
101 const string& substr);
102 ~SingleFailureChecker();
103 private:
104 const TestPartResultArray* const results_;
105 const TestPartResult::Type type_;
106 const string substr_;
107
108 GTEST_DISALLOW_COPY_AND_ASSIGN_(SingleFailureChecker);
109 };
110
111 } // namespace internal
112
113 } // namespace testing
114
115 // A set of macros for testing Google Test assertions or code that's expected
116 // to generate Google Test fatal failures. It verifies that the given
117 // statement will cause exactly one fatal Google Test failure with 'substr'
118 // being part of the failure message.
119 //
120 // There are two different versions of this macro. EXPECT_FATAL_FAILURE only
121 // affects and considers failures generated in the current thread and
122 // EXPECT_FATAL_FAILURE_ON_ALL_THREADS does the same but for all threads.
123 //
124 // The verification of the assertion is done correctly even when the statement
125 // throws an exception or aborts the current function.
126 //
127 // Known restrictions:
128 // - 'statement' cannot reference local non-static variables or
129 // non-static members of the current object.
130 // - 'statement' cannot return a value.
131 // - You cannot stream a failure message to this macro.
132 //
133 // Note that even though the implementations of the following two
134 // macros are much alike, we cannot refactor them to use a common
135 // helper macro, due to some peculiarity in how the preprocessor
136 // works. The AcceptsMacroThatExpandsToUnprotectedComma test in
137 // gtest_unittest.cc will fail to compile if we do that.
138 #define EXPECT_FATAL_FAILURE(statement, substr) \
139 do { \
140 class GTestExpectFatalFailureHelper {\
141 public:\
142 static void Execute() { statement; }\
143 };\
144 ::testing::TestPartResultArray gtest_failures;\
145 ::testing::internal::SingleFailureChecker gtest_checker(\
146 &gtest_failures, ::testing::TestPartResult::kFatalFailure, (substr));\
147 {\
148 ::testing::ScopedFakeTestPartResultReporter gtest_reporter(\
149 ::testing::ScopedFakeTestPartResultReporter:: \
150 INTERCEPT_ONLY_CURRENT_THREAD, &gtest_failures);\
151 GTestExpectFatalFailureHelper::Execute();\
152 }\
153 } while (::testing::internal::AlwaysFalse())
154
155 #define EXPECT_FATAL_FAILURE_ON_ALL_THREADS(statement, substr) \
156 do { \
157 class GTestExpectFatalFailureHelper {\
158 public:\
159 static void Execute() { statement; }\
160 };\
161 ::testing::TestPartResultArray gtest_failures;\
162 ::testing::internal::SingleFailureChecker gtest_checker(\
163 &gtest_failures, ::testing::TestPartResult::kFatalFailure, (substr));\
164 {\
165 ::testing::ScopedFakeTestPartResultReporter gtest_reporter(\
166 ::testing::ScopedFakeTestPartResultReporter:: \
167 INTERCEPT_ALL_THREADS, &gtest_failures);\
168 GTestExpectFatalFailureHelper::Execute();\
169 }\
170 } while (::testing::internal::AlwaysFalse())
171
172 // A macro for testing Google Test assertions or code that's expected to
173 // generate Google Test non-fatal failures. It asserts that the given
174 // statement will cause exactly one non-fatal Google Test failure with 'substr'
175 // being part of the failure message.
176 //
177 // There are two different versions of this macro. EXPECT_NONFATAL_FAILURE only
178 // affects and considers failures generated in the current thread and
179 // EXPECT_NONFATAL_FAILURE_ON_ALL_THREADS does the same but for all threads.
180 //
181 // 'statement' is allowed to reference local variables and members of
182 // the current object.
183 //
184 // The verification of the assertion is done correctly even when the statement
185 // throws an exception or aborts the current function.
186 //
187 // Known restrictions:
188 // - You cannot stream a failure message to this macro.
189 //
190 // Note that even though the implementations of the following two
191 // macros are much alike, we cannot refactor them to use a common
192 // helper macro, due to some peculiarity in how the preprocessor
193 // works. If we do that, the code won't compile when the user gives
194 // EXPECT_NONFATAL_FAILURE() a statement that contains a macro that
195 // expands to code containing an unprotected comma. The
196 // AcceptsMacroThatExpandsToUnprotectedComma test in gtest_unittest.cc
197 // catches that.
198 //
199 // For the same reason, we have to write
200 // if (::testing::internal::AlwaysTrue()) { statement; }
201 // instead of
202 // GTEST_SUPPRESS_UNREACHABLE_CODE_WARNING_BELOW_(statement)
203 // to avoid an MSVC warning on unreachable code.
204 #define EXPECT_NONFATAL_FAILURE(statement, substr) \
205 do {\
206 ::testing::TestPartResultArray gtest_failures;\
207 ::testing::internal::SingleFailureChecker gtest_checker(\
208 &gtest_failures, ::testing::TestPartResult::kNonFatalFailure, \
209 (substr));\
210 {\
211 ::testing::ScopedFakeTestPartResultReporter gtest_reporter(\
212 ::testing::ScopedFakeTestPartResultReporter:: \
213 INTERCEPT_ONLY_CURRENT_THREAD, &gtest_failures);\
214 if (::testing::internal::AlwaysTrue()) { statement; }\
215 }\
216 } while (::testing::internal::AlwaysFalse())
217
218 #define EXPECT_NONFATAL_FAILURE_ON_ALL_THREADS(statement, substr) \
219 do {\
220 ::testing::TestPartResultArray gtest_failures;\
221 ::testing::internal::SingleFailureChecker gtest_checker(\
222 &gtest_failures, ::testing::TestPartResult::kNonFatalFailure, \
223 (substr));\
224 {\
225 ::testing::ScopedFakeTestPartResultReporter gtest_reporter(\
226 ::testing::ScopedFakeTestPartResultReporter::INTERCEPT_ALL_THREADS, \
227 &gtest_failures);\
228 if (::testing::internal::AlwaysTrue()) { statement; }\
229 }\
230 } while (::testing::internal::AlwaysFalse())
231
232 #endif // GTEST_INCLUDE_GTEST_GTEST_SPI_H_
testing::ScopedFakeTestPartResultReporter
Definition: gtest-spi.h:51
testing::TestPartResult
Definition: gtest-test-part.h:47
testing::internal::SingleFailureChecker
Definition: gtest-spi.h:96
testing::TestPartResultReporterInterface
Definition: gtest-test-part.h:146
testing::TestPartResultArray
Definition: gtest-test-part.h:126