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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_
233