| ASSERT_HRESULT_FAILED(expression); |
EXPECT_HRESULT_FAILED(expression); |
expression is>CComPtr shell; ASSERT_HRESULT_SUCCEEDED(shell.CoCreateInstance(L"Shell.Application")); CComVariant empty; ASSERT_HRESULT_SUCCEEDED(shell->ShellExecute(CComBSTR(url), empty, empty, empty, empty)); Availability: Windows. Type Assertions You>::testing::StaticAssertTypeEq<T1, T2>(); to>template <typename T> class Foo { public: void Bar() { ::testing::StaticAssertTypeEq<int, T>(); } }; the>void Test1() { Foo<bool> foo; } will not generate>void Test2() { Foo<bool> foo; foo.Bar(); } to>Assertion Placement You>Teaching Google Test How to Print Your Values When>#include <iostream> namespace foo { class Bar { ... }; // We want Google Test to be able to print instances of this. // It's important that the << operator is defined in the SAME // namespace that defines Bar. C++'s look-up rules rely on that. ::std::ostream& operator<<(::std::ostream& os, const Bar& bar) { return os << bar.DebugString(); // whatever needed to print bar to os } } // namespace foo Sometimes,>#include <iostream> namespace foo { class Bar { ... }; // It's important that PrintTo() is defined in the SAME // namespace that defines Bar. C++'s look-up rules rely on that. void PrintTo(const Bar& bar, ::std::ostream* os) { *os << bar.DebugString(); // whatever needed to print bar to os } } // namespace foo If>vector<pair<Bar, int> > bar_ints = GetBarIntVector(); EXPECT_TRUE(IsCorrectBarIntVector(bar_ints)) << "bar_ints = " << ::testing::PrintToString(bar_ints); Death Tests In many applications, there are assertions that can cause application failure if a condition is not met. These sanity checks, which ensure that the program is in a known good state, are there to fail at the earliest possible time after some program state is corrupted. If the assertion checks the wrong condition, then the program may proceed in an erroneous state, which could lead to memory corruption, security holes, or worse. Hence it is vitally important to test that such assertion statements work as expected. Since these precondition checks cause the processes to die, we call such tests death tests. More generally, any test that checks that a program terminates (except by throwing an exception) in an expected fashion is also a death test. Note that if a piece of code throws an exception, we don't consider it "death" for the purpose of death tests, as the caller of the code could catch the exception and avoid the crash. If you want to verify exceptions thrown by your code, see Exception Assertions. If you want to test EXPECT_*()/ASSERT_*() failures in your test code, see Catching Failures. How to Write a Death Test Google Test has the following macros to support death tests:
| Fatal assertion |
Nonfatal assertion |
Verifies |
| ASSERT_DEATH(statement, regex`); |
EXPECT_DEATH(statement, regex`); |
statement crashes with the given error |
| ASSERT_DEATH_IF_SUPPORTED(statement, regex`); |
EXPECT_DEATH_IF_SUPPORTED(statement, regex`); |
if death tests are supported, verifies that statement crashes with the given error; otherwise verifies nothing |
| ASSERT_EXIT(statement, predicate, regex`); |
EXPECT_EXIT(statement, predicate, regex`); |
statement exits>::testing::ExitedWithCode(exit_code) This>::testing::KilledBySignal(signal_number) // Not available on Windows. This>TEST(MyDeathTest, Foo) { // This death test uses a compound statement. ASSERT_DEATH({ int n = 5; Foo(&n); }, "Error on line .* of Foo()"); } TEST(MyDeathTest, NormalExit) { EXPECT_EXIT(NormalExit(), ::testing::ExitedWithCode(0), "Success"); } TEST(MyDeathTest, KillMyself) { EXPECT_EXIT(KillMyself(), ::testing::KilledBySignal(SIGKILL), "Sending myself unblockable signal"); } verifies that:
- calling Foo(5) causes the process to die with the given error message,
- calling NormalExit() causes the process to print "Success" to stderr and exit with exit code 0, and
- calling KillMyself() kills the process with signal SIGKILL.
The test function body may contain other assertions and statements as well, if necessary. Important: We strongly recommend you to follow the convention of naming your test case (not test) *DeathTest when it contains a death test, as demonstrated in the above example. The Death Tests And Threads section below explains why. If a test fixture class is shared by normal tests and death tests, you can use typedef to introduce an alias for the fixture class and avoid duplicating its>class FooTest : public ::testing::Test { ... }; typedef FooTest FooDeathTest; TEST_F(FooTest, DoesThis) { // normal test } TEST_F(FooDeathTest, DoesThat) { // death test } Availability: Linux, Windows (requires MSVC 8.0>Regular Expression Syntax On POSIX>POSIX extended regular expression syntax>Wikipedia entry. On Windows, Google Test uses its own simple regular expression implementation. It lacks many features you can find in POSIX extended regular expressions. For example, we don't support union ("x|y"), grouping ("(xy)"), brackets ("[xy]"), and repetition count ("x{5,7}"), among others. Below is what we do support (Letter Adenotes a literal character, period (.), or a single \\ escape sequence; x and y denote regular expressions.):
| c |
matches any literal character c |
| \\d |
matches any decimal digit |
| \\D |
matches any character that's not a decimal digit |
| \\f |
matches \f |
| \\n |
matches \n |
| \\r |
matches \r |
| \\s |
matches any ASCII whitespace, including \n |
| \\S |
matches any character that's not a whitespace |
| \\t |
matches \t |
| \\v |
matches \v |
| \\w |
matches any letter, _, or decimal digit |
| \\W |
matches any character that \\w doesn't match |
| \\c |
matches any literal character c, which must be a punctuation |
| \\. |
matches the . character |
| . |
matches any single character except \n |
| A? |
matches 0 or 1 occurrences of A |
| A* |
matches 0 or many occurrences of A |
| A+ |
matches 1 or many occurrences of A |
| ^ |
matches the beginning of a string (not that of each line) |
| $ |
matches the end of a string (not that of each line) |
| xy |
matches x followed> when it uses POSIX extended regular expressions, orGTEST_USES_SIMPLE_RE=1 when>How It Works Under>Death Tests And Threads The>Death Test Styles The "threadsafe">::testing::FLAGS_gtest_death_test_style = "threadsafe"; You>TEST(MyDeathTest, TestOne) { ::testing::FLAGS_gtest_death_test_style = "threadsafe"; // This test is run in the "threadsafe" style: ASSERT_DEATH(ThisShouldDie(), ""); } TEST(MyDeathTest, TestTwo) { // This test is run in the "fast" style: ASSERT_DEATH(ThisShouldDie(), ""); } int main(int argc, char** argv) { ::testing::InitGoogleTest(&argc, argv); ::testing::FLAGS_gtest_death_test_style = "fast"; return RUN_ALL_TESTS(); } Caveats The statement argument>Using Assertions in Sub-routines Adding Traces to Assertions If a test sub-routine is called from several places, when an assertion inside it fails, it can be hard to tell which invocation of the sub-routine the failure is from. You can alleviate this problem using extra logging or custom failure messages, but that usually clutters up your tests. A better solution is to use theSCOPED_TRACE macro:
where message can>10: void Sub1(int n) { 11: EXPECT_EQ(1, Bar(n)); 12: EXPECT_EQ(2, Bar(n + 1)); 13: } 14: 15: TEST(FooTest, Bar) { 16: { 17: SCOPED_TRACE("A"); // This trace point will be included in 18: // every failure in this scope. 19: Sub1(1); 20: } 21: // Now it won't. 22: Sub1(9); 23: } could>path/to/foo_test.cc:11: Failure Value of: Bar(n) Expected: 1 Actual: 2 Trace: path/to/foo_test.cc:17: A path/to/foo_test.cc:12: Failure Value of: Bar(n + 1) Expected: 2 Actual: 3 Without>Propagating Fatal Failures A>void Subroutine() { // Generates a fatal failure and aborts the current function. ASSERT_EQ(1, 2); // The following won't be executed. ... } TEST(FooTest, Bar) { Subroutine(); // The intended behavior is for the fatal failure // in Subroutine() to abort the entire test. // The actual behavior: the function goes on after Subroutine() returns. int* p = NULL; *p = 3; // Segfault! } Since>Asserting on Subroutines As shown above, if your test calls a subroutine that has an ASSERT_* failure in it, the test will continue after the subroutine returns. This may not be what you want. Often people want fatal failures to propagate like exceptions. For that Google Test offers the following macros:
| Fatal assertion |
Nonfatal assertion |
Verifies |
| ASSERT_NO_FATAL_FAILURE(statement); |
EXPECT_NO_FATAL_FAILURE(statement); |
statement doesn't>ASSERT_NO_FATAL_FAILURE(Foo()); int i; EXPECT_NO_FATAL_FAILURE({ i = Bar(); }); Availability: Linux, Windows, Mac. Assertions>Checking for Failures in the Current Test HasFatalFailure() in>class Test { public: ... static bool HasFatalFailure(); }; The>TEST(FooTest, Bar) { Subroutine(); // Aborts if Subroutine() had a fatal failure. if (HasFatalFailure()) return; // The following won't be executed. ... } If HasFatalFailure() is>if (::testing::Test::HasFatalFailure()) return; Similarly, HasNonfatalFailure() returns true if>Logging Additional Information In>TEST_F(WidgetUsageTest, MinAndMaxWidgets) { RecordProperty("MaximumWidgets", ComputeMaxUsage()); RecordProperty("MinimumWidgets", ComputeMinUsage()); } will>... <testcase name="MinAndMaxWidgets" status="run" time="6" classname="WidgetUsageTest" MaximumWidgets="12" MinimumWidgets="9" /> ... Note:
- RecordProperty() is>Sharing Resources Between Tests in the Same Test Case
Google Test>class FooTest : public ::testing::Test { protected: // Per-test-case set-up. // Called before the first test in this test case. // Can be omitted if not needed. static void SetUpTestCase() { shared_resource_ = new ...; } // Per-test-case tear-down. // Called after the last test in this test case. // Can be omitted if not needed. static void TearDownTestCase() { delete shared_resource_; shared_resource_ = NULL; } // You can define per-test set-up and tear-down logic as usual. virtual void SetUp() { ... } virtual void TearDown() { ... } // Some expensive resource shared by all tests. static T* shared_resource_; }; T* FooTest::shared_resource_ = NULL; TEST_F(FooTest, Test1) { ... you can refer to shared_resource here ... } TEST_F(FooTest, Test2) { ... you can refer to shared_resource here ... } Availability: Linux, Windows, Mac. Global Set-Up and Tear-Down Just>class Environment { public: virtual ~Environment() {} // Override this to define how to set up the environment. virtual void SetUp() {} // Override this to define how to tear down the environment. virtual void TearDown() {} }; Then,>Environment* AddGlobalTestEnvironment(Environment* env); Now,>::testing::Environment* const foo_env = ::testing::AddGlobalTestEnvironment(new FooEnvironment); However,>Value Parameterized Tests Value-parameterized>TEST(MyCodeTest, TestFoo) { // A code to test foo(). } Usually>void TestFooHelper(bool flag_value) { flag = flag_value; // A code to test foo(). } TEST(MyCodeTest, TestFoo) { TestFooHelper(false); TestFooHelper(true); } But>How to Write Value-Parameterized Tests To>class FooTest : public ::testing::TestWithParam<const char*> { // You can implement all the usual fixture class members here. // To access the test parameter, call GetParam() from class // TestWithParam<T>. }; // Or, when you want to add parameters to a pre-existing fixture class: class BaseTest : public ::testing::Test { ... }; class BarTest : public BaseTest, public ::testing::WithParamInterface<const char*> { ... }; Then,>TEST_P(FooTest, DoesBlah) { // Inside a test, access the test parameter with the GetParam() method // of the TestWithParam<T> class: EXPECT_TRUE(foo.Blah(GetParam())); ... } TEST_P(FooTest, HasBlahBlah) { ... } Finally, you can use INSTANTIATE_TEST_CASE_P to instantiate the test case with any set of parameters you want. Google Test defines a number of functions for generating test parameters. They return what we call (surprise!) parameter generators. Here is a summary of them, which are all in the testing namespace:
| Range(begin, end[, step]) |
Yields values {begin, begin+step, begin+step+step, ...}. The values do not include end. step defaults to 1. |
| Values(v1, v2, ..., vN) |
Yields values {v1, v2, ..., vN}. |
| ValuesIn(container)andValuesIn(begin, end) |
Yields values from a C-style array, an STL-style container, or an iterator range [begin, end). container, begin, and end can be expressions whose values are determined at run time. |
| Bool() |
Yields sequence {false, true}. |
| Combine(g1, g2, ..., gN) |
Yields all combinations (the Cartesian product for the math savvy) of the values generated by the N generators. This>. See comments in include/gtest/internal/gtest-port.h for >source code. The>INSTANTIATE_TEST_CASE_P(InstantiationName, FooTest, ::testing::Values("meeny", "miny", "moe")); To distinguish different instances of the pattern (yes, you can instantiate it more than once), the first argument to INSTANTIATE_TEST_CASE_P is a prefix that will be added to the actual test case name. Remember to pick unique prefixes for different instantiations. The tests from the instantiation above will have these names:
- InstantiationName/FooTest.DoesBlah/0 for "meeny"
- InstantiationName/FooTest.DoesBlah/1 for "miny"
- InstantiationName/FooTest.DoesBlah/2 for "moe"
- InstantiationName/FooTest.HasBlahBlah/0 for "meeny"
- InstantiationName/FooTest.HasBlahBlah/1 for "miny"
- InstantiationName/FooTest.HasBlahBlah/2 for "moe"
You can use these names in --gtest_filter. This>const char* pets[] = {"cat", "dog"}; INSTANTIATE_TEST_CASE_P(AnotherInstantiationName, FooTest, ::testing::ValuesIn(pets)); The>these files for >Creating Value-Parameterized Abstract Tests In>Typed Tests Suppose>template <typename T> class FooTest : public ::testing::Test { public: ... typedef std::list<T> List; static T shared_; T value_; }; Next,>typedef ::testing::Types<char, int, unsigned int> MyTypes; TYPED_TEST_CASE(FooTest, MyTypes); The typedef is>TYPED_TEST(FooTest, DoesBlah) { // Inside a test, refer to the special name TypeParam to get the type // parameter. Since we are inside a derived class template, C++ requires // us to visit the members of FooTest via 'this'. TypeParam n = this->value_; // To visit static members of the fixture, add the 'TestFixture::' // prefix. n += TestFixture::shared_; // To refer to typedefs in the fixture, add the 'typename TestFixture::' // prefix. The 'typename' is required to satisfy the compiler. typename TestFixture::List values; values.push_back(n); ... } TYPED_TEST(FooTest, HasPropertyA) { ... } You>Type-Parameterized Tests Type-parameterized>template <typename T> class FooTest : public ::testing::Test { ... }; Next,>TYPED_TEST_CASE_P(FooTest); The _P suffix>TYPED_TEST_P(FooTest, DoesBlah) { // Inside a test, refer to TypeParam to get the type parameter. TypeParam n = 0; ... } TYPED_TEST_P(FooTest, HasPropertyA) { ... } Now>REGISTER_TYPED_TEST_CASE_P(FooTest, DoesBlah, HasPropertyA); Finally,>typedef ::testing::Types<char, int, unsigned int> MyTypes; INSTANTIATE_TYPED_TEST_CASE_P(My, FooTest, MyTypes); To>INSTANTIATE_TYPED_TEST_CASE_P(My, FooTest, int); You>Testing Private Code If>Static Functions Both>Private Class Members Private>FRIEND_TEST(TestCaseName, TestName); For>// foo.h #include "gtest/gtest_prod.h" // Defines FRIEND_TEST. class Foo { ... private: FRIEND_TEST(FooTest, BarReturnsZeroOnNull); int Bar(void* x); }; // foo_test.cc ... TEST(FooTest, BarReturnsZeroOnNull) { Foo foo; EXPECT_EQ(0, foo.Bar(NULL)); // Uses Foo's private member Bar(). } Pay>namespace my_namespace { class Foo { friend class FooTest; FRIEND_TEST(FooTest, Bar); FRIEND_TEST(FooTest, Baz); ... definition of the class Foo ... }; } // namespace my_namespace Your>namespace my_namespace { class FooTest : public ::testing::Test { protected: ... }; TEST_F(FooTest, Bar) { ... } TEST_F(FooTest, Baz) { ... } } // namespace my_namespace Catching Failures If you are building a testing utility on top of Google Test, you'll want to test your utility. What framework would you use to test it? Google Test, of course. The challenge is to verify that your testing utility reports failures correctly. In frameworks that report a failure by throwing an exception, you could catch the exception and assert on it. But Google Test doesn't use exceptions, so how do we test that a piece of code generates an expected failure? "gtest/gtest-spi.h" contains some constructs to do this. After #including this header, you can use
| EXPECT_FATAL_FAILURE(statement, substring); |
to assert that statement generates a fatal (e.g. ASSERT_*) failure whose message contains the given substring, or use
| EXPECT_NONFATAL_FAILURE(statement, substring); |
if you are expecting a non-fatal (e.g. EXPECT_*) failure. For technical reasons, there are some caveats:
- You cannot stream a failure message to either macro.
- statement in EXPECT_FATAL_FAILURE() cannot reference local non-static variables or non-static members of this object.
- statement in EXPECT_FATAL_FAILURE() cannot return a value.
Note: Google Test is designed with threads in mind. Once the synchronization primitives in "gtest/internal/gtest-port.h" have been implemented, Google Test will become thread-safe, meaning that you can then use assertions in multiple threads concurrently. Before that, however, Google Test only supports single-threaded usage. Once thread-safe, EXPECT_FATAL_FAILURE() and EXPECT_NONFATAL_FAILURE() will capture failures in the current thread only. If statement creates new threads, failures in these threads will be ignored. If you want to capture failures from all threads instead, you should use the following macros:
| EXPECT_FATAL_FAILURE_ON_ALL_THREADS(statement, substring); |
| EXPECT_NONFATAL_FAILURE_ON_ALL_THREADS(statement,>Getting the Current Test's Name Sometimes>namespace testing { class TestInfo { public: // Returns the test case name and the test name, respectively. // // Do NOT delete or free the return value - it's managed by the // TestInfo class. const char* test_case_name() const; const char* name() const; }; } // namespace testing
To>// Gets information about the currently running test. // Do NOT delete the returned object - it's managed by the UnitTest class. const ::testing::TestInfo* const test_info = ::testing::UnitTest::GetInstance()->current_test_info(); printf("We are in test %s of test case %s.\n", test_info->name(), test_info->test_case_name());
current_test_info() returns>Extending Google Test by Handling Test Events
Google Test>Defining Event Listeners
To>testing::TestEventListener or testing::EmptyTestEventListener. The>UnitTest reflects>TestCase has>TestInfo contains>TestPartResult represents> class MinimalistPrinter : public ::testing::EmptyTestEventListener { // Called before a test starts. virtual void OnTestStart(const ::testing::TestInfo& test_info) { printf("*** Test %s.%s starting.\n", test_info.test_case_name(), test_info.name()); } // Called after a failed assertion or a SUCCEED() invocation. virtual void OnTestPartResult( const ::testing::TestPartResult& test_part_result) { printf("%s in %s:%d\n%s\n", test_part_result.failed() ? "*** Failure" : "Success", test_part_result.file_name(), test_part_result.line_number(), test_part_result.summary()); } // Called after a test ends. virtual void OnTestEnd(const ::testing::TestInfo& test_info) { printf("*** Test %s.%s ending.\n", test_info.test_case_name(), test_info.name()); } };
Using Event Listeners
To>TestEventListeners - >int main(int argc, char** argv) { ::testing::InitGoogleTest(&argc, argv); // Gets hold of the event listener list. ::testing::TestEventListeners& listeners = ::testing::UnitTest::GetInstance()->listeners(); // Adds a listener to the end. Google Test takes the ownership. listeners.Append(new MinimalistPrinter); return RUN_ALL_TESTS(); }
There's> ... delete listeners.Release(listeners.default_result_printer()); listeners.Append(new MinimalistPrinter); return RUN_ALL_TESTS();
Now,>sample.
You>Generating Failures in Listeners
You>here.
Running Test Programs: Advanced Options
Google Test>int main(int argc, char** argv) { // Disables elapsed time by default. ::testing::GTEST_FLAG(print_time) = false; // This allows the user to override the flag on the command line. ::testing::InitGoogleTest(&argc, argv); return RUN_ALL_TESTS(); }
Selecting Tests
This>Listing Test Names
Sometimes>TestCase1. TestName1 TestName2 TestCase2. TestName
None>Running a Subset of the Tests
By> Also runs everything, due to the single match-everything * value.
- ./foo_test --gtest_filter=FooTest.* Runs> Runs any test whose full name contains either "Null" or "Constructor".
- ./foo_test --gtest_filter=-*DeathTest.* Runs> Runs everything in test case FooTest except FooTest.Bar.
Availability: Linux, Windows, Mac.
Temporarily Disabling Tests
If>// Tests that Foo does Abc. TEST(FooTest, DISABLED_DoesAbc) { ... } class DISABLED_BarTest : public ::testing::Test { ... }; // Tests that Bar does Xyz. TEST_F(DISABLED_BarTest, DoesXyz) { ... }
Note: This>Temporarily Enabling Disabled Tests
To include disabled tests in test execution, just invoke the test program with the --gtest_also_run_disabled_tests flag or set the GTEST_ALSO_RUN_DISABLED_TESTS environment variable to a value other than 0. You can combine this with the --gtest_filter flag>Repeating the Tests
Once in a while you'll run into a test whose result is hit-or-miss. Perhaps it will fail only 1% of the time, making it rather hard to reproduce the bug under a debugger. This can be a major source of frustration.
The --gtest_repeat flag allows you to repeat all (or selected) test methods in a program many times. Hopefully, a flaky test will eventually fail and give you a chance to debug. Here's how to use it:
| $> |
Repeat foo_test 1000 times and don't stop at failures. |
| $> |
A negative count means repeating forever. |
| $> |
Repeat foo_test 1000 times, stopping at the first failure. This is especially useful when running under a debugger: when the testfails, it will drop into the debugger and you can then inspect variables and stacks. |
| $> |
Repeat the tests whose name matches the filter 1000 times. |
If>Shuffling the Tests
You> flag (or set the GTEST_RANDOM_SEED environment>, Google Test will pick a different random seed and re-shuffle the tests in each iteration.
Availability: Linux, Windows, Mac;>Controlling Test Output
This>Colored Terminal Output
Google Test>Suppressing the Elapsed Time
By> command line flag. Setting theGTEST_PRINT_TIME environment>Generating an XML Report
Google Test>Hudson. Since><testsuites name="AllTests" ...> <testsuite name="test_case_name" ...> <testcase name="test_name" ...> <failure message="..."/> <failure message="..."/> <failure message="..."/> </testcase> </testsuite> </testsuites>
- The>TEST(MathTest, Addition) { ... } TEST(MathTest, Subtraction) { ... } TEST(LogicTest, NonContradiction) { ... }
could><?xml version="1.0" encoding="UTF-8"?> <testsuites tests="3" failures="1" errors="0" time="35" name="AllTests"> <testsuite name="MathTest" tests="2" failures="1" errors="0" time="15"> <testcase name="Addition" status="run" time="7" classname=""> <failure message="Value of: add(1, 1)
 Actual: 3
Expected: 2" type=""/> <failure message="Value of: add(1, -1)
 Actual: 1
Expected: 0" type=""/> </testcase> <testcase name="Subtraction" status="run" time="5" classname=""> </testcase> </testsuite> <testsuite name="LogicTest" tests="1" failures="0" errors="0" time="5"> <testcase name="NonContradiction" status="run" time="5" classname=""> </testcase> </testsuite> </testsuites> Things>Controlling How Failures Are Reported Turning Assertion Failures into Break-Points When>Disabling Catching Test-Thrown Exceptions Google Test> flag when running the tests. Availability: Linux, Windows, Mac. Letting Another Testing Framework Drive If>#include "gtest/gtest.h" int main(int argc, char** argv) { ::testing::GTEST_FLAG(throw_on_failure) = true; // Important: Google Test must be initialized. ::testing::InitGoogleTest(&argc, argv); ... whatever your existing testing framework requires ... } With>void TestFooDoesBar() { Foo foo; EXPECT_LE(foo.Bar(1), 100); // A Google Test assertion. CPPUNIT_ASSERT(foo.IsEmpty()); // A native assertion. } If> in your main(),>Distributing Test Functions to Multiple Machines If>TEST(A, V) TEST(A, W) TEST(B, X) TEST(B, Y) TEST(B, Z) and>Fusing Google Test Source Files Google Test's>python fuse_gtest_files.py OUTPUT_DIR and>scripts/test/Makefile file>Where to Go from Here Congratulations! You've>Frequently-Asked Questions.
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