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Allows a value-parameterized test fixture to derive from Test and WithParamInterface<T> separately; contributed by Matt Austern.

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This commit is contained in:
zhanyong.wan
2010-12-06 22:18:59 +00:00
parent b5eb6ed9e2
commit 915129ee6f
4 changed files with 127 additions and 18 deletions
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40
include/gtest/gtest-param-test.h
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@@ -1,4 +1,6 @@
// This file was GENERATED by a script. DO NOT EDIT BY HAND!!!
// This file was GENERATED by command:
// pump.py gtest-param-test.h.pump
// DO NOT EDIT BY HAND!!!
// Copyright 2008, Google Inc.
// All rights reserved.
@@ -48,10 +50,12 @@
#if 0
// To write value-parameterized tests, first you should define a fixture
// class. It must be derived from testing::TestWithParam<T>, where T is
// the type of your parameter values. TestWithParam<T> is itself derived
// from testing::Test. T can be any copyable type. If it's a raw pointer,
// you are responsible for managing the lifespan of the pointed values.
// class. It is usually derived from testing::TestWithParam<T> (see below for
// another inheritance scheme that's sometimes useful in more complicated
// class hierarchies), where the type of your parameter values.
// TestWithParam<T> is itself derived from testing::Test. T can be any
// copyable type. If it's a raw pointer, you are responsible for managing the
// lifespan of the pointed values.
class FooTest : public ::testing::TestWithParam<const char*> {
// You can implement all the usual class fixture members here.
@@ -146,6 +150,32 @@ INSTANTIATE_TEST_CASE_P(AnotherInstantiationName, FooTest, ValuesIn(pets));
// In the future, we plan to publish the API for defining new parameter
// generators. But for now this interface remains part of the internal
// implementation and is subject to change.
//
//
// A parameterized test fixture must be derived from testing::Test and from
// testing::WithParamInterface<T>, where T is the type of the parameter
// values. Inheriting from TestWithParam<T> satisfies that requirement because
// TestWithParam<T> inherits from both Test and WithParamInterface. In more
// complicated hierarchies, however, it is occasionally useful to inherit
// separately from Test and WithParamInterface. For example:
class BaseTest : public ::testing::Test {
// You can inherit all the usual members for a non-parameterized test
// fixture here.
};
class DerivedTest : public BaseTest, public ::testing::WithParamInterface<int> {
// The usual test fixture members go here too.
};
TEST_F(BaseTest, HasFoo) {
// This is an ordinary non-parameterized test.
}
TEST_P(DerivedTest, DoesBlah) {
// GetParam works just the same here as if you inherit from TestWithParam.
EXPECT_TRUE(foo.Blah(GetParam()));
}
#endif // 0

45
include/gtest/gtest-param-test.h.pump
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@@ -49,10 +49,12 @@ $var maxtuple = 10 $$ Maximum number of Combine arguments we want to support.
#if 0
// To write value-parameterized tests, first you should define a fixture
// class. It must be derived from testing::TestWithParam<T>, where T is
// the type of your parameter values. TestWithParam<T> is itself derived
// from testing::Test. T can be any copyable type. If it's a raw pointer,
// you are responsible for managing the lifespan of the pointed values.
// class. It is usually derived from testing::TestWithParam<T> (see below for
// another inheritance scheme that's sometimes useful in more complicated
// class hierarchies), where the type of your parameter values.
// TestWithParam<T> is itself derived from testing::Test. T can be any
// copyable type. If it's a raw pointer, you are responsible for managing the
// lifespan of the pointed values.
class FooTest : public ::testing::TestWithParam<const char*> {
// You can implement all the usual class fixture members here.
@@ -134,9 +136,12 @@ INSTANTIATE_TEST_CASE_P(AnotherInstantiationName, FooTest, ValuesIn(pets));
// in the given test case, whether their definitions come before or
// AFTER the INSTANTIATE_TEST_CASE_P statement.
//
// Please also note that generator expressions are evaluated in
// RUN_ALL_TESTS(), after main() has started. This allows evaluation of
// parameter list based on command line parameters.
// Please also note that generator expressions (including parameters to the
// generators) are evaluated in InitGoogleTest(), after main() has started.
// This allows the user on one hand, to adjust generator parameters in order
// to dynamically determine a set of tests to run and on the other hand,
// give the user a chance to inspect the generated tests with Google Test
// reflection API before RUN_ALL_TESTS() is executed.
//
// You can see samples/sample7_unittest.cc and samples/sample8_unittest.cc
// for more examples.
@@ -144,6 +149,32 @@ INSTANTIATE_TEST_CASE_P(AnotherInstantiationName, FooTest, ValuesIn(pets));
// In the future, we plan to publish the API for defining new parameter
// generators. But for now this interface remains part of the internal
// implementation and is subject to change.
//
//
// A parameterized test fixture must be derived from testing::Test and from
// testing::WithParamInterface<T>, where T is the type of the parameter
// values. Inheriting from TestWithParam<T> satisfies that requirement because
// TestWithParam<T> inherits from both Test and WithParamInterface. In more
// complicated hierarchies, however, it is occasionally useful to inherit
// separately from Test and WithParamInterface. For example:
class BaseTest : public ::testing::Test {
// You can inherit all the usual members for a non-parameterized test
// fixture here.
};
class DerivedTest : public BaseTest, public ::testing::WithParamInterface<int> {
// The usual test fixture members go here too.
};
TEST_F(BaseTest, HasFoo) {
// This is an ordinary non-parameterized test.
}
TEST_P(DerivedTest, DoesBlah) {
// GetParam works just the same here as if you inherit from TestWithParam.
EXPECT_TRUE(foo.Blah(GetParam()));
}
#endif // 0

27
include/gtest/gtest.h
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@@ -1589,9 +1589,13 @@ class GTEST_API_ AssertHelper {
} // namespace internal
#if GTEST_HAS_PARAM_TEST
// The abstract base class that all value-parameterized tests inherit from.
// The pure interface class that all value-parameterized tests inherit from.
// A value-parameterized class must inherit from both ::testing::Test and
// ::testing::WithParamInterface. In most cases that just means inheriting
// from ::testing::TestWithParam, but more complicated test hierarchies
// may need to inherit from Test and WithParamInterface at different levels.
//
// This class adds support for accessing the test parameter value via
// This interface has support for accessing the test parameter value via
// the GetParam() method.
//
// Use it with one of the parameter generator defining functions, like Range(),
@@ -1620,12 +1624,16 @@ class GTEST_API_ AssertHelper {
// INSTANTIATE_TEST_CASE_P(OneToTenRange, FooTest, ::testing::Range(1, 10));
template <typename T>
class TestWithParam : public Test {
class WithParamInterface {
public:
typedef T ParamType;
virtual ~WithParamInterface() {}
// The current parameter value. Is also available in the test fixture's
// constructor.
// constructor. This member function is non-static, even though it only
// references static data, to reduce the opportunity for incorrect uses
// like writing 'WithParamInterface<bool>::GetParam()' for a test that
// uses a fixture whose parameter type is int.
const ParamType& GetParam() const { return *parameter_; }
private:
@@ -1638,12 +1646,19 @@ class TestWithParam : public Test {
// Static value used for accessing parameter during a test lifetime.
static const ParamType* parameter_;
// TestClass must be a subclass of TestWithParam<T>.
// TestClass must be a subclass of WithParamInterface<T> and Test.
template <class TestClass> friend class internal::ParameterizedTestFactory;
};
template <typename T>
const T* TestWithParam<T>::parameter_ = NULL;
const T* WithParamInterface<T>::parameter_ = NULL;
// Most value-parameterized classes can ignore the existence of
// WithParamInterface, and can just inherit from ::testing::TestWithParam.
template <typename T>
class TestWithParam : public Test, public WithParamInterface<T> {
};
#endif // GTEST_HAS_PARAM_TEST

33
test/gtest-param-test_test.cc
View File

@@ -836,6 +836,39 @@ INSTANTIATE_TEST_CASE_P(InstantiationWithComments,
CommentTest,
Values(Unstreamable(1)));
// Verify that we can create a hierarchy of test fixtures, where the base
// class fixture is not parameterized and the derived class is. In this case
// ParameterizedDerivedTest inherits from NonParameterizedBaseTest. We
// perform simple tests on both.
class NonParameterizedBaseTest : public ::testing::Test {
public:
NonParameterizedBaseTest() : n_(17) { }
protected:
int n_;
};
class ParameterizedDerivedTest : public NonParameterizedBaseTest,
public ::testing::WithParamInterface<int> {
protected:
ParameterizedDerivedTest() : count_(0) { }
int count_;
static int global_count_;
};
int ParameterizedDerivedTest::global_count_ = 0;
TEST_F(NonParameterizedBaseTest, FixtureIsInitialized) {
EXPECT_EQ(17, n_);
}
TEST_P(ParameterizedDerivedTest, SeesSequence) {
EXPECT_EQ(17, n_);
EXPECT_EQ(0, count_++);
EXPECT_EQ(GetParam(), global_count_++);
}
INSTANTIATE_TEST_CASE_P(RangeZeroToFive, ParameterizedDerivedTest, Range(0, 5));
#endif // GTEST_HAS_PARAM_TEST
TEST(CompileTest, CombineIsDefinedOnlyWhenGtestHasParamTestIsDefined) {