Question

我有一个小班：

template <class key_t, class value_t>
class node_t {
public:
    node_t();
    void set_key(key_t);
    key_t get_key();
    void set_value(value_t);
    value_t get_value();

private:
    key_t key;
    value_t value;
};

template <class key_t, class value_t>
node_t<key_t, value_t>::node_t() {
    key = (key_t)0;
    value = (value_t)0;
}

template <class key_t, class value_t>
void node_t<key_t, value_t>::set_key(key_t key) {
    this->key = key;
}

template <class key_t, class value_t>
key_t node_t<key_t, value_t>::get_key() {
    return this->key;
}

template <class key_t, class value_t>
void node_t<key_t, value_t>::set_value(value_t value) {
    this->value = value;
}

template <class key_t, class value_t>
value_t node_t<key_t, value_t>::get_value() {
    return this->value;
}

如何使用Google测试框架对其进行测试？

/*
TEST(node_test_t, node_test) {
    node_t<std::string, float> node;

    std::string key = node.get_key();
    ASSERT_STREQ(key, 0);

    node.set_key("one");
    ASSERT_STREQ(node.get_key(), "one");

    float value = node.get_value();
    ASSERT_EQ(value, 0);

    node.set_value(2.4);
    ASSERT_EQ(node.get_value(), 2.4);
}
*/

// Updated
TEST(node_test_t, node_test)
{
    node_t<std::string, float> node;

    std::string key = node.get_key();
    ASSERT_STREQ("0", key.c_str());

    node.set_key("one");
    ASSERT_STREQ("one", node.get_key().c_str());

    float value = node.get_value();
    ASSERT_EQ(value, 0);

    node.set_value(2.4f);
    ASSERT_EQ(node.get_value(), 2.4f);
}

我也找到了：

How to test c++ template class with multiple template parameters using gtest?
gtest - testing template class
https://googletest.googlecode.com/svn/trunk/samples/sample6_unittest.cc

但是我无法编译结果。请举例说明如何使用Google Testing Framework为此课程编写测试。

UPD：我也试过这个：https://groups.google.com/forum/#!searchin/googletestframework/class $ 20template / googletestframework / wSlsjwU7vls / 9ulYoFliuLgJ

template <class key_t, class value_t>
class node_testing_t : public node_t<key_t, value_t> {
public:
    using node_t<key_t, value_t>::get_value;
};

TEST(node_test_case, get_value) {
    node_testing_t<std::string, float> node_testing;
    ASSERT_EQ(0, node_testing.get_value());
}

我也有LNK2019错误：

1>------ Skipped Build: Project: RUN_TESTS, Configuration: Debug Win32 ------
1>Project not selected to build for this solution configuration 
2>------ Build started: Project: googlemock, Configuration: Debug Win32 ------
3>------ Build started: Project: tests, Configuration: Debug Win32 ------
3>node_test.obj : error LNK2019: unresolved external symbol "public: __thiscall node_t<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,float>::node_t<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,float>(void)" (??0?$node_t@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@M@@QAE@XZ) referenced in function "public: __thiscall node_testing_t<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,float>::node_testing_t<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,float>(void)" (??0?$node_testing_t@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@M@@QAE@XZ)
3>node_test.obj : error LNK2019: unresolved external symbol "public: __thiscall node_t<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,float>::~node_t<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,float>(void)" (??1?$node_t@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@M@@QAE@XZ) referenced in function "public: __thiscall node_testing_t<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,float>::~node_testing_t<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,float>(void)" (??1?$node_testing_t@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@M@@QAE@XZ)
3>node_test.obj : error LNK2019: unresolved external symbol "public: float __thiscall node_t<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,float>::get_value(void)" (?get_value@?$node_t@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@M@@QAEMXZ) referenced in function "private: virtual void __thiscall node_test_case_get_value_Test::TestBody(void)" (?TestBody@node_test_case_get_value_Test@@EAEXXZ)
3>C:\Users\user\Desktop\hill-climbing\bin\tests.exe : fatal error LNK1120: 3 unresolved externals
4>------ Skipped Build: Project: ALL_BUILD, Configuration: Debug Win32 ------
4>Project not selected to build for this solution configuration 
========== Build: 1 succeeded, 1 failed, 2 up-to-date, 2 skipped ==========

Answer 1

您是否阅读了ASSERT_STREQ文档？此宏接受两个C-strings，您尝试先将std::string和int传递给第std::string和C-string。顺便说一下，第一个参数是预期值，第二个参数是实际值，因此您可能想要切换提供参数的顺序。

TEST(node_test_t, node_test)
{
    node_t<std::string, float> node;

    std::string key = node.get_key();
    ASSERT_STREQ("0", key.c_str());

    node.set_key("one");
    ASSERT_STREQ("one", node.get_key().c_str());

    float value = node.get_value();
    ASSERT_EQ(value, 0);

    node.set_value(2.4f);
    ASSERT_EQ(node.get_value(), 2.4f);
}

P.S。如果您要比较std::string个对象，可以使用EXPECT_EQ，EXPECT_NE等。

Answer 2

我在linux上使用gcc 4.8.4尝试了你的例子并且没有链接问题，尽管测试执行失败，因为node对象构造引发了异常，因为key = (key_t)0行中的行0构造函数尝试将std::string强制转换为node_test.obj对象。

那就是说，在你的情况下，MSVC链接器抱怨在node_t<std::string, float>文件中有与using node_string_float_t = node_t<std::string, float>; TEST(node_test_t, node_test) { node_string_float_t node; std::string key = node.get_key(); ASSERT_STREQ("0", key.c_str()); node.set_key("one"); ASSERT_STREQ("one", node.get_key().c_str()); float value = node.get_value(); ASSERT_EQ(value, 0); node.set_value(2.4f); ASSERT_EQ(node.get_value(), 2.4f); }相关的符号的未解析引用，即构造函数，析构函数和get_value（）成员函数。只是你测试中使用的那些。

您正在测试用例范围内实例化模板，尝试在外部范围内执行此操作。

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如何使用GTest测试带有多个模板参数的C ++模板类？

2 个答案: