C++ 当GoogleTestFixture没有默认构造函数时，如何在其中定义变量？

我有以下几点

#include <semsim/Subject.h>
#include <semsim/Triple.h>
#include "gtest/gtest.h"

class TripleTests : public ::testing::Test {
public:

    std::string subject_str;
    semsim::Subject subject;

    void SetUp() override {
        subject_str = "./MyModel#metaid_0";
        subject = semsim::Subject(subject_str);
    }
};

TEST_F(TripleTests, TestSubjectMetaId) { // this line causes the error
    std::cout << subject << std::endl;
}

因此，我的问题是：在不需要定义默认构造函数的情况下，如何在

TripleTest

类中创建subject对象，以便在

TEST\F

函数中使用它？或者有必要在

Suject

中设置默认构造函数，以便在测试夹具中创建一个构造函数吗

作为参考，

主题

标题如下所示：

    class Subject {
    private:
        std::string metaId;

    public:

        explicit Subject(std::string metaId) : metaId(std::move(metaId)) {};

        const std::string &getMetaId() const;

        bool operator==(const Subject &rhs) const;

        bool operator!=(const Subject &rhs) const;

        friend std::ostream &operator<<(std::ostream &os, const Subject &subject);
    };

}

导致

Constructor for 'TripleTests' must explicitly initialize the member 'subject' which does not have a default constructor. Isn't the line `this->subject = s` initialising the member `subject`? 

---

您必须使用fixture的构造函数而不是

SetUp（）

来初始化初始化器列表中的成员：

class TripleTests : public ::testing::Test {
public:

    std::string subject_str;
    semsim::Subject subject;

    TripleTests() 
        : subject_str("./MyModel#metaid_0")
        , subject(subject_str)
    {
    }
};

Constructor for 'TripleTests' must explicitly initialize the member 'subject' which does not have a default constructor. Isn't the line `this->subject = s` initialising the member `subject`? 

class TripleTests : public ::testing::Test {
public:

    std::string subject_str;
    semsim::Subject subject;

    TripleTests() 
        : subject_str("./MyModel#metaid_0")
        , subject(subject_str)
    {
    }
};