C++复制构造函数和 = 运算符重载

我正在尝试在C++中了解复制构造函数，运算符重载和析构函数。给定一个包含指向其自身类型的指针的类，如何编写复制构造函数或 = 运算符重载？我已经尝试了以下内容，但是在main中声明或分配测试对象时，我不断遇到分段错误。谁能解释我做错了什么？

class Test {
public:
    Test(string name);
    Test(const Test& testObject);
    Test& operator=(const Test& rhs);
    ~Test();
    string getName();
    void setName(string newname);
    Test* getNeighbor(int direction);
    void setNeighbor(Test* newTest, int direction);
private:
    string name;
    Test* neighbors[4];
};    
Test::Test() {
    name = "*";
    neighbors[4] = new Test[4];
}
Test::Test(const Test& testObject) {
    this->name = testObject.name;
    for (int i = 0; i < 4; i++) {
        this->neighbors[i] = testObject.neighbors[i];
    }
}
Test& Test::operator=(const Test& rhs) {
    if (this == &rhs) {
        return *this;
    }
    else {
        name = rhs.name;
        delete [] neighbors;
        for (int i = 0; i < 4; i++) {
            neighbors[i] = rhs.neighbors[i];
        }
        return *this;
    }
}