Unit test is crashing

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C++11

unit-testing

I have written some unit test cases using Gtest framework. If I am trying to test the class whose constructor is making the object of another class, GTest is crashing.

Code is as follows:

User1.cpp

class User1
{
    public:
           User1()
           {
                u = new User2();  //Line exp
           }
           ~User1()
           {
                delete u;
           }
    private:
          User2* u;
}

User2.cpp

class User2
{
     public:
           User2(){}
           ~User2(){}
}

Test Case:

TEST(test, InstantiateUser1)
{
     User1* u = new User1();
}

When I did debugging the test case, it was crashing at line exp (mentioned in comment).
Please help me out why is it happening and How can I resolve this problem?

What I have tried:

I searched a lot but not got anything relatable. I have no clue to solve this issue.