why copy constructor called but not move constructor in c++11?

This is the C++ test I do. I thought move constructor would be called, but it's not.

class MyTest
{
public:
    MyTest() {}
    ~MyTest() {}
    MyTest(const MyTest& lv) {}     // be called actually 
    MyTest(MyTest&& rv) {}          // not be called actually, but i thought would
    void operator=(const MyTest& lv) {
        MyTest(std::move(lr));      // i thought the move constructor would be called here
    }
};
int main()
{
    MyTest m1;
    MyTest m2 = m1;
    return 0;
}