Test Class C++ template

#include <iostream>

template<typename X>
class Test {
private:
    X x;

public:
    Test (X x) : x(x) {}

    void f () {
        std::cout << x << std::endl;
    }
};

int main () {
    Test testA(5);               // 17| error: missing template arguments before ‘test’

    Test* testB = new Test(5);   // 19 | error: missing template arguments before ‘*’ token
                                 // 19 | error: ‘testB’ was not declared in this scope
                                 // 19 |error: expected type-specifier before ‘Test’

    return 0;
}