Is this the right approach to unit testing?

Question

Unit testing

Guys, I greet you!
When I test class methods with a single constructor, I accordingly do this: I create an instance of an object of this class using a single constructor, and then I test the method / methods.
So I think, what if there are several constructors ... How should I test the methods then? First I create objects with one constructor and test the methods, and then I create with another constructor and test the same methods?