Is mutation testing useful in practice?

Question

Do you have any examples of real life applications of mutation testing? Does it work better than simple test coverage tools? Or is it useless?

What are the advantage

Answer 1

The test case for the first one behaves differently due to above mutation there is an exception raised now. So it doesn’t returns the expected array of {6,3}. However, our second test case remains same, because it also includes positive number. So, it gives exception on positive numbers as well. Now, if we have to write a successful test case that would be Input ={-6,-6,-7,-3,-4} Expected = {-6,-3}