Unit Testing/Jest/Create a Simple Test

Create a JavaScript Program
Create the following JavaScript program. Save it as

Create a Test Program
Create the following Jest test program. Save it as

Test Success
Test the program by running Jest in a terminal or command prompt in the same folder as the two programs above and observe the results. npm test

Test Failure
Change the multiply source code somehow, such as multiplying by 0 rather than multiplying by y. Test the program by running Jest again and observe the results.