####### params: 2 numbers, output with numbers: number, output with non-numbers: null
####### params: 2 numbers, output with numbers: number, output with non-numbers: null
####### params: 2 numbers, output with numbers: number, output with non-numbers: null
####### params: 2 numbers, output with non-zero numbers: number, output with zeros: null, output with non-numbers: null
####### params: 1 string, output with string: string, output with non-string: null Usage Notes or examples
npm start
- How do you run tests?
- npm run test
- What assertions were made?
- no asserts, only expects
- What assertions need to be / should be made?
Link to an image of the UML for your application and response to events