Counter Click TS

Simple counter using React TypeScript with Unit Testing using Jest and Enzyme

Challenges

One of the testing of this simple app was to apply the following scenario:

1. Decrement button

• Create a new button that subtracts 1 from the counter

2. No count below 0

• Don't let the counter go below zero.
• if the counter is at 0 and the decrement button is clicked:
  • don't decrement the counter
  • display an error message saying the counter can't go below zero

3. Remove error when increment button is clicked

• If error is showing and increment button is clicked, clear the error.