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Imagine you have a simple field formatting a credit card number in packets of 4 digits
🖼️GUI:
⚙️Controller:
A unit test follows the '3 As' rule: Arrange, Act, and Assert.
Let's follow these steps in testing a React input field by faking the input filling, then reading it and comparing the outcome with what is expected.
🧪Unit test:
👨💻Code repo: