Seeing It in Action
OK. So these are the three test cases we are going to TDD out.
We will just take these logically in the order a user would as if they were using the calculator. Let’s start with entering a single number.
Step 1: Write a Failing Test
Show time. Time to put your design beret on and see if you can’t write a test that does two things:
- Verifies our calculator can take a single number
- Then returns the result (which for us will always be the last number added or operated on)
Take a moment and try writing a unit test that could do that. ...
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