Fundamentals of BDD with three steps : discovery, formulate, automation.
With this article, I’ll walk through the behaviour-driven development methodology.
Let’s jump straight in with an example of a behavioural test for a cash machine.
The first thing to notice is that the test is written in plain English.
The second thing to notice is the test is made of three different sections:
- Given : it’s the arrangement of context state — the starting state
- When : it’s the event, a trigger or when a user does something
- Then : it’s the outcome with the expected results
Once scenarios are ready, the development team can begin their work. Each of the tests will be running — and in the absence of any code — they would fail. The developers start writing code. As more code is written the tests will begin to turn from red to green. When they are all green, the job is done.
