Testing Mastery: JUnit, Mockito & Integration Tests · Lesson

Implementing Step Definitions

Connect Gherkin feature files to executable code by writing step definitions using a BDD framework.

Step Definitions: The Code Bridge

In Behavior-Driven Development (BDD), Gherkin feature files describe behavior in plain language. But how does your application understand these instructions?

This is where Step Definitions come in! They are the crucial link, translating each Gherkin step (Given, When, Then) into executable code.

They are methods that match Gherkin patterns.
BDD frameworks (like Cucumber) find and run these methods.

Our Example: A Simple Calculator

Let's use a basic Calculator to demonstrate how step definitions work. This class will hold the state and logic that our steps will interact with.

Try running this simple calculator:

public class Calculator {
  private int result;

  public void add(int a, int b) {
    this.result = a + b;
  }

  public int getResult() {
    return result;
  }

  public void clear() {
    this.result = 0;
  }

  public static void main(String[] args) {
    Calculator calc = new Calculator();
    calc.add(10, 5);
    System.out.println("10 + 5 = " + calc.getResult());
  }
}

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