ShoppingStepdefs.java

package cucumber.examples.java.calculator;

import cucumber.api.java.en.Given;
import cucumber.api.java.en.Then;
import cucumber.api.java.en.When;

import java.util.List;

import static org.junit.Assert.assertEquals;

public class ShoppingStepdefs {
  private RpnCalculator calc = new RpnCalculator();

  @Given("^the following groceries:$")
  public void the_following_groceries(List<Grocery> groceries) {
    for (Grocery grocery : groceries) {
      calc.push(grocery.price);
      calc.push("+");
    }
  }

  @When("^I pay (\\d+)$")
  public void i_pay(int amount) {
    calc.push(amount);
    calc.push("-");
  }

  @Then("^my change should be (\\d+)$")
  public void my_change_should_be_(int change) {
    assertEquals(-calc.value().intValue(), change);
  }

  public static class Grocery {
    public String name;
    public int price;
  }
}