Atm.java

package se.raindance.mp.export.job;

import java.util.Locale;

public class Atm {


	public static final String INSERT_PIN_RESPONSE = "Enter pincode";
	public static final String CHANGE_LANGUAGE = "Change Language";
	public static final String ENGLISH_GREETING = "Hello!";
	public static final String FRENCH_GREETING = "Bonjour!";
	public static final String INSERT_CARD = "Please insert card";

	private OperationalState cardState = OperationalState.NO_CARD;

	public String insertCard(String string) {
		cardState = OperationalState.HAS_CARD;
		return INSERT_PIN_RESPONSE;
	}

	public String insertPincode(int pincode) {
		if (cardState == OperationalState.HAS_CARD) {
			return CHANGE_LANGUAGE;
		}
		return INSERT_CARD;
	}

	public String changeLanguage(Locale chosenLanguage) {
		if (Locale.ENGLISH == chosenLanguage) {
			return ENGLISH_GREETING;
		}

		if (Locale.FRENCH == chosenLanguage) {
			return FRENCH_GREETING;
		}
		return null;
	}

}

AtmTest.java

package se.raindance.mp.export.job;

import java.util.Locale;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

public class AtmTest {
	Atm atm;

	@Before
	public void before() throws Exception {
		atm = new Atm();
	}

	@Test
	public void insert_card_should_prompt_for_pincode() throws Exception {
		String atmResponse = atm.insertCard("my visa");
		Assert.assertEquals("a request for pincode was expected", Atm.INSERT_PIN_RESPONSE, atmResponse);
	}

	@Test
	public void insert_pincode_should_prompt_for_change_language() throws Exception {
		atm.insertCard("cart");
		String atmResponse = atm.insertPincode(1234);
		Assert.assertEquals("a language change question was expected", Atm.CHANGE_LANGUAGE, atmResponse);
	}

	@Test
	public void change_language_should_greet_in_chosen_language_english() throws Exception {

		String atmResponse = atm.changeLanguage(Locale.ENGLISH);
		Assert.assertEquals("an english greeting was expected", Atm.ENGLISH_GREETING, atmResponse);

	}

	@Test
	public void change_language_should_greet_in_chosen_language_french() throws Exception {
		String atmResponse = atm.changeLanguage(Locale.FRENCH);
		Assert.assertEquals("an english greeting was expected", Atm.FRENCH_GREETING, atmResponse);

	}

	@Test
	public void _when_press_pin_and_no_card_prompt_to_insert_card() throws Exception {
		String atmResponse = atm.insertPincode(1234);
		Assert.assertEquals("a prompt to insert card was expected", Atm.INSERT_CARD, atmResponse);

	}

}