Initial (procedural) implementation and unit tests.

.gitignore

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+bin
+.classpath
+.project
+.settings

src/com/aquiles/alexandre/Customer.java

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+package com.aquiles.alexandre;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+public class Customer {
+
+	private String name;
+	private Collection<Rental> rentals;
+
+	public Customer(String name) {
+		super();
+		rentals = new ArrayList<Rental>();
+		this.name = name;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void addRental(Rental rental) {
+		rentals.add(rental);
+	}
+
+	public String statement() {
+		double totalAmount = 0;
+		int frequentRenterPoints = 0;
+		String result = "Rental record for " + getName() + "\n";
+		for(Rental rental : rentals) {
+			double thisAmount = 0;
+			switch(rental.getMovie().getPriceCode()) {
+			case Movie.REGULAR:
+				thisAmount += 2;
+				if(rental.getDaysRented() > 2)
+					thisAmount += (rental.getDaysRented() - 2) * 1.5;
+				break;
+			case Movie.NEW_RELEASE:
+				thisAmount += rental.getDaysRented() * 3;
+				break;
+			case Movie.CHILDRENS:
+				thisAmount += 1.5;
+				if(rental.getDaysRented() > 3)
+					thisAmount += (rental.getDaysRented() - 3) * 1.5;
+				break;
+			}
+
+			//add frequent renter points
+			frequentRenterPoints++;
+
+			//add bonus for a two day new release rental
+			if(rental.getMovie().getPriceCode() == Movie.NEW_RELEASE && rental.getDaysRented() > 1)
+				frequentRenterPoints++;
+
+			//show figures for this rental
+			result += "\t" + rental.getMovie().getTitle() + "\t" + String.valueOf(thisAmount) + "\n";
+			totalAmount += thisAmount;
+		}
+
+		//add footer lines
+		result += "Amount owed is " + String.valueOf(totalAmount) + "\n";
+		result += "You earned " + String.valueOf(frequentRenterPoints) + " frequent renter points";
+		return result;
+	}
+}

src/com/aquiles/alexandre/Movie.java

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+package com.aquiles.alexandre;
+
+public class Movie {
+
+	public static final int REGULAR = 0;
+	public static final int NEW_RELEASE = 1;
+	public static final int CHILDRENS = 2;
+
+	private String title;
+	private Integer priceCode;
+
+	public Movie(String title, Integer priceCode) {
+		super();
+		this.title = title;
+		this.priceCode = priceCode;
+	}
+
+	public Integer getPriceCode() {
+		return priceCode;
+	}
+
+	public void setPriceCode(Integer priceCode) {
+		this.priceCode = priceCode;
+	}
+
+	public String getTitle() {
+		return title;
+	}
+
+
+
+}

src/com/aquiles/alexandre/Rental.java

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+package com.aquiles.alexandre;
+
+
+public class Rental {
+
+	private Movie movie;
+	private Integer daysRented;
+
+	public Rental(Movie movie, Integer daysRented) {
+		super();
+		this.movie = movie;
+		this.daysRented = daysRented;
+	}
+
+	public Movie getMovie() {
+		return movie;
+	}
+
+	public Integer getDaysRented() {
+		return daysRented;
+	}
+
+
+}

src/com/aquiles/alexandre/RentalTest.java

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+package com.aquiles.alexandre;
+
+import java.util.Formatter;
+import java.util.LinkedHashMap;
+import java.util.Locale;
+import java.util.Map;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class RentalTest {
+
+	@Test
+	public void shortRegularRental() {
+		Customer customer = createCustomer();
+		addRental(customer, "Groundhog Day", Movie.REGULAR, 2);
+
+		String expected = 
+				new StatementConfig()
+				.addPartialAmount("Groundhog Day", 2.0)
+				.addTotalAmount(2.0)
+				.addFrequentRenterPoints(1)
+				.expectedStatement();
+
+		Assert.assertEquals(expected, customer.statement());
+	} 
+
+	@Test
+	public void longRegularRental() {
+		Customer customer = createCustomer();
+		addRental(customer, "Groundhog Day", Movie.REGULAR, 3);
+
+		String expected = 
+				new StatementConfig()
+				.addPartialAmount("Groundhog Day", 3.5)
+				.addTotalAmount(3.5)
+				.addFrequentRenterPoints(1)
+				.expectedStatement();
+
+		Assert.assertEquals(expected, customer.statement());
+	} 
+
+	@Test
+	public void shortNewReleaseRental() {
+		Customer customer = createCustomer();
+		addRental(customer, "X-Men X", Movie.NEW_RELEASE, 1);
+
+		String expected = 
+				new StatementConfig()
+				.addPartialAmount("X-Men X", 3.0)
+				.addTotalAmount(3.0)
+				.addFrequentRenterPoints(1)
+				.expectedStatement(); 
+
+		Assert.assertEquals(expected, customer.statement());
+	} 
+
+	@Test
+	public void longNewReleaseRental() {
+		Customer customer = createCustomer();
+		addRental(customer, "X-Men X", Movie.NEW_RELEASE, 2);
+
+		String expected = 
+					new StatementConfig()
+					.addPartialAmount("X-Men X", 6.0)
+					.addTotalAmount(6.0)
+					.addFrequentRenterPoints(2)
+					.expectedStatement();
+
+		Assert.assertEquals(expected, customer.statement());
+	} 
+
+	@Test
+	public void shortChildrensRental() {
+		Customer customer = createCustomer();
+		addRental(customer, "Toy Story", Movie.CHILDRENS, 3);
+
+		String expected = 
+				new StatementConfig()
+				.addPartialAmount("Toy Story", 1.5)
+				.addTotalAmount(1.5)
+				.addFrequentRenterPoints(1)
+				.expectedStatement();
+
+		Assert.assertEquals(expected, customer.statement());
+	} 
+
+	@Test
+	public void longChildrensRental() {
+		Customer customer = createCustomer();
+		addRental(customer, "Toy Story", Movie.CHILDRENS, 4);
+
+		String expected = 
+				new StatementConfig()
+				.addPartialAmount("Toy Story", 3.0)
+				.addTotalAmount(3.0)
+				.addFrequentRenterPoints(1)
+				.expectedStatement();
+
+		Assert.assertEquals(expected, customer.statement());
+	}
+
+	@Test
+	public void variousRentals() {
+		Customer customer = createCustomer();
+		addRental(customer, "Groundhog Day", Movie.REGULAR, 3);
+		addRental(customer, "X-Men X", Movie.NEW_RELEASE, 2);
+		addRental(customer, "Toy Story", Movie.CHILDRENS, 4);
+
+		String expected = 
+				new StatementConfig()
+				.addPartialAmount("Groundhog Day", 3.5)
+				.addPartialAmount("X-Men X", 6.0)
+				.addPartialAmount("Toy Story", 3.0)
+				.addTotalAmount(12.5)
+				.addFrequentRenterPoints(4)
+				.expectedStatement();
+
+		Assert.assertEquals(expected, customer.statement());
+	} 
+
+	@Test
+	public void expectedStatementTest() {
+		String result = new StatementConfig().addPartialAmount("Groundhog Day", 3.0).addTotalAmount(3.0).addFrequentRenterPoints(1).expectedStatement();
+		String expected = "Rental record for Luke\n";
+		expected += "\tGroundhog Day\t3.0\n";
+		expected += "Amount owed is 3.0\n";
+		expected += "You earned 1 frequent renter points";
+		Assert.assertEquals(expected, result);
+	}
+
+	private Customer createCustomer(){
+		return new Customer("Luke");
+	}
+
+	private void addRental(Customer customer, String movieName, Integer priceCode, Integer daysRented) {
+		Movie movie = new Movie(movieName, priceCode);
+		Rental rental = new Rental(movie, daysRented);
+		customer.addRental(rental);
+	} 
+
+}
+
+class StatementConfig {
+	private Map<String, Double> partialAmountsByMovieName;
+	private Double totalAmount;
+	private Integer frequentRenterPoints;
+
+	public StatementConfig() {
+		this.partialAmountsByMovieName = new LinkedHashMap<String, Double>(); 
+	}
+
+	public StatementConfig addPartialAmount(String movieName, Double partialAmount) {
+		partialAmountsByMovieName.put(movieName, partialAmount);
+		return this;
+	}
+
+	public StatementConfig addTotalAmount(Double totalAmount) {
+		this.totalAmount = totalAmount;
+		return this;
+	}
+
+	public StatementConfig addFrequentRenterPoints(Integer frequentRenterPoints) {
+		this.frequentRenterPoints = frequentRenterPoints;
+		return this;
+	}
+
+	public String expectedStatement() {
+		String format = "Rental record for Luke\n";
+		for (int i= 0; i < partialAmountsByMovieName.size(); i++) {
+			format += "\t%s\t%.1f\n";
+		}
+		format += "Amount owed is %.1f\n";
+		format += "You earned %d frequent renter points";
+
+		Formatter formatter = new Formatter();
+		formatter.format(Locale.US, format, getParameters());
+
+		return formatter.toString();
+	}
+
+	private Object[] getParameters() {
+		Object[] parameters = new Object[2*partialAmountsByMovieName.size()+2];
+		int i = -1;
+		for(String movieName : partialAmountsByMovieName.keySet()) {
+			parameters[++i] = movieName;
+			parameters[++i] = partialAmountsByMovieName.get(movieName);
+		}
+		parameters[++i] = totalAmount;
+		parameters[++i] = frequentRenterPoints;
+		return parameters;
+	}
+
+}