package com.twu.biblioteca;


import org.junit.Test;
import static org.junit.Assert.assertEquals;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.lang.StringBuilder;
import java.util.List;
import java.util.ArrayList;

public class BibliotecaAppTest {

    @Test
    public void testBibliotecaStartup() {
        List<String> bookList = new ArrayList<String>();
        bookList.add("Test-Driven Development By Example");
        bookList.add("The Agile Samurai");
        bookList.add("Head First Java");
        bookList.add("Don't Make Me Think, Revisited: A Common Sense Approach to Web Usability");

        StringBuilder startupOutput = new StringBuilder();
        startupOutput.append("Welcome to Biblioteca!\n");
        startupOutput.append("Book list:\n");
        for (String book : bookList) {
            startupOutput.append(book + "\n");
        }

        ByteArrayOutputStream outContent = new ByteArrayOutputStream();
        System.setOut(new PrintStream(outContent));
        BibliotecaApp.main(new String[] {});

        assertEquals(startupOutput.toString(), outContent.toString());
    }
}

package com.twu.biblioteca;


import org.junit.Test;
import static org.junit.Assert.assertEquals;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.lang.StringBuilder;
import java.util.List;
import java.util.ArrayList;
import java.util.Formatter;

public class BibliotecaAppTest {

    @Test
    public void testBibliotecaStartup() {
        StringBuilder expectedOutput = new StringBuilder();

        expectedOutput.append("Welcome to Biblioteca!\n");
        expectedOutput.append(printBookList());

        ByteArrayOutputStream outContent = new ByteArrayOutputStream();
        System.setOut(new PrintStream(outContent));
        BibliotecaApp.main(new String[] {});

        assertEquals(expectedOutput.toString(), outContent.toString());
    }

    private String printBookList() {
        List<Book> bookList = generateBookList();
        StringBuilder output = new StringBuilder();
        output.append("Book List:");

        String leftAlignFormat = "%-32s | %-32s | %-4d\n";
        output.append(String.format(leftAlignFormat, "Title", "Author", "Year Published"));
        for (List<Book> book : bookList) {
            output.append(String.format(leftAlignFormat, book.getTitle(), book.getAuthor(), book.getYearPublished()));
        }
        return output.toString();
    }

    private List<Book> generateBookList() {
        List<Book> bookList = new ArrayList<Book>();
        bookList.add(new Book("Test-Driven Development By Example", "Kent Beck", 2003));
        bookList.add(new Book("The Agile Samurai", "Jonathan Rasmusson", 2010));
        bookList.add(new Book("Head First Java", "Kathy Sierra & Bert Bates", 2005));
        bookList.add(new Book("Don't Make Me Think, Revisited: A Common Sense Approach to Web Usability", "Steve Krug", 2014));
        return bookList;
    }
}

Test printing book list with author and publish year