Cucumber hooks - http://jira.baeldung.com/browse/BAEL-3590

testing-modules/testing-libraries/src/main/java/com/baeldung/cucumberhooks/books/Book.java

@@ -0,0 +1,35 @@
+package com.baeldung.cucumberhooks.books;
+
+public class Book {
+
+    private String title;
+    private String author;
+    
+    public Book(String title, String author) {
+        this.title = title;
+        this.author = author;
+    }
+    
+    public Book() {}
+
+    public String getTitle() {
+        return title;
+    }
+    
+    public void setTitle(String title) {
+        this.title = title;
+    }
+    
+    public String getAuthor() {
+        return author;
+    }
+    
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    @Override
+    public String toString() {
+        return "Book [title=" + title + ", author=" + author + "]";
+    }
+}

testing-modules/testing-libraries/src/main/java/com/baeldung/cucumberhooks/books/BookStore.java

@@ -0,0 +1,28 @@
+package com.baeldung.cucumberhooks.books;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+public class BookStore {
+    private List<Book> books = new ArrayList<>();
+
+    public void addBook(Book book) {
+        books.add(book);
+    }
+
+    public void addAllBooks(Collection<Book> books) {
+        this.books.addAll(books);
+    }
+
+    public List<Book> booksByAuthor(String author) {
+        return books.stream()
+          .filter(book -> Objects.equals(author, book.getAuthor()))
+          .collect(Collectors.toList());
+    }
+
+    public Optional<Book> bookByTitle(String title) {
+        return books.stream()
+          .filter(book -> book.getTitle().equals(title))
+          .findFirst();
+    }
+}