committing code changes with a simple Junit test. corrected the project

structure as well.

hexagonal-example/pom.xml

@@ -1,47 +1,100 @@
 <?xml version="1.0" encoding="UTF-8"?>
+
 <project xmlns="http://maven.apache.org/POM/4.0.0"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
-	<parent>
+
-		<groupId>org.springframework.boot</groupId>
-		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.1.6.RELEASE</version>
-		<relativePath /> <!-- lookup parent from repository -->
-	</parent>
 	<groupId>com.baeldung</groupId>
-	<artifactId>HexagonalLibrary</artifactId>
+	<artifactId>hexagonalPattern</artifactId>
 	<version>0.0.1-SNAPSHOT</version>
-	<name>HexagonalLibrary</name>
+
-	<description>HexagonalLibrary</description>
+	<name>hexagonalPattern</name>
+	<!-- FIXME change it to the project's website -->
+	<!-- <url>http://www.example.com</url> -->
 
 	<properties>
 		<java.version>1.8</java.version>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>1.8</maven.compiler.source>
+		<maven.compiler.target>1.8</maven.compiler.target>
 	</properties>
 
 	<dependencies>
 		<dependency>
-			<groupId>org.springframework.boot</groupId>
+			<groupId>org.junit.jupiter</groupId>
-			<artifactId>spring-boot-starter-web</artifactId>
+			<artifactId>junit-jupiter-engine</artifactId>
+			<version>5.1.0</version>
+			<scope>test</scope>
 		</dependency>
-
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-test</artifactId>
+			<artifactId>spring-boot-starter-parent</artifactId>
+			<version>2.2.1.RELEASE</version>
+			<type>pom</type>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+			<version>2.2.1.RELEASE</version>
+		</dependency>
+		<dependency>
+			<groupId>org.mockito</groupId>
+			<artifactId>mockito-core</artifactId>
+			<version>2.26.0</version>
+		</dependency>
+		<dependency>
+			<groupId>org.mockito</groupId>
+			<artifactId>mockito-core</artifactId>
+			<version>2.22.0</version>
 			<scope>test</scope>
 		</dependency>
 	</dependencies>
 
 	<build>
+		<pluginManagement><!-- lock down plugins versions to avoid using Maven 
+				defaults (may be moved to parent pom) -->
 			<plugins>
+				<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
 				<plugin>
-				<groupId>org.springframework.boot</groupId>
+					<artifactId>maven-clean-plugin</artifactId>
-				<artifactId>spring-boot-maven-plugin</artifactId>
+					<version>3.1.0</version>
-				<configuration>
+				</plugin>
-					<mainClass>com.baeldung.HexagonalLibrary</mainClass>
+				<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
-				</configuration>
+				<plugin>
+					<artifactId>maven-resources-plugin</artifactId>
+					<version>3.0.2</version>
+				</plugin>
+				<plugin>
+					<artifactId>maven-compiler-plugin</artifactId>
+					<version>3.8.0</version>
+				</plugin>
+				<plugin>
+					<artifactId>maven-surefire-plugin</artifactId>
+					<version>2.22.1</version>
+				</plugin>
+				<plugin>
+					<artifactId>maven-jar-plugin</artifactId>
+					<version>3.0.2</version>
+				</plugin>
+				<plugin>
+					<artifactId>maven-install-plugin</artifactId>
+					<version>2.5.2</version>
+				</plugin>
+				<plugin>
+					<artifactId>maven-deploy-plugin</artifactId>
+					<version>2.8.2</version>
+				</plugin>
+				<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
+				<plugin>
+					<artifactId>maven-site-plugin</artifactId>
+					<version>3.7.1</version>
+				</plugin>
+				<plugin>
+					<artifactId>maven-project-info-reports-plugin</artifactId>
+					<version>3.0.0</version>
 				</plugin>
 			</plugins>
+		</pluginManagement>
 	</build>
-
 </project>

hexagonal-example/src/com/baeldung/HexagonalLibrary.java

@@ -1,13 +0,0 @@
-package com.baeldung;
-
-import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.SpringBootApplication;
-
-@SpringBootApplication
-public class HexagonalLibrary {
-
-	public static void main(String[] args) {
-		SpringApplication.run(HexagonalLibrary.class, args);
-	}
-
-}

hexagonal-example/src/com/baeldung/hexagonalPattern/adapter/LibraryRepoImpl.java

@@ -1,39 +0,0 @@
-package com.baeldung.hexagonalPattern.adapter;
-
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.stream.Collectors;
-
-import org.springframework.stereotype.Repository;
-
-import com.baeldung.hexagonalPattern.core.domain.Book;
-import com.baeldung.hexagonalPattern.ports.LibraryRepo;
-
-@Repository
-public class LibraryRepoImpl implements LibraryRepo {
-	// This class is the actual implementation of the out bound port/adapter.
-
-	private HashMap<String, Book> books = new HashMap<String, Book>();
-
-	@Override
-	public void insertBook(Book book) {
-		// Mock Database call here.
-		books.put("mock", new Book("mock", "mock", "mock"));
-	}
-
-	@Override
-	public Book searchBook(String name) {
-		// TODO Auto-generated method stub
-		Book b = new Book();
-		// Some code for retrieval of book from db
-		return b;
-	}
-
-	@Override
-	public List<Book> getAllBooks() {
-		// Fetch all books from db
-		return books.values().stream().collect(Collectors.toList());
-	}
-
-}

hexagonal-example/src/com/baeldung/hexagonalPattern/adapter/LibraryRestController.java

@@ -1,37 +0,0 @@
-package com.baeldung.hexagonalPattern.adapter;
-
-import java.util.List;
-
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.PathVariable;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
-
-import com.baeldung.hexagonalPattern.core.domain.Book;
-import com.baeldung.hexagonalPattern.web.LibraryRestUI;
-
-@RestController
-public class LibraryRestController implements LibraryRestUI {
-
-	@Override
-	@RequestMapping("/library")
-	public void insertBook(Book book) {
-		// TODO Auto-generated method stub
-
-	}
-
-	@Override
-	@GetMapping("/searchBook")
-	public Book searchBook(@PathVariable String name) {
-		// TODO Auto-generated method stub
-		return null;
-	}
-
-	@Override
-	@GetMapping("/listBooks")
-	public List<Book> listAllBooks() {
-		// TODO Auto-generated method stub
-		return null;
-	}
-
-}

hexagonal-example/src/com/baeldung/hexagonalPattern/core/domain/Book.java

@@ -1,33 +0,0 @@
-package com.baeldung.hexagonalPattern.core.domain;
-
-public class Book {
-
-	private String name;
-	private String author_list;
-	private String isbn13;
-
-	/* constructors and getter and setters */
-	public Book(String string, String string2, String string3) {
-		// TODO Auto-generated constructor stub
-	}
-
-	public Book() {
-		// TODO Auto-generated constructor stub
-	}
-
-	/*
-	 * public String getName() { return name; }
-	 * 
-	 * public void setName(String name) { this.name = name; }
-	 * 
-	 * public String getAuthor_list() { return author_list; }
-	 * 
-	 * public void setAuthor_list(String author_list) { this.author_list =
-	 * author_list; }
-	 * 
-	 * public String getIsbn13() { return isbn13; }
-	 * 
-	 * public void setIsbn13(String isbn13) { this.isbn13 = isbn13; }
-	 */
-
-}

hexagonal-example/src/com/baeldung/hexagonalPattern/core/impl/LibraryServiceImpl.java

@@ -1,38 +0,0 @@
-package com.baeldung.hexagonalPattern.core.impl;
-
-import java.util.List;
-
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.stereotype.Service;
-import com.baeldung.hexagonalPattern.core.domain.Book;
-import com.baeldung.hexagonalPattern.ports.LibraryRepo;
-import com.baeldung.hexagonalPattern.ports.LibraryService;
-
-@Service
-public class LibraryServiceImpl implements LibraryService {
-
-	// This is the class which actually implements the methods from the ports.
-	// The ports are just for exposing the methods to the outside.
-
-	@Autowired
-	private LibraryRepo bookRepo;
-
-	@Override
-	public void insertBook(Book book) {
-		// TODO some implementation to insert record in the db or similar
-		bookRepo.insertBook(book);
-	}
-
-	@Override
-	public Book lendBook(String name) {
-		// TODO Auto-generated method stub
-		return bookRepo.searchBook(name);
-	}
-
-	@Override
-	public List<Book> getAllBooks() {
-		// TODO Auto-generated method
-		return null;
-	}
-
-}

hexagonal-example/src/com/baeldung/hexagonalPattern/ports/LibraryService.java

@@ -1,15 +0,0 @@
-package com.baeldung.hexagonalPattern.ports;
-
-import java.util.List;
-import com.baeldung.hexagonalPattern.core.domain.Book;
-
-public interface LibraryService {
-//This is the in bound port.exposes the application to the world. 
-
-	public void insertBook(Book book);
-
-	public Book lendBook(String name);
-
-	List<Book> getAllBooks();
-
-}

hexagonal-example/src/main/java/com/baeldung/hexagonalPattern/HexagonalLibraryApplication.java

@@ -0,0 +1,11 @@
+package com.baeldung.hexagonalPattern;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class HexagonalLibraryApplication {
+    public static void main(String[] args) {
+	SpringApplication.run(HexagonalLibraryApplication.class, args);
+    }
+}

hexagonal-example/src/main/java/com/baeldung/hexagonalPattern/adapters/LibraryRepoImpl.java

@@ -0,0 +1,40 @@
+package com.baeldung.hexagonalPattern.adapters;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.hexagonalPattern.core.domain.Book;
+import com.baeldung.hexagonalPattern.ports.LibraryRepo;
+
+@Repository
+public class LibraryRepoImpl implements LibraryRepo {
+    // This class is the actual implementation of the out bound port/adapter.
+
+    private HashMap<String, Book> books = new HashMap<String, Book>();
+
+    @Override
+    public int insertBook(Book book) {
+	// Mock Database call here.
+	books.put("mock", new Book("mock", "mock", "mock"));
+	return 1;
+    }
+
+    @Override
+    public Book searchBook(String name) {
+	// TODO Auto-generated method stub
+	Book b = new Book();
+	// Some code for retrieval of book from db
+	return b;
+    }
+
+    @Override
+    public List<Book> getAllBooks() {
+	// Fetch all books from db
+	return books.values().stream().collect(Collectors.toList());
+    }
+
+}

hexagonal-example/src/main/java/com/baeldung/hexagonalPattern/adapters/LibraryRestController.java

@@ -0,0 +1,38 @@
+package com.baeldung.hexagonalPattern.adapters;
+
+import java.util.List;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.hexagonalPattern.core.domain.Book;
+import com.baeldung.hexagonalPattern.web.LibraryRestUI;
+
+@RestController
+@RequestMapping("/library")
+public class LibraryRestController implements LibraryRestUI {
+
+    @Override
+    @PostMapping("/insertBook")
+    public int insertBook(Book book) {
+	return 0;
+    }
+
+    @Override
+    @GetMapping("/searchBook")
+    public Book searchBook(@PathVariable String name) {
+	// TODO Auto-generated method stub
+	return null;
+    }
+
+    @Override
+    @GetMapping("/listBooks")
+    public List<Book> listAllBooks() {
+	// TODO Auto-generated method stub
+	return null;
+    }
+
+}

hexagonal-example/src/main/java/com/baeldung/hexagonalPattern/core/domain/Book.java

@@ -0,0 +1,33 @@
+package com.baeldung.hexagonalPattern.core.domain;
+
+public class Book {
+
+    private String name;
+    private String author_list;
+    private String isbn13;
+
+    /* constructors and getter and setters */
+    public Book(String string, String string2, String string3) {
+	// TODO Auto-generated constructor stub
+    }
+
+    public Book() {
+	// TODO Auto-generated constructor stub
+    }
+
+    /*
+     * public String getName() { return name; }
+     * 
+     * public void setName(String name) { this.name = name; }
+     * 
+     * public String getAuthor_list() { return author_list; }
+     * 
+     * public void setAuthor_list(String author_list) { this.author_list =
+     * author_list; }
+     * 
+     * public String getIsbn13() { return isbn13; }
+     * 
+     * public void setIsbn13(String isbn13) { this.isbn13 = isbn13; }
+     */
+
+}

hexagonal-example/src/main/java/com/baeldung/hexagonalPattern/core/impl/LibraryServiceImpl.java

@@ -0,0 +1,33 @@
+package com.baeldung.hexagonalPattern.core.impl;
+
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import com.baeldung.hexagonalPattern.adapters.LibraryRepoImpl;
+import com.baeldung.hexagonalPattern.core.domain.Book;
+import com.baeldung.hexagonalPattern.ports.LibraryService;
+
+@Service
+public class LibraryServiceImpl implements LibraryService {
+
+    @Autowired
+    private LibraryRepoImpl bookRepo = new LibraryRepoImpl();
+
+    @Override
+    public int insertBook(Book book) {
+	bookRepo.insertBook(book);
+	return 1;
+    }
+
+    @Override
+    public Book searchBook(String name) {
+	return bookRepo.searchBook(name);
+    }
+
+    @Override
+    public List<Book> getAllBooks() {
+	return bookRepo.getAllBooks();
+    }
+}

hexagonal-example/src/main/java/com/baeldung/hexagonalPattern/ports/LibraryRepo.java

@@ -4,9 +4,8 @@ import java.util.List;
 import com.baeldung.hexagonalPattern.core.domain.Book;
 
 public interface LibraryRepo {
-	// Outbound Port.
 
-	public void insertBook(Book book);
+    public int insertBook(Book book);
 
     public Book searchBook(String name);
 

hexagonal-example/src/main/java/com/baeldung/hexagonalPattern/ports/LibraryService.java

@@ -0,0 +1,15 @@
+package com.baeldung.hexagonalPattern.ports;
+
+import java.util.List;
+
+import com.baeldung.hexagonalPattern.core.domain.Book;
+
+public interface LibraryService {
+
+    public int insertBook(Book book);
+
+    public Book searchBook(String name);
+
+    public List<Book> getAllBooks();
+
+}

hexagonal-example/src/main/java/com/baeldung/hexagonalPattern/web/LibraryRestUI.java

@@ -13,9 +13,9 @@ public interface LibraryRestUI {
     // This is the in bound Adapter
 
     @PostMapping
-	void insertBook(@RequestBody Book book);
+    public int insertBook(@RequestBody Book book);
 
-	@GetMapping("/{name}")
+    @GetMapping
     public Book searchBook(@PathVariable String name);
 
     @GetMapping

hexagonal-example/src/test/java/com/baeldung/hexagonalPattern/HexagonalLibraryApplicationTest.java

@@ -0,0 +1,46 @@
+package com.baeldung.hexagonalPattern;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import com.baeldung.hexagonalPattern.core.domain.Book;
+import com.baeldung.hexagonalPattern.core.impl.LibraryServiceImpl;
+
+@RunWith(MockitoJUnitRunner.class)
+public class HexagonalLibraryApplicationTest {
+
+    @Mock
+    private LibraryServiceImpl libService = org.mockito.Mockito.mock(LibraryServiceImpl.class);;
+    Book bk = new Book();
+    Book book;
+
+    @Test
+    public void testInsertBook() {
+	Mockito.when(libService.insertBook(bk)).thenReturn(1);
+	int returnVal = libService.insertBook(bk);
+	assertEquals(1, returnVal);
+    }
+
+    @Test
+    public void testSearchBook() {
+	Book returnBook = new Book();
+	Mockito.lenient().when(libService.searchBook("Pride and Prejudice")).thenReturn(returnBook);
+	assertNotNull(returnBook);
+    }
+
+    @Test
+    public void testGetAllBooks() {
+	List<Book> returnBookList = new ArrayList<Book>();
+	returnBookList = libService.getAllBooks();
+	assertNotNull(returnBookList);
+    }
+}