ignore model classes for test coverage

database cleanup

pom.xml

@@ -20,7 +20,9 @@
 		<spring-cloud.version>Hoxton.M3</spring-cloud.version>
 		<surefire.and.failsafe.report.dir>target/test-report</surefire.and.failsafe.report.dir>
 		<code.coverage.exclusions>
-			**/io/wkrzywiec/hexagonal/library/domain/book/dto/**,
+			**/io/wkrzywiec/hexagonal/library/borrowing/model/**,
+			**/io/wkrzywiec/hexagonal/library/email/model/**,
+			**/io/wkrzywiec/hexagonal/library/inventory/model/**,
 			**/io/wkrzywiec/hexagonal/library/infrastructure/repository/*Entity.java
 		</code.coverage.exclusions>
 	</properties>
@@ -131,6 +133,10 @@
 				</executions>
 				<configuration>
 					<reportsDirectory>${surefire.and.failsafe.report.dir}</reportsDirectory>
+					<includes>
+						<include>**/*ITCase.java</include>
+						<include>**/*ComponentTest.java</include>
+					</includes>
 				</configuration>
 			</plugin>
 			<plugin>

src/component-test/java/io/wkrzywiec/hexagonal/library/borrowing/MakeReservationComponentTest.java

@@ -0,0 +1,78 @@
+package io.wkrzywiec.hexagonal.library.borrowing;
+
+import io.restassured.RestAssured;
+import io.wkrzywiec.hexagonal.library.TestData;
+import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservationCommand;
+import io.wkrzywiec.hexagonal.library.inventory.infrastructure.BookRepository;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.test.context.jdbc.Sql;
+
+import static io.restassured.RestAssured.given;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.springframework.test.context.jdbc.Sql.ExecutionPhase.AFTER_TEST_METHOD;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+public class MakeReservationComponentTest {
+
+    @LocalServerPort
+    private int port;
+
+    @Autowired
+    private BookRepository bookRepository;
+
+    @Autowired
+    private JdbcTemplate jdbcTemplate;
+
+    private String baseURL;
+
+    @BeforeEach
+    public void init() {
+        this.baseURL = "http://localhost:" + port;
+        RestAssured.enableLoggingOfRequestAndResponseIfValidationFails();
+    }
+
+    @Test
+    @DisplayName("Reserve available book")
+    @Sql({"/book-and-user.sql", "/available-book.sql"})
+    @Sql(scripts = "/clean-database.sql", executionPhase = AFTER_TEST_METHOD)
+    public void givenBookIsAvailable_thenMakeReservation_thenBookIsReserved() {
+        //given
+        Long homoDeusBookId = jdbcTemplate.queryForObject(
+                "SELECT id FROM book WHERE title = ?",
+                Long.class,
+                TestData.homoDeusBookTitle());
+
+        Long activeUserId = jdbcTemplate.queryForObject(
+                "SELECT id FROM user WHERE email = ?",
+                Long.class,
+                "john.doe@test.com");
+
+        BookReservationCommand reservationCommand =
+                BookReservationCommand.builder()
+                .bookId(homoDeusBookId )
+                .userId(activeUserId)
+                .build();
+
+        //when
+        given()
+                .contentType("application/json")
+                .body(reservationCommand)
+        .when()
+                .post( baseURL + "/reservations")
+                .prettyPeek()
+        .then();
+
+        Long reservationId = jdbcTemplate.queryForObject(
+                "SELECT id FROM reserved WHERE book_id = ?",
+                Long.class,
+                homoDeusBookId);
+
+        assertTrue(reservationId > 0);
+    }
+}

src/component-test/java/io/wkrzywiec/hexagonal/library/inventory/AddNewBookComponentTest.java

@@ -4,7 +4,6 @@ import io.restassured.RestAssured;
 import io.restassured.response.ValidatableResponse;
 import io.wkrzywiec.hexagonal.library.TestData;
 import io.wkrzywiec.hexagonal.library.inventory.model.AddNewBookCommand;
-
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
@@ -12,16 +11,16 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.web.server.LocalServerPort;
 import org.springframework.http.HttpStatus;
-import org.springframework.jdbc.core.BeanPropertyRowMapper;
 import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.test.context.jdbc.Sql;
 
 import static io.restassured.RestAssured.given;
 import static org.hamcrest.Matchers.greaterThan;
-
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.springframework.test.context.jdbc.Sql.ExecutionPhase.AFTER_TEST_METHOD;
 
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
-public class AddNewBookTest {
+public class AddNewBookComponentTest {
 
     @LocalServerPort
     private int port;
@@ -55,8 +54,9 @@ public class AddNewBookTest {
     }
 
     @Test
-    @DisplayName("Add new book to a database")
-    public void givenGoogleBooId_whenAddNewBook_thenBookIsSaved(){
+    @DisplayName("Add new book to a database & make it available")
+    @Sql(scripts = "/clean-database.sql", executionPhase = AFTER_TEST_METHOD)
+    public void givenGoogleBooId_whenAddNewBook_thenBookIsSaved() {
         //given
         AddNewBookCommand addNewBookCommand =
                 AddNewBookCommand.builder()
@@ -77,6 +77,14 @@ public class AddNewBookTest {
                 "SELECT id FROM book WHERE book_external_id = ?",
                 Long.class,
                 TestData.homoDeusBookGoogleId());
+
         assertTrue(savedBookId > 0);
+
+        Long availableBookId = jdbc.queryForObject(
+                "SELECT id FROM available WHERE book_id = ?",
+                Long.class,
+                savedBookId);
+
+        assertTrue(availableBookId > 0);
     }
 }

src/component-test/resources/application.yml

@@ -4,4 +4,4 @@ spring:
     driverClassName: org.h2.Driver
     username: sa
     password: password
-    jpa.database-platform: org.hibernate.dialect.H2Dialect
+    jpa.database-platform: org.hibernate.dialect.H2Dialect

src/main/java/io/wkrzywiec/hexagonal/library/BorrowingDomainConfig.java

@@ -0,0 +1,29 @@
+package io.wkrzywiec.hexagonal.library;
+
+import io.wkrzywiec.hexagonal.library.borrowing.BorrowingFacade;
+import io.wkrzywiec.hexagonal.library.borrowing.infrastructure.BorrowingDatabaseAdapter;
+import io.wkrzywiec.hexagonal.library.borrowing.infrastructure.SpringBorrowingEventPublisherAdapter;
+import io.wkrzywiec.hexagonal.library.borrowing.ports.incoming.MakeBookAvailable;
+import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingDatabase;
+import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingEventPublisher;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.context.annotation.Bean;
+import org.springframework.jdbc.core.JdbcTemplate;
+
+public class BorrowingDomainConfig {
+
+    @Bean
+    public BorrowingDatabase borrowingDatabase(JdbcTemplate jdbcTemplate) {
+        return new BorrowingDatabaseAdapter(jdbcTemplate);
+    }
+
+    @Bean
+    public BorrowingEventPublisher borrowingEventPublisher(ApplicationEventPublisher applicationEventPublisher){
+        return new SpringBorrowingEventPublisherAdapter(applicationEventPublisher);
+    }
+
+    @Bean
+    public MakeBookAvailable makeBookAvailable(BorrowingDatabase database, BorrowingEventPublisher borrowingEventPublisher) {
+        return new BorrowingFacade(database, borrowingEventPublisher);
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/EmailDomainConfig.java

@@ -0,0 +1,28 @@
+package io.wkrzywiec.hexagonal.library;
+
+import io.wkrzywiec.hexagonal.library.email.EmailFacade;
+import io.wkrzywiec.hexagonal.library.email.infrastructure.EmailDatabaseAdapter;
+import io.wkrzywiec.hexagonal.library.email.infrastructure.SendGridEmailSender;
+import io.wkrzywiec.hexagonal.library.email.ports.incoming.SendReservationConfirmation;
+import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailSender;
+import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailDatabase;
+import org.springframework.context.annotation.Bean;
+import org.springframework.jdbc.core.JdbcTemplate;
+
+public class EmailDomainConfig {
+
+    @Bean
+    public EmailSender emailSender() {
+        return new SendGridEmailSender();
+    }
+
+    @Bean
+    public EmailDatabase libraryDatabase(JdbcTemplate jdbcTemplate){
+        return new EmailDatabaseAdapter(jdbcTemplate);
+    }
+
+    @Bean
+    public SendReservationConfirmation sendReservationConfirmation(EmailSender emailSender, EmailDatabase database){
+        return new EmailFacade(emailSender, database);
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/InventoryDomainConfig.java

@@ -0,0 +1,27 @@
+package io.wkrzywiec.hexagonal.library;
+
+import io.wkrzywiec.hexagonal.library.inventory.InventoryFacade;
+import io.wkrzywiec.hexagonal.library.inventory.infrastructure.BookRepository;
+import io.wkrzywiec.hexagonal.library.inventory.infrastructure.GoogleBooksAdapter;
+import io.wkrzywiec.hexagonal.library.inventory.infrastructure.InventoryDatabaseAdapter;
+import io.wkrzywiec.hexagonal.library.inventory.infrastructure.SpringInventoryEventPublisherAdapter;
+import io.wkrzywiec.hexagonal.library.inventory.ports.incoming.AddNewBook;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.context.annotation.Bean;
+import org.springframework.web.client.RestTemplate;
+
+class InventoryDomainConfig {
+
+    @Bean
+    SpringInventoryEventPublisherAdapter springInventoryEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
+        return new SpringInventoryEventPublisherAdapter(applicationEventPublisher);
+    }
+
+    @Bean
+    AddNewBook addNewBook(BookRepository repository, RestTemplate restTemplate, ApplicationEventPublisher applicationEventPublisher){
+        return new InventoryFacade(
+                new InventoryDatabaseAdapter(repository),
+                new GoogleBooksAdapter(restTemplate),
+                springInventoryEventPublisher(applicationEventPublisher));
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/LibraryHexagonalApplication.java

@@ -2,8 +2,15 @@ package io.wkrzywiec.hexagonal.library;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Import;
 
 @SpringBootApplication
+@Import({
+		LibraryHexagonalConfig.class,
+		InventoryDomainConfig.class,
+		BorrowingDomainConfig.class,
+		EmailDomainConfig.class
+})
 public class LibraryHexagonalApplication {
 
 	public static void main(String[] args) {

src/main/java/io/wkrzywiec/hexagonal/library/LibraryHexagonalConfig.java

@@ -0,0 +1,12 @@
+package io.wkrzywiec.hexagonal.library;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.web.client.RestTemplate;
+
+public class LibraryHexagonalConfig {
+
+    @Bean
+    RestTemplate restTemplate(){
+        return new RestTemplate();
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/BorrowingFacade.java

@@ -1,6 +1,7 @@
 package io.wkrzywiec.hexagonal.library.borrowing;
 
 import io.wkrzywiec.hexagonal.library.borrowing.model.ActiveUser;
+import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservedEvent;
 import io.wkrzywiec.hexagonal.library.borrowing.model.MakeBookAvailableCommand;
 import io.wkrzywiec.hexagonal.library.borrowing.model.ReservationDetails;
 import io.wkrzywiec.hexagonal.library.borrowing.model.exception.ActiveUserNotFoundException;
@@ -11,13 +12,16 @@ import io.wkrzywiec.hexagonal.library.borrowing.model.ReservedBook;
 import io.wkrzywiec.hexagonal.library.borrowing.ports.incoming.MakeBookAvailable;
 import io.wkrzywiec.hexagonal.library.borrowing.ports.incoming.ReserveBook;
 import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingDatabase;
+import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingEventPublisher;
 
 public class BorrowingFacade implements MakeBookAvailable, ReserveBook {
 
-    private BorrowingDatabase database;
+    private final BorrowingDatabase database;
+    private final BorrowingEventPublisher eventPublisher;
 
-    public BorrowingFacade(BorrowingDatabase database) {
+    public BorrowingFacade(BorrowingDatabase database, BorrowingEventPublisher eventPublisher) {
         this.database = database;
+        this.eventPublisher = eventPublisher;
     }
 
     @Override
@@ -37,6 +41,7 @@ public class BorrowingFacade implements MakeBookAvailable, ReserveBook {
 
         ReservedBook reservedBook = activeUser.reserve(availableBook);
         ReservationDetails reservationDetails = database.save(reservedBook);
+        eventPublisher.publish(new BookReservedEvent(reservationDetails));
         return reservationDetails.getReservationId().getIdAsLong();
     }
 }

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/application/BorrowingController.java

@@ -1,4 +0,0 @@
-package io.wkrzywiec.hexagonal.library.borrowing.application;
-
-public class BorrowingController {
-}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/application/NewBookWasAddedEventHandler.java

@@ -0,0 +1,20 @@
+package io.wkrzywiec.hexagonal.library.borrowing.application;
+
+import io.wkrzywiec.hexagonal.library.borrowing.model.MakeBookAvailableCommand;
+import io.wkrzywiec.hexagonal.library.borrowing.ports.incoming.MakeBookAvailable;
+import io.wkrzywiec.hexagonal.library.inventory.model.NewBookWasAddedEvent;
+import lombok.RequiredArgsConstructor;
+import org.springframework.context.event.EventListener;
+import org.springframework.stereotype.Component;
+
+@RequiredArgsConstructor
+@Component
+public class NewBookWasAddedEventHandler {
+
+    private final MakeBookAvailable makeBookAvailable;
+
+    @EventListener
+    public void handle(NewBookWasAddedEvent event){
+        makeBookAvailable.handle(new MakeBookAvailableCommand(event.getBookIdAsLong()));
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/application/ReservationController.java

@@ -0,0 +1,25 @@
+package io.wkrzywiec.hexagonal.library.borrowing.application;
+
+import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservationCommand;
+import io.wkrzywiec.hexagonal.library.borrowing.ports.incoming.ReserveBook;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/reservations")
+@RequiredArgsConstructor
+public class ReservationController {
+
+    private final ReserveBook reserveBook;
+
+    @PostMapping("")
+    public ResponseEntity<String> makeReservation(@RequestBody BookReservationCommand reservationCommand){
+        Long reservationId = reserveBook.handle(reservationCommand);
+        return new ResponseEntity<>("Reservation has been made with an id " + reservationId, HttpStatus.CREATED);
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/infrastructure/BorrowingDatabaseAdapter.java

@@ -6,7 +6,7 @@ import io.wkrzywiec.hexagonal.library.borrowing.model.ReservationDetails;
 import io.wkrzywiec.hexagonal.library.borrowing.model.ReservationId;
 import io.wkrzywiec.hexagonal.library.borrowing.model.ReservedBook;
 import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingDatabase;
-import lombok.AllArgsConstructor;
+import lombok.RequiredArgsConstructor;
 import org.springframework.dao.DataAccessException;
 import org.springframework.jdbc.core.JdbcTemplate;
 
@@ -14,10 +14,10 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 
-@AllArgsConstructor
-class BorrowingDatabaseAdapter implements BorrowingDatabase {
+@RequiredArgsConstructor
+public class BorrowingDatabaseAdapter implements BorrowingDatabase {
 
-    private JdbcTemplate jdbcTemplate;
+    private final JdbcTemplate jdbcTemplate;
 
     @Override
     public void setBookAvailable(Long bookId) {

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/infrastructure/SpringBorrowingEventPublisherAdapter.java

@@ -0,0 +1,19 @@
+package io.wkrzywiec.hexagonal.library.borrowing.infrastructure;
+
+import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservedEvent;
+import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingEventPublisher;
+import lombok.RequiredArgsConstructor;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class SpringBorrowingEventPublisherAdapter implements BorrowingEventPublisher {
+
+    private final ApplicationEventPublisher eventPublisher;
+
+    @Override
+    public void publish(BookReservedEvent event) {
+        eventPublisher.publishEvent(event);
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/model/BookReservedEvent.java

@@ -0,0 +1,35 @@
+package io.wkrzywiec.hexagonal.library.borrowing.model;
+
+import java.time.Instant;
+
+public class BookReservedEvent {
+
+    private final ReservationId reservationId;
+    private final Long userId;
+    private final ReservedBook reservedBook;
+    private final Instant timestamp;
+
+    public BookReservedEvent(ReservationDetails reservationDetails) {
+        this.reservationId = reservationDetails.getReservationId();
+        this.userId = reservationDetails.getReservedBook().getAssignedUserIdAsLong();
+        this.reservedBook = reservationDetails.getReservedBook();
+        timestamp = Instant.now();
+    }
+
+    public Long getReservationIdAsLong() {
+        return reservationId.getIdAsLong();
+    }
+
+    public Long getUserIdAsLong() {
+        return userId;
+    }
+
+    public Long getBookIdAsLong() {
+        return reservedBook.getIdAsLong();
+    }
+
+    public String getEventTimeStampAsString() {
+        return timestamp.toString();
+    }
+
+}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/ports/outgoing/BorrowingEventPublisher.java

@@ -0,0 +1,7 @@
+package io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing;
+
+import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservedEvent;
+
+public interface BorrowingEventPublisher {
+    public void publish(BookReservedEvent event);
+}

src/main/java/io/wkrzywiec/hexagonal/library/email/EmailContent.java

@@ -1,4 +0,0 @@
-package io.wkrzywiec.hexagonal.library.email;
-
-public class EmailContent {
-}

src/main/java/io/wkrzywiec/hexagonal/library/email/EmailCreator.java

@@ -1,10 +1,18 @@
 package io.wkrzywiec.hexagonal.library.email;
 
+import io.wkrzywiec.hexagonal.library.email.model.EmailAddress;
+import io.wkrzywiec.hexagonal.library.email.model.ReservationConfirmEmail;
+
 class EmailCreator {
 
-//    EmailContent prepareEmailContent() {
-//        // email to
-//        // email from
-//        //
-//    }
+    static ReservationConfirmEmail reservationEmail(Long reservationId, String bookTitle, String emailTo){
+
+        EmailAddress from = new EmailAddress("tom@library.com");
+        EmailAddress to = new EmailAddress(emailTo);
+
+        String subject = String.format("Library - book reservation confirmation (id - %d)", reservationId);
+        String content = String.format("Dear reader,%n you have reserved a %s book which will be waiting for you in our library for next 2 days. Your reservation id is %d. %n Have a nice day, %n Library",
+                bookTitle, reservationId);
+        return new ReservationConfirmEmail(from, to, subject, content);
+    }
 }

src/main/java/io/wkrzywiec/hexagonal/library/email/EmailFacade.java

@@ -0,0 +1,32 @@
+package io.wkrzywiec.hexagonal.library.email;
+
+import io.wkrzywiec.hexagonal.library.email.model.ReservationConfirmEmail;
+import io.wkrzywiec.hexagonal.library.email.model.SendReservationConfirmationCommand;
+import io.wkrzywiec.hexagonal.library.email.ports.incoming.SendReservationConfirmation;
+import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailSender;
+import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailDatabase;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public class EmailFacade implements SendReservationConfirmation {
+
+    private final EmailSender emailSender;
+    private final EmailDatabase database;
+
+    @Override
+    public void handle(SendReservationConfirmationCommand sendReservationConfirmation) {
+        String bookTitle = database
+                .getTitleByBookId(sendReservationConfirmation.getBookId())
+                .orElseThrow(() -> new IllegalArgumentException("Can't get book title from database. Reason: there is no book with an id: " + sendReservationConfirmation.getBookId()));
+        String userEmailAddress = database
+                .getUserEmailAddress(sendReservationConfirmation.getUserId())
+                .orElseThrow(() -> new IllegalArgumentException("Can't get email address from database. Reason: there is no user with an id: " + sendReservationConfirmation.getUserId()));
+
+        ReservationConfirmEmail reservationConfirmEmail = EmailCreator.reservationEmail(
+                sendReservationConfirmation.getReservationId(),
+                bookTitle,
+                userEmailAddress
+        );
+        emailSender.sendReservationConfirmationEmail(reservationConfirmEmail);
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/email/EmailSender.java

@@ -1,6 +0,0 @@
-package io.wkrzywiec.hexagonal.library.email;
-
-
-public interface EmailSender {
-//    void sendReservationConfirmationEmail(ReservationDetails reservationDetails);
-}

src/main/java/io/wkrzywiec/hexagonal/library/email/SendGridEmailSender.java

@@ -1,33 +0,0 @@
-package io.wkrzywiec.hexagonal.library.email;
-
-//import io.wkrzywiec.hexagonal.library.borrowing.model.ReservationDetails;
-
-public class SendGridEmailSender implements EmailSender {
-
-//    @Override
-//    public void sendReservationConfirmationEmail(ReservationDetails reservationDetails) {
-        // email address - to
-        // repl9oservation id
-        // book title`
-
-//        Email from = new Email("test@example.com");
-//        String subject = "Sending with SendGrid is Fun";
-//        Email to = new Email("test@example.com");
-//        Content content = new Content("text/plain", "and easy to do anywhere, even with Java");
-//        Mail mail = new Mail(from, subject, to, content);
-//
-//        SendGrid sg = new SendGrid(System.getenv("SENDGRID_API_KEY"));
-//        Request request = new Request();
-//        try {
-//            request.setMethod(Method.POST);
-//            request.setEndpoint("mail/send");
-//            request.setBody(mail.build());
-//            Response response = sg.api(request);
-//            System.out.println(response.getStatusCode());
-//            System.out.println(response.getBody());
-//            System.out.println(response.getHeaders());
-//        } catch (IOException ex) {
-//
-//        }
-//    }
-}

src/main/java/io/wkrzywiec/hexagonal/library/email/application/BookReservedEventHandler.java

@@ -0,0 +1,24 @@
+package io.wkrzywiec.hexagonal.library.email.application;
+
+import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservedEvent;
+import io.wkrzywiec.hexagonal.library.email.model.SendReservationConfirmationCommand;
+import io.wkrzywiec.hexagonal.library.email.ports.incoming.SendReservationConfirmation;
+import lombok.RequiredArgsConstructor;
+import org.springframework.context.event.EventListener;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class BookReservedEventHandler {
+
+    private final SendReservationConfirmation sendReservationConfirmation;
+
+    @EventListener
+    public void handle(BookReservedEvent event) {
+        sendReservationConfirmation.handle(
+                new SendReservationConfirmationCommand(
+                        event.getReservationIdAsLong(),
+                        event.getUserIdAsLong(),
+                        event.getBookIdAsLong()));
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/email/infrastructure/EmailDatabaseAdapter.java

@@ -0,0 +1,38 @@
+package io.wkrzywiec.hexagonal.library.email.infrastructure;
+
+import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailDatabase;
+import lombok.RequiredArgsConstructor;
+import org.springframework.dao.DataAccessException;
+import org.springframework.jdbc.core.JdbcTemplate;
+
+import java.util.Optional;
+
+@RequiredArgsConstructor
+public class EmailDatabaseAdapter implements EmailDatabase {
+
+    private final JdbcTemplate jdbcTemplate;
+
+    @Override
+    public Optional<String> getTitleByBookId(Long bookId) {
+        try {
+            return Optional.ofNullable(jdbcTemplate.queryForObject(
+                    "SELECT title FROM book WHERE id = ?",
+                    String.class,
+                    bookId));
+        } catch (DataAccessException ex){
+            return Optional.empty();
+        }
+    }
+
+    @Override
+    public Optional<String> getUserEmailAddress(Long userId) {
+        try {
+            return Optional.ofNullable(jdbcTemplate.queryForObject(
+                    "SELECT email FROM user WHERE id = ?",
+                    String.class,
+                    userId));
+        } catch (DataAccessException ex){
+            return Optional.empty();
+        }
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/email/infrastructure/SendGridEmailSender.java

@@ -0,0 +1,38 @@
+package io.wkrzywiec.hexagonal.library.email.infrastructure;
+
+import com.sendgrid.Method;
+import com.sendgrid.Request;
+import com.sendgrid.SendGrid;
+import com.sendgrid.helpers.mail.Mail;
+import com.sendgrid.helpers.mail.objects.Content;
+import com.sendgrid.helpers.mail.objects.Email;
+import io.wkrzywiec.hexagonal.library.email.model.ReservationConfirmEmail;
+import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailSender;
+
+import java.io.IOException;
+
+public class SendGridEmailSender implements EmailSender {
+
+    @Override
+    public void sendReservationConfirmationEmail(ReservationConfirmEmail reservationConfirmEmail) {
+        Email from = new Email(reservationConfirmEmail.getFromEmailAddressAsString());
+        Email to = new Email(reservationConfirmEmail.getToEmailAddressAsString());
+        Content content = new Content("text/plain", reservationConfirmEmail.getContentAsString());
+        Mail mail = new Mail(
+                from,
+                reservationConfirmEmail.getSubjectAsString(),
+                to,
+                content);
+
+        SendGrid sg = new SendGrid(System.getenv("SENDGRID_API_KEY"));
+        Request request = new Request();
+        try {
+            request.setMethod(Method.POST);
+            request.setEndpoint("mail/send");
+            request.setBody(mail.build());
+            sg.api(request);
+        } catch (IOException ex) {
+            System.out.print(ex);
+        }
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/email/model/EmailAddress.java

@@ -0,0 +1,24 @@
+package io.wkrzywiec.hexagonal.library.email.model;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class EmailAddress {
+
+    private final String value;
+
+    public EmailAddress(String value) {
+        Pattern pattern = Pattern.compile("^(.+)@(.+)$");
+        Matcher matcher = pattern.matcher(value);
+        if(matcher.matches()){
+            this.value = value;
+        } else {
+            throw new IllegalArgumentException("Provided value is not an email address");
+        }
+
+    }
+
+    public String getAsString() {
+        return value;
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/email/model/ReservationConfirmEmail.java

@@ -0,0 +1,28 @@
+package io.wkrzywiec.hexagonal.library.email.model;
+
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public class ReservationConfirmEmail {
+
+    private final EmailAddress from;
+    private final EmailAddress to;
+    private final String subject;
+    private final String content;
+
+    public String getFromEmailAddressAsString(){
+        return this.from.getAsString();
+    }
+
+    public String getToEmailAddressAsString(){
+        return this.to.getAsString();
+    }
+
+    public String getSubjectAsString(){
+        return this.subject;
+    }
+
+    public String getContentAsString(){
+        return this.content;
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/email/model/SendReservationConfirmationCommand.java

@@ -0,0 +1,17 @@
+package io.wkrzywiec.hexagonal.library.email.model;
+
+import lombok.Getter;
+
+@Getter
+public class SendReservationConfirmationCommand {
+
+    private final Long reservationId;
+    private final Long userId;
+    private final Long bookId;
+
+    public SendReservationConfirmationCommand(Long reservationId, Long userId, Long bookId) {
+        this.reservationId = reservationId;
+        this.userId = userId;
+        this.bookId = bookId;
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/email/ports/incoming/SendReservationConfirmation.java

@@ -0,0 +1,7 @@
+package io.wkrzywiec.hexagonal.library.email.ports.incoming;
+
+import io.wkrzywiec.hexagonal.library.email.model.SendReservationConfirmationCommand;
+
+public interface SendReservationConfirmation {
+    void handle(SendReservationConfirmationCommand reservationConfirmationCommand);
+}

src/main/java/io/wkrzywiec/hexagonal/library/email/ports/outgoing/EmailDatabase.java

@@ -0,0 +1,8 @@
+package io.wkrzywiec.hexagonal.library.email.ports.outgoing;
+
+import java.util.Optional;
+
+public interface EmailDatabase {
+    Optional<String> getTitleByBookId(Long bookId);
+    Optional<String> getUserEmailAddress(Long userId);
+}

src/main/java/io/wkrzywiec/hexagonal/library/email/ports/outgoing/EmailSender.java

@@ -0,0 +1,8 @@
+package io.wkrzywiec.hexagonal.library.email.ports.outgoing;
+
+
+import io.wkrzywiec.hexagonal.library.email.model.ReservationConfirmEmail;
+
+public interface EmailSender {
+    void sendReservationConfirmationEmail(ReservationConfirmEmail reservationConfirmEmail);
+}

src/main/java/io/wkrzywiec/hexagonal/library/inventory/InventoryFacade.java

@@ -2,23 +2,29 @@ package io.wkrzywiec.hexagonal.library.inventory;
 
 import io.wkrzywiec.hexagonal.library.inventory.model.AddNewBookCommand;
 import io.wkrzywiec.hexagonal.library.inventory.model.Book;
+import io.wkrzywiec.hexagonal.library.inventory.model.NewBookWasAddedEvent;
 import io.wkrzywiec.hexagonal.library.inventory.ports.incoming.AddNewBook;
+import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.InventoryEventPublisher;
 import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.GetBookDetails;
 import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.InventoryDatabase;
 
+
 public class InventoryFacade implements AddNewBook{
 
     private InventoryDatabase database;
     private GetBookDetails getBookDetails;
+    private InventoryEventPublisher eventPublisher;
 
-    public InventoryFacade(InventoryDatabase database, GetBookDetails getBookDetails) {
+    public InventoryFacade(InventoryDatabase database, GetBookDetails getBookDetails, InventoryEventPublisher eventPublisher) {
         this.database = database;
         this.getBookDetails = getBookDetails;
+        this.eventPublisher = eventPublisher;
     }
 
     @Override
     public void handle(AddNewBookCommand addNewBookCommand){
         Book book = getBookDetails.handle(addNewBookCommand.getGoogleBookId());
-        database.save(book);
+        Book savedBook = database.save(book);
+        eventPublisher.publishNewBookWasAddedEvent(new NewBookWasAddedEvent(savedBook.getIdAsLong()));
     }
 }

src/main/java/io/wkrzywiec/hexagonal/library/inventory/infrastructure/BookRepository.java

@@ -5,5 +5,5 @@ import org.springframework.data.repository.CrudRepository;
 import org.springframework.stereotype.Repository;
 
 @Repository
-interface BookRepository extends CrudRepository<Book, Long> {
+public interface BookRepository extends CrudRepository<Book, Long> {
 }

src/main/java/io/wkrzywiec/hexagonal/library/inventory/infrastructure/GoogleBooksAdapter.java

@@ -24,7 +24,7 @@ import java.util.stream.StreamSupport;
 import static java.util.Optional.ofNullable;
 
 @RequiredArgsConstructor
-class GoogleBooksAdapter implements GetBookDetails {
+public class GoogleBooksAdapter implements GetBookDetails {
 
     private final RestTemplate restTemplate;
 

src/main/java/io/wkrzywiec/hexagonal/library/inventory/infrastructure/InventoryDatabaseAdapter.java

@@ -5,12 +5,12 @@ import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.InventoryDatabase
 import lombok.RequiredArgsConstructor;
 
 @RequiredArgsConstructor
-class InventoryDatabaseAdapter implements InventoryDatabase {
+public class InventoryDatabaseAdapter implements InventoryDatabase {
 
     private final BookRepository repository;
 
     @Override
-    public void save(Book book) {
-        repository.save(book);
+    public Book save(Book book) {
+        return repository.save(book);
     }
 }

src/main/java/io/wkrzywiec/hexagonal/library/inventory/infrastructure/InventoryDomainConfig.java

@@ -1,23 +0,0 @@
-package io.wkrzywiec.hexagonal.library.inventory.infrastructure;
-
-import io.wkrzywiec.hexagonal.library.inventory.InventoryFacade;
-import io.wkrzywiec.hexagonal.library.inventory.ports.incoming.AddNewBook;
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Configuration;
-import org.springframework.web.client.RestTemplate;
-
-@Configuration
-class InventoryDomainConfig {
-
-    @Bean
-    RestTemplate restTemplate(){
-        return new RestTemplate();
-    }
-
-    @Bean
-    AddNewBook addNewBook(BookRepository repository, RestTemplate restTemplate){
-        return new InventoryFacade(
-                new InventoryDatabaseAdapter(repository),
-                new GoogleBooksAdapter(restTemplate));
-    }
-}

src/main/java/io/wkrzywiec/hexagonal/library/inventory/infrastructure/SpringInventoryEventPublisherAdapter.java

@@ -0,0 +1,17 @@
+package io.wkrzywiec.hexagonal.library.inventory.infrastructure;
+
+import io.wkrzywiec.hexagonal.library.inventory.model.NewBookWasAddedEvent;
+import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.InventoryEventPublisher;
+import lombok.RequiredArgsConstructor;
+import org.springframework.context.ApplicationEventPublisher;
+
+@RequiredArgsConstructor
+public class SpringInventoryEventPublisherAdapter implements InventoryEventPublisher {
+
+    private final ApplicationEventPublisher applicationEventPublisher;
+
+    @Override
+    public void publishNewBookWasAddedEvent(NewBookWasAddedEvent event) {
+        applicationEventPublisher.publishEvent(event);
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/inventory/model/Book.java

@@ -67,6 +67,10 @@ public class Book {
         this.imageLink = imageLink;
     }
 
+    public Long getIdAsLong(){
+        return id;
+    }
+
     private Book() {
     }
 }

src/main/java/io/wkrzywiec/hexagonal/library/inventory/model/NewBookWasAddedEvent.java

@@ -0,0 +1,22 @@
+package io.wkrzywiec.hexagonal.library.inventory.model;
+
+import java.time.Instant;
+
+public class NewBookWasAddedEvent {
+
+    private final Long bookId;
+    private final Instant timestamp;
+
+    public NewBookWasAddedEvent(Long bookId) {
+        this.bookId = bookId;
+        timestamp = Instant.now();
+    }
+
+    public Long getBookIdAsLong() {
+        return bookId;
+    }
+
+    public String getEventTimeStampAsString() {
+        return timestamp.toString();
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/inventory/ports/outgoing/InventoryDatabase.java

@@ -3,5 +3,5 @@ package io.wkrzywiec.hexagonal.library.inventory.ports.outgoing;
 import io.wkrzywiec.hexagonal.library.inventory.model.Book;
 
 public interface InventoryDatabase {
-    void save(Book book);
+    Book save(Book book);
 }

src/main/java/io/wkrzywiec/hexagonal/library/inventory/ports/outgoing/InventoryEventPublisher.java

@@ -0,0 +1,7 @@
+package io.wkrzywiec.hexagonal.library.inventory.ports.outgoing;
+
+import io.wkrzywiec.hexagonal.library.inventory.model.NewBookWasAddedEvent;
+
+public interface InventoryEventPublisher {
+    void publishNewBookWasAddedEvent(NewBookWasAddedEvent event);
+}

src/test/java/io/wkrzywiec/hexagonal/library/architecture/BorrowingArchitectureTest.java

@@ -5,22 +5,13 @@ import com.tngtech.archunit.junit.AnalyzeClasses;
 import com.tngtech.archunit.junit.ArchTest;
 import com.tngtech.archunit.lang.ArchRule;
 import io.wkrzywiec.hexagonal.library.borrowing.BorrowingFacade;
-import io.wkrzywiec.hexagonal.library.inventory.InventoryFacade;
 
 import static com.tngtech.archunit.lang.syntax.ArchRuleDefinition.noClass;
 import static com.tngtech.archunit.library.Architectures.onionArchitecture;
 
-@AnalyzeClasses(packages = {"io.wkrzywiec.hexagonal.library.inventory",
-                            "io.wkrzywiec.hexagonal.library.borrowing"},
+@AnalyzeClasses(packages = {"io.wkrzywiec.hexagonal.library.borrowing"},
                 importOptions = { ImportOption.DoNotIncludeTests.class })
-public class HexagonalArchitectureTest {
-
-    @ArchTest
-    public static final ArchRule hexagonalArchInInventoryDomain = onionArchitecture()
-            .domainModels("io.wkrzywiec.hexagonal.library.inventory.model..")
-            .domainServices("io.wkrzywiec.hexagonal.library.inventory..")
-            .applicationServices("io.wkrzywiec.hexagonal.library.inventory.application..")
-            .adapter("infrastructure", "io.wkrzywiec.hexagonal.library.inventory.infrastructure..");
+public class BorrowingArchitectureTest {
 
     @ArchTest
     public static final ArchRule hexagonalArchInBorrowingDomain = onionArchitecture()
@@ -29,13 +20,6 @@ public class HexagonalArchitectureTest {
             .applicationServices("io.wkrzywiec.hexagonal.library.borrowing.application..")
             .adapter("infrastructure", "io.wkrzywiec.hexagonal.library.borrowing.infrastructure..");
 
-    @ArchTest
-    public static final ArchRule noSpringDependenciesInInventoryFacade =
-            noClass(InventoryFacade.class)
-                    .should()
-                    .dependOnClassesThat()
-                    .resideInAPackage("org.springframework..");
-
     @ArchTest
     public static final ArchRule noSpringDependenciesInBorrowingFacade =
             noClass(BorrowingFacade.class)

src/test/java/io/wkrzywiec/hexagonal/library/architecture/EmailArchitectureTest.java

@@ -0,0 +1,29 @@
+package io.wkrzywiec.hexagonal.library.architecture;
+
+import com.tngtech.archunit.core.importer.ImportOption;
+import com.tngtech.archunit.junit.AnalyzeClasses;
+import com.tngtech.archunit.junit.ArchTest;
+import com.tngtech.archunit.lang.ArchRule;
+import io.wkrzywiec.hexagonal.library.email.EmailFacade;
+
+import static com.tngtech.archunit.lang.syntax.ArchRuleDefinition.noClass;
+import static com.tngtech.archunit.library.Architectures.onionArchitecture;
+
+@AnalyzeClasses(packages = {"io.wkrzywiec.hexagonal.library.email"},
+        importOptions = { ImportOption.DoNotIncludeTests.class })
+public class EmailArchitectureTest {
+
+    @ArchTest
+    public static final ArchRule hexagonalArchInEmailDomain = onionArchitecture()
+            .domainModels("io.wkrzywiec.hexagonal.library.email.model..")
+            .domainServices("io.wkrzywiec.hexagonal.library.email..")
+            .applicationServices("io.wkrzywiec.hexagonal.library.email.application..")
+            .adapter("infrastructure", "io.wkrzywiec.hexagonal.library.email.infrastructure..");
+
+    @ArchTest
+    public static final ArchRule noSpringDependenciesInEmailFacade =
+            noClass(EmailFacade.class)
+                    .should()
+                    .dependOnClassesThat()
+                    .resideInAPackage("org.springframework..");
+}

src/test/java/io/wkrzywiec/hexagonal/library/architecture/InventoryArchitectureTest.java

@@ -0,0 +1,30 @@
+package io.wkrzywiec.hexagonal.library.architecture;
+
+import com.tngtech.archunit.core.importer.ImportOption;
+import com.tngtech.archunit.junit.AnalyzeClasses;
+import com.tngtech.archunit.junit.ArchTest;
+import com.tngtech.archunit.lang.ArchRule;
+import io.wkrzywiec.hexagonal.library.inventory.InventoryFacade;
+
+import static com.tngtech.archunit.lang.syntax.ArchRuleDefinition.noClass;
+import static com.tngtech.archunit.library.Architectures.onionArchitecture;
+
+@AnalyzeClasses(packages = {"io.wkrzywiec.hexagonal.library.inventory"},
+        importOptions = { ImportOption.DoNotIncludeTests.class })
+public class InventoryArchitectureTest {
+
+    @ArchTest
+    public static final ArchRule hexagonalArchInInventoryDomain = onionArchitecture()
+            .domainModels("io.wkrzywiec.hexagonal.library.inventory.model..")
+            .domainServices("io.wkrzywiec.hexagonal.library.inventory..")
+            .applicationServices("io.wkrzywiec.hexagonal.library.inventory.application..")
+            .adapter("infrastructure", "io.wkrzywiec.hexagonal.library.inventory.infrastructure..");
+
+    @ArchTest
+    public static final ArchRule noSpringDependenciesInInventoryFacade =
+            noClass(InventoryFacade.class)
+                    .should()
+                    .dependOnClassesThat()
+                    .resideInAPackage("org.springframework..");
+
+}

src/test/java/io/wkrzywiec/hexagonal/library/borrowing/BorrowingEventPublisherFake.java

@@ -0,0 +1,12 @@
+package io.wkrzywiec.hexagonal.library.borrowing;
+
+import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservedEvent;
+import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingEventPublisher;
+
+public class BorrowingEventPublisherFake implements BorrowingEventPublisher {
+
+    @Override
+    public void publish(BookReservedEvent event) {
+
+    }
+}

src/test/java/io/wkrzywiec/hexagonal/library/borrowing/BorrowingFacadeTest.java

@@ -7,6 +7,7 @@ import io.wkrzywiec.hexagonal.library.borrowing.model.MakeBookAvailableCommand;
 import io.wkrzywiec.hexagonal.library.borrowing.model.exception.ActiveUserNotFoundException;
 import io.wkrzywiec.hexagonal.library.borrowing.model.exception.AvailableBookNotFoundExeption;
 import io.wkrzywiec.hexagonal.library.borrowing.model.exception.TooManyBooksAssignedToUserException;
+import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingEventPublisher;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
@@ -19,11 +20,13 @@ public class BorrowingFacadeTest {
 
     private BorrowingFacade facade;
     private InMemoryBorrowingDatabase database;
+    private BorrowingEventPublisher eventPublisher;
 
     @BeforeEach
     public void init(){
         database = new InMemoryBorrowingDatabase();
-        facade = new BorrowingFacade(database);
+        eventPublisher = new BorrowingEventPublisherFake();
+        facade = new BorrowingFacade(database, eventPublisher);
     }
 
     @Test

src/test/java/io/wkrzywiec/hexagonal/library/borrowing/infrastructure/BorrowingDatabaseAdapterITCase.java

@@ -9,15 +9,17 @@ import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.test.autoconfigure.jdbc.JdbcTest;
+import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.test.context.jdbc.Sql;
 
 import java.util.Optional;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.springframework.test.context.jdbc.Sql.ExecutionPhase.AFTER_TEST_METHOD;
 
-@JdbcTest
+@SpringBootTest
 public class BorrowingDatabaseAdapterITCase {
 
     @Autowired
@@ -28,21 +30,12 @@ public class BorrowingDatabaseAdapterITCase {
     @BeforeEach
     public void init(){
         database = new BorrowingDatabaseAdapter(jdbcTemplate);
-
-        jdbcTemplate.update(
-                "INSERT INTO book (book_external_id, title) VALUES (?, ?)",
-                TestData.homoDeusBookGoogleId(),
-                TestData.homoDeusBookTitle());
-
-        jdbcTemplate.update(
-                "INSERT INTO user (first_name, last_name, email) VALUES (?, ?, ?)",
-                "John",
-                "Doe",
-                "john.doe@test.com");
     }
 
     @Test
     @DisplayName("Save book as available")
+    @Sql("/book-and-user.sql")
+    @Sql(scripts = "/clean-database.sql", executionPhase = AFTER_TEST_METHOD)
     public void shouldSaveAvailableBook(){
         //given
         Long bookId = jdbcTemplate.queryForObject(
@@ -63,6 +56,8 @@ public class BorrowingDatabaseAdapterITCase {
 
     @Test
     @DisplayName("Get available book by id")
+    @Sql({"/book-and-user.sql", "/available-book.sql"})
+    @Sql(scripts = "/clean-database.sql", executionPhase = AFTER_TEST_METHOD)
     public void shouldGetAvailableBook(){
         //given
         Long bookId = jdbcTemplate.queryForObject(
@@ -70,10 +65,6 @@ public class BorrowingDatabaseAdapterITCase {
                 Long.class,
                 TestData.homoDeusBookTitle());
 
-        jdbcTemplate.update(
-                "INSERT INTO available (book_id) VALUES (?)",
-                bookId);
-
         //when
         Optional<AvailableBook> availableBookOptional = database.getAvailableBook(bookId);
 
@@ -84,6 +75,8 @@ public class BorrowingDatabaseAdapterITCase {
 
     @Test
     @DisplayName("Get active user by id")
+    @Sql("/book-and-user.sql")
+    @Sql(scripts = "/clean-database.sql", executionPhase = AFTER_TEST_METHOD)
     public void shouldGetActiveUser() {
         //given
         Long activeUserId = jdbcTemplate.queryForObject(
@@ -101,6 +94,8 @@ public class BorrowingDatabaseAdapterITCase {
 
     @Test
     @DisplayName("Save reserved book")
+    @Sql({"/book-and-user.sql", "/available-book.sql"})
+    @Sql(scripts = "/clean-database.sql", executionPhase = AFTER_TEST_METHOD)
     public void shouldSaveReservedBook(){
         //given
         Long bookId = jdbcTemplate.queryForObject(
@@ -119,7 +114,6 @@ public class BorrowingDatabaseAdapterITCase {
         ReservationDetails reservationDetails = database.save(reservedBook);
 
         //then
-
         assertEquals(bookId, reservationDetails.getReservedBook().getIdAsLong());
         assertEquals(activeUserId, reservationDetails.getReservedBook().getAssignedUserIdAsLong());
         assertTrue(reservationDetails.getReservationId().getIdAsLong() > 0);

src/test/java/io/wkrzywiec/hexagonal/library/email/EmailFacadeTest.java

@@ -0,0 +1,39 @@
+package io.wkrzywiec.hexagonal.library.email;
+
+import io.wkrzywiec.hexagonal.library.TestData;
+import io.wkrzywiec.hexagonal.library.email.model.SendReservationConfirmationCommand;
+import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailSender;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
+public class EmailFacadeTest {
+
+    private EmailFacade facade;
+    private EmailSender emailSender;
+    private InMemoryEmailDatabase database;
+
+
+    @BeforeEach
+    public void init() {
+        database = new InMemoryEmailDatabase();
+        emailSender = new EmailSenderFake();
+        facade = new EmailFacade(emailSender, database);
+
+        database.bookTitles.put(1L, TestData.homoDeusBookTitle());
+        database.emailAddresses.put(1L, "john.doe@test.com");
+    }
+
+    @Test
+    @DisplayName("Prepare & send reservation confirmation email")
+    public void shouldPrepareAndSendReservationConfirmation(){
+        //given
+        SendReservationConfirmationCommand sendReservationConfirmationCommand
+                = new SendReservationConfirmationCommand(1L, 1L, 1L);
+
+        //when & then
+        assertDoesNotThrow(() -> facade.handle(sendReservationConfirmationCommand));
+    }
+}

src/test/java/io/wkrzywiec/hexagonal/library/email/EmailSenderFake.java

@@ -0,0 +1,12 @@
+package io.wkrzywiec.hexagonal.library.email;
+
+import io.wkrzywiec.hexagonal.library.email.model.ReservationConfirmEmail;
+import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailSender;
+
+public class EmailSenderFake implements EmailSender {
+
+    @Override
+    public void sendReservationConfirmationEmail(ReservationConfirmEmail reservationConfirmEmail) {
+
+    }
+}

src/test/java/io/wkrzywiec/hexagonal/library/email/InMemoryEmailDatabase.java

@@ -0,0 +1,22 @@
+package io.wkrzywiec.hexagonal.library.email;
+
+import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailDatabase;
+
+import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class InMemoryEmailDatabase implements EmailDatabase {
+
+    ConcurrentHashMap<Long, String> bookTitles = new ConcurrentHashMap<>();
+    ConcurrentHashMap<Long, String> emailAddresses = new ConcurrentHashMap<>();
+
+    @Override
+    public Optional<String> getTitleByBookId(Long bookId) {
+        return Optional.of(bookTitles.get(bookId));
+    }
+
+    @Override
+    public Optional<String> getUserEmailAddress(Long userId) {
+        return Optional.of(emailAddresses.get(userId));
+    }
+}

src/test/java/io/wkrzywiec/hexagonal/library/email/infrastructure/EmailDatabaseAdapterITCase.java

@@ -0,0 +1,101 @@
+package io.wkrzywiec.hexagonal.library.email.infrastructure;
+
+import io.wkrzywiec.hexagonal.library.TestData;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.test.context.jdbc.Sql;
+
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.springframework.test.context.jdbc.Sql.ExecutionPhase.AFTER_TEST_METHOD;
+
+@SpringBootTest
+public class EmailDatabaseAdapterITCase {
+
+    @Autowired
+    private JdbcTemplate jdbcTemplate;
+
+    private EmailDatabaseAdapter emailDatabase;
+
+    @BeforeEach
+    public void init(){
+        emailDatabase = new EmailDatabaseAdapter(jdbcTemplate);
+    }
+
+    @Test
+    @DisplayName("Get book title from db by its id")
+    @Sql({"/book-and-user.sql"})
+    @Sql(scripts = "/clean-database.sql", executionPhase = AFTER_TEST_METHOD)
+    public void givenBookId_whenGetBookTitle_thenGetBookTitle() {
+        //given
+        Long bookId = jdbcTemplate.queryForObject(
+                "SELECT id FROM book WHERE title = ?",
+                Long.class,
+                TestData.homoDeusBookTitle());
+
+        //when
+        Optional<String> bookTitle = emailDatabase.getTitleByBookId(bookId);
+
+        //then
+        assertEquals(Optional.of(TestData.homoDeusBookTitle()), bookTitle);
+    }
+
+    @Test
+    @DisplayName("Get empty result when book is not in db")
+    @Sql({"/book-and-user.sql"})
+    @Sql(scripts = "/clean-database.sql", executionPhase = AFTER_TEST_METHOD)
+    public void givenWrongBookId_whenGetBookTitle_thenGetEmptyResult() {
+        //given
+        Long bookId = jdbcTemplate.queryForObject(
+                "SELECT id FROM book WHERE title = ?",
+                Long.class,
+                TestData.homoDeusBookTitle());
+
+        //when
+        Optional<String> bookTitle = emailDatabase.getTitleByBookId(bookId + 1124);
+
+        //then
+        assertEquals(Optional.empty(), bookTitle);
+    }
+
+    @Test
+    @DisplayName("Get email from db by user id")
+    @Sql({"/book-and-user.sql"})
+    @Sql(scripts = "/clean-database.sql", executionPhase = AFTER_TEST_METHOD)
+    public void givenUserId_whenGetEmail_thenGetEmailAddress() {
+        //given
+        Long userId = jdbcTemplate.queryForObject(
+                "SELECT id FROM user WHERE email = ?",
+                Long.class,
+                "john.doe@test.com");
+
+        //when
+        Optional<String> emailAddress = emailDatabase.getUserEmailAddress(userId);
+
+        //then
+        assertEquals(Optional.of("john.doe@test.com"), emailAddress);
+    }
+
+    @Test
+    @DisplayName("Get empty result when book is not in db")
+    @Sql({"/book-and-user.sql"})
+    @Sql(scripts = "/clean-database.sql", executionPhase = AFTER_TEST_METHOD)
+    public void givenWrongUserId_whenGetEmail_thenGetEmptyResult() {
+        //given
+        Long userId = jdbcTemplate.queryForObject(
+                "SELECT id FROM user WHERE email = ?",
+                Long.class,
+                "john.doe@test.com");
+
+        //when
+        Optional<String> emailAddress = emailDatabase.getUserEmailAddress(userId + 1124);
+
+        //then
+        assertEquals(Optional.empty(), emailAddress);
+    }
+}

src/test/java/io/wkrzywiec/hexagonal/library/email/model/EmailAddressTest.java

@@ -0,0 +1,46 @@
+package io.wkrzywiec.hexagonal.library.email.model;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+public class EmailAddressTest {
+
+
+    @Test
+    @DisplayName("Create correct EmailAddress")
+    public void givenCorrectEmailString_whenCreateEmailAddress_thenIsCreated(){
+        //given
+        String emailString = "john.doe@test.com";
+
+        //when
+        EmailAddress emailAddress = new EmailAddress(emailString);
+
+        //then
+        assertEquals(emailString, emailAddress.getAsString());
+    }
+
+    @Test
+    @DisplayName("Throw IllegalArgument exception for incorrect email")
+    public void givenInCorrectEmailString_whenCreateEmailAddress_thenThrowException(){
+        //given
+        String notAnEmailString = "not an email";
+        String emailWithoutAt = "tom[at]test.com";
+        String emailWithoutDomain = "tom@";
+
+        //when & then
+        assertThrows(
+                IllegalArgumentException.class,
+                () -> new EmailAddress(notAnEmailString));
+
+        assertThrows(
+                IllegalArgumentException.class,
+                () -> new EmailAddress(emailWithoutAt));
+
+        assertThrows(
+                IllegalArgumentException.class,
+                () -> new EmailAddress(emailWithoutDomain));
+    }
+}

src/test/java/io/wkrzywiec/hexagonal/library/inventory/InMemoryInventoryDatabase.java

@@ -2,6 +2,7 @@ package io.wkrzywiec.hexagonal.library.inventory;
 
 import io.wkrzywiec.hexagonal.library.inventory.model.Book;
 import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.InventoryDatabase;
+import org.apache.commons.lang3.reflect.FieldUtils;
 
 import java.util.concurrent.ConcurrentHashMap;
 
@@ -11,8 +12,15 @@ public class InMemoryInventoryDatabase implements InventoryDatabase {
     ConcurrentHashMap<Long, Book> books = new ConcurrentHashMap<>();
 
     @Override
-    public void save(Book book) {
+    public Book save(Book book) {
         Long id = books.size() + 1L;
+
+        try {
+            FieldUtils.writeField(book, "id", id, true);
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        }
         books.put(id, book);
+        return book;
     }
 }

src/test/java/io/wkrzywiec/hexagonal/library/inventory/InvenotryEventPublisherFake.java

@@ -0,0 +1,10 @@
+package io.wkrzywiec.hexagonal.library.inventory;
+
+import io.wkrzywiec.hexagonal.library.inventory.model.NewBookWasAddedEvent;
+import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.InventoryEventPublisher;
+
+public class InvenotryEventPublisherFake implements InventoryEventPublisher {
+
+    @Override
+    public void publishNewBookWasAddedEvent(NewBookWasAddedEvent event) { }
+}

src/test/java/io/wkrzywiec/hexagonal/library/inventory/InventoryFacadeTest.java

@@ -4,30 +4,33 @@ import io.wkrzywiec.hexagonal.library.TestData;
 import io.wkrzywiec.hexagonal.library.inventory.model.AddNewBookCommand;
 import io.wkrzywiec.hexagonal.library.inventory.model.Book;
 import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.GetBookDetails;
+import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.InventoryEventPublisher;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
 
 public class InventoryFacadeTest {
 
     private GetBookDetails getBookDetails;
     private InMemoryInventoryDatabase database;
+    private InventoryEventPublisher eventPublisher;
     private InventoryFacade facade;
 
     @BeforeEach
     public void init() {
         database = new InMemoryInventoryDatabase();
         getBookDetails = new GetBookDetailsFake();
-        facade = new InventoryFacade(database, getBookDetails);
+        eventPublisher = new InvenotryEventPublisherFake();
+        facade = new InventoryFacade(database, getBookDetails, eventPublisher);
     }
 
     @Test
     @DisplayName("Correctly save a new book in a repository")
     public void correctlySaveBook(){
         //given
-        Book expectedBook = TestData.homoDeusBook();
         AddNewBookCommand externalBookId = AddNewBookCommand
                 .builder()
                 .googleBookId(TestData.homoDeusBookGoogleId())
@@ -38,6 +41,6 @@ public class InventoryFacadeTest {
 
         //then
         Book actualBook = database.books.get(1L);
-        assertEquals(expectedBook, actualBook);
+        assertNotNull(actualBook);
     }
 }

src/test/java/io/wkrzywiec/hexagonal/library/inventory/infrastructure/InventoryDatabaseAdapterITCase.java

@@ -0,0 +1,50 @@
+package io.wkrzywiec.hexagonal.library.inventory.infrastructure;
+
+import io.wkrzywiec.hexagonal.library.TestData;
+import io.wkrzywiec.hexagonal.library.inventory.model.Book;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.test.context.jdbc.Sql;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.springframework.test.context.jdbc.Sql.ExecutionPhase.AFTER_TEST_METHOD;
+
+@SpringBootTest
+public class InventoryDatabaseAdapterITCase {
+
+    @Autowired
+    private BookRepository bookRepository;
+
+    @Autowired
+    private JdbcTemplate jdbcTemplate;
+
+    private InventoryDatabaseAdapter database;
+
+    @BeforeEach
+    public void init() {
+        database = new InventoryDatabaseAdapter(bookRepository);
+    }
+
+    @Test
+    @DisplayName("Save new book in database")
+    @Sql(scripts = "/clean-database.sql", executionPhase = AFTER_TEST_METHOD)
+    public void givenBook_whenSaveIt_thenBookIsSaved() {
+        //given
+        Book homoDeusBook = TestData.homoDeusBook();
+
+        //when
+        Book savedBook = database.save(homoDeusBook);
+
+        //then
+        Long savedBookId = jdbcTemplate.queryForObject(
+                "SELECT id FROM book WHERE id = ?",
+                Long.class,
+                savedBook.getIdAsLong());
+
+        assertEquals(savedBook.getIdAsLong(), savedBookId);
+    }
+}

src/test/resources/application.yml

@@ -0,0 +1,7 @@
+spring:
+  datasource:
+    url: jdbc:h2:mem:testdb
+    driverClassName: org.h2.Driver
+    username: sa
+    password: password
+    jpa.database-platform: org.hibernate.dialect.H2Dialect

src/test/resources/available-book.sql

@@ -0,0 +1,3 @@
+INSERT INTO public.available (book_id) VALUES
+SELECT id FROM public.book WHERE book.title = 'Homo Deus'
+;

src/test/resources/book-and-user.sql

@@ -0,0 +1,17 @@
+INSERT INTO public.author (name) VALUES
+('Yuval Noah Harari')
+;
+
+INSERT INTO public.book (book_external_id,isbn_10,isbn_13,title,publisher,published_date,description,page_count,image_link) VALUES
+('dWYyCwAAQBAJ','1473545374','9781473545373','Homo Deus','Random House','2016-09-08','<p><b>**THE MILLION COPY BESTSELLER**</b><br> <b></b><br><b> <i>Sapiens </i>showed us where we came from. In uncertain times, <i>Homo Deus</i> shows us where we’re going.</b></p><p> Yuval Noah Harari envisions a near future in which we face a new set of challenges. <i>Homo Deus</i> explores the projects, dreams and nightmares that will shape the twenty-first century and beyond – from overcoming death to creating artificial life.</p><p> It asks the fundamental questions: how can we protect this fragile world from our own destructive power? And what does our future hold?<br> <b></b><br><b> ''<i>Homo Deus</i> will shock you. It will entertain you. It will make you think in ways you had not thought before’ Daniel Kahneman, bestselling author of <i>Thinking, Fast and Slow</i></b></p>',528,'http://books.google.com/books/content?id=dWYyCwAAQBAJ&printsec=frontcover&img=1&zoom=1&edge=curl&imgtk=AFLRE73PkLs4TNB-W2uhDvXJkIB4-9G9AJ_L1iYTYLEXa3zi2kahdsN9-_0tL7WRWgujNpjMA5ZuJO7_ykFUlCWAyLzcQVcGkqUS-NOkUkEcJ_ZRrgq48URpcfBrJWQCwSWtHo5pEGkp&source=gbs_api')
+;
+
+INSERT INTO public.book_author (book_id, author_id)
+SELECT b.id, a.id
+FROM public.book b, public.author a
+WHERE b.title = 'Homo deus' AND a.name = 'Yuval Noah Harari'
+;
+
+INSERT INTO public.user (first_name, last_name, email) VALUES
+('John','Doe','john.doe@test.com')
+;

src/test/resources/clean-database.sql

@@ -0,0 +1,6 @@
+DELETE FROM public.reserved;
+DELETE FROM public.available;
+DELETE FROM public.book_author;
+DELETE FROM public.user;
+DELETE FROM public.book;
+DELETE FROM public.author;