diff --git a/src/main/java/io/wkrzywiec/hexagonal/library/BorrowingDomainConfig.java b/src/main/java/io/wkrzywiec/hexagonal/library/BorrowingDomainConfig.java
index c6c1cf3..ff26e6e 100644
--- a/src/main/java/io/wkrzywiec/hexagonal/library/BorrowingDomainConfig.java
+++ b/src/main/java/io/wkrzywiec/hexagonal/library/BorrowingDomainConfig.java
@@ -2,8 +2,11 @@ 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.context.annotation.Configuration;
 import org.springframework.jdbc.core.JdbcTemplate;
@@ -17,7 +20,12 @@ public class BorrowingDomainConfig {
     }
 
     @Bean
-    public MakeBookAvailable makeBookAvailable(BorrowingDatabase database) {
-        return new BorrowingFacade(database);
+    public BorrowingEventPublisher borrowingEventPublisher(ApplicationEventPublisher applicationEventPublisher){
+        return new SpringBorrowingEventPublisherAdapter(applicationEventPublisher);
+    }
+
+    @Bean
+    public MakeBookAvailable makeBookAvailable(BorrowingDatabase database, BorrowingEventPublisher borrowingEventPublisher) {
+        return new BorrowingFacade(database, borrowingEventPublisher);
     }
 }
diff --git a/src/main/java/io/wkrzywiec/hexagonal/library/email/model/EmailAddress.java b/src/main/java/io/wkrzywiec/hexagonal/library/email/model/EmailAddress.java
index c9b3cc7..49eede0 100644
--- a/src/main/java/io/wkrzywiec/hexagonal/library/email/model/EmailAddress.java
+++ b/src/main/java/io/wkrzywiec/hexagonal/library/email/model/EmailAddress.java
@@ -17,4 +17,8 @@ public class EmailAddress {
         }
 
     }
+
+    public String getAsString() {
+        return value;
+    }
 }
diff --git a/src/test/java/io/wkrzywiec/hexagonal/library/borrowing/BorrowingEventPublisherFake.java b/src/test/java/io/wkrzywiec/hexagonal/library/borrowing/BorrowingEventPublisherFake.java
new file mode 100644
index 0000000..31c7bb0
--- /dev/null
+++ b/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) {
+
+    }
+}
diff --git a/src/test/java/io/wkrzywiec/hexagonal/library/borrowing/BorrowingFacadeTest.java b/src/test/java/io/wkrzywiec/hexagonal/library/borrowing/BorrowingFacadeTest.java
index d504a04..5ced4ae 100644
--- a/src/test/java/io/wkrzywiec/hexagonal/library/borrowing/BorrowingFacadeTest.java
+++ b/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
diff --git a/src/test/java/io/wkrzywiec/hexagonal/library/email/model/EmailAddressTest.java b/src/test/java/io/wkrzywiec/hexagonal/library/email/model/EmailAddressTest.java
new file mode 100644
index 0000000..d15a38a
--- /dev/null
+++ b/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));
+    }
+}