diff --git a/testing-modules/mockito/src/test/java/org/baeldung/bddmockito/BDDMockitoTest.java b/testing-modules/mockito/src/test/java/org/baeldung/bddmockito/BDDMockitoTest.java
new file mode 100644
index 0000000000..9cc586fb84
--- /dev/null
+++ b/testing-modules/mockito/src/test/java/org/baeldung/bddmockito/BDDMockitoTest.java
@@ -0,0 +1,104 @@
+package org.baeldung.bddmockito;
+
+import static org.junit.Assert.fail;
+import static org.mockito.BDDMockito.*;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mockito;
+import org.mockito.invocation.InvocationOnMock;
+
+
+public class BDDMockitoTest {
+    
+    PhoneBookService phoneBookService;
+    PhoneBookRepository phoneBookRepository;
+    
+    String momContactName = "Mom";
+    String momPhoneNumber = "01234";
+    String xContactName = "x";
+    String tooLongPhoneNumber = "01111111111111";
+    
+    @Before
+    public void init() {
+        phoneBookRepository = Mockito.mock(PhoneBookRepository.class);
+        phoneBookService = new PhoneBookService(phoneBookRepository);
+    }
+    
+    @Test
+    public void givenValidContactName_whenSearchInPhoneBook_thenRetunPhoneNumber() {
+        given(phoneBookRepository.contains(momContactName)).willReturn(true);
+        given(phoneBookRepository.getPhoneNumberByContactName(momContactName))
+          .will((InvocationOnMock invocation) -> {
+            if(invocation.getArgument(0).equals(momContactName)) {
+                return momPhoneNumber;
+            } else {
+                return null;
+            }
+        });
+        
+        String phoneNumber = phoneBookService.search(momContactName);
+        
+        then(phoneBookRepository).should().contains(momContactName);
+        then(phoneBookRepository).should().getPhoneNumberByContactName(momContactName);
+        Assert.assertEquals(phoneNumber, momPhoneNumber);
+    }
+    
+    @Test
+    public void givenInvalidContactName_whenSearch_thenRetunNull() {
+        given(phoneBookRepository.contains(xContactName)).willReturn(false);
+        
+        String phoneNumber = phoneBookService.search(xContactName);
+        
+        then(phoneBookRepository).should().contains(xContactName);
+        then(phoneBookRepository).should(never()).getPhoneNumberByContactName(xContactName);
+        Assert.assertEquals(phoneNumber, null);
+    }
+    
+    @Test
+    public void givenValidContactNameAndPhoneNumber_whenRegister_thenSucceed() {
+        given(phoneBookRepository.contains(momContactName)).willReturn(false);
+        
+        phoneBookService.register(momContactName, momPhoneNumber);
+        
+        verify(phoneBookRepository).insert(momContactName, momPhoneNumber);
+    }
+    
+    @Test
+    public void givenEmptyPhoneNumber_whenRegister_thenFail() {
+        given(phoneBookRepository.contains(momContactName)).willReturn(false);
+        
+        phoneBookService.register(xContactName, "");
+        
+        then(phoneBookRepository).should(never()).insert(momContactName, momPhoneNumber);
+    }
+    
+    @Test
+    public void givenLongPhoneNumber_whenRegister_thenFail() {
+        given(phoneBookRepository.contains(xContactName)).willReturn(false);
+        willThrow(new RuntimeException())
+          .given(phoneBookRepository).insert(any(String.class), eq(tooLongPhoneNumber));
+        
+        try {
+            phoneBookService.register(xContactName, tooLongPhoneNumber);
+            fail("Should throw exception");
+        } catch (RuntimeException ex) { }
+        
+        then(phoneBookRepository).should(never()).insert(momContactName, tooLongPhoneNumber);
+    }
+    
+    @Test
+    public void givenExistentContactName_whenRegister_thenFail() {
+        given(phoneBookRepository.contains(momContactName))
+          .willThrow(new RuntimeException("Name already exist"));
+        
+        try {
+            phoneBookService.register(momContactName, momPhoneNumber);
+            fail("Should throw exception");
+        } catch(Exception ex) { }
+        
+        then(phoneBookRepository).should(never()).insert(momContactName, momPhoneNumber);
+    }
+
+}
diff --git a/testing-modules/mockito/src/test/java/org/baeldung/bddmockito/PhoneBookRepository.java b/testing-modules/mockito/src/test/java/org/baeldung/bddmockito/PhoneBookRepository.java
new file mode 100644
index 0000000000..b73a1d835c
--- /dev/null
+++ b/testing-modules/mockito/src/test/java/org/baeldung/bddmockito/PhoneBookRepository.java
@@ -0,0 +1,26 @@
+package org.baeldung.bddmockito;
+
+public interface PhoneBookRepository {
+
+	/**
+	 * Insert phone record
+	 * @param name Contact name
+	 * @param phone Phone number
+	 */
+    void insert(String name, String phone);
+    
+    /**
+     * Search for contact phone number
+     * @param name Contact name
+     * @return phone number
+     */
+    String getPhoneNumberByContactName(String name);
+    
+    /**
+     * Check if the phonebook contains this contact
+     * @param name Contact name
+     * @return true if this contact name exists
+     */
+    boolean contains(String name);
+    
+}
diff --git a/testing-modules/mockito/src/test/java/org/baeldung/bddmockito/PhoneBookService.java b/testing-modules/mockito/src/test/java/org/baeldung/bddmockito/PhoneBookService.java
new file mode 100644
index 0000000000..645884af02
--- /dev/null
+++ b/testing-modules/mockito/src/test/java/org/baeldung/bddmockito/PhoneBookService.java
@@ -0,0 +1,34 @@
+package org.baeldung.bddmockito;
+
+public class PhoneBookService {
+    
+    private PhoneBookRepository phoneBookRepository;
+    
+    public PhoneBookService(PhoneBookRepository phoneBookRepository) {
+        this.phoneBookRepository = phoneBookRepository;
+    }
+
+    /**
+     * Register a contact
+     * @param name Contact name
+     * @param phone Phone number
+     */
+    public void register(String name, String phone) {
+        if(!name.isEmpty() && !phone.isEmpty() && !phoneBookRepository.contains(name)) {
+            phoneBookRepository.insert(name, phone);
+        }
+    }
+    
+    /**
+     * Search for a phone number by contact name
+     * @param name Contact name
+     * @return Phone number
+     */
+    public String search(String name) {
+        if(!name.isEmpty() && phoneBookRepository.contains(name)) {
+            return phoneBookRepository.getPhoneNumberByContactName(name);
+        }
+        return null;
+    }
+    
+}