diff --git a/src/Banquale/UnitTest/ConsultantTest.cs b/src/Banquale/UnitTest/ConsultantTest.cs
index c1bad5f..08ac219 100644
--- a/src/Banquale/UnitTest/ConsultantTest.cs
+++ b/src/Banquale/UnitTest/ConsultantTest.cs
@@ -1,11 +1,34 @@
 using System;
+using Model;
+
 namespace UnitTest
 {
-	public class ConsultantTest
-	{
-		public ConsultantTest()
-		{
-		}
-	}
-}
+    /// \file
+    /// \brief Fichier de tests pour la classe Consultant.
+    /// \author Votre nom
+
+    /// <summary>
+    /// Classe de tests pour la classe Consultant.
+    /// </summary>
+    public class ConsultantTests
+    {
+        /// <summary>
+        /// Teste si la liste des messages du consultant est initialisée correctement.
+        /// </summary>
+        [Fact]
+        public void Constructor_MessagesListInitialized()
+        {
+            // Arrange
+            string name = "Doe";
+            string firstName = "John";
+            string password = "123456";
 
+            // Act
+            Consultant consultant = new Consultant(name, firstName, password);
+
+            // Assert
+            Assert.NotNull(consultant.MessagesList);
+            Assert.Empty(consultant.MessagesList);
+        }
+    }
+}
diff --git a/src/Banquale/UnitTest/CustomerTest.cs b/src/Banquale/UnitTest/CustomerTest.cs
index ab3bbd2..0537481 100644
--- a/src/Banquale/UnitTest/CustomerTest.cs
+++ b/src/Banquale/UnitTest/CustomerTest.cs
@@ -1,11 +1,78 @@
 using System;
+using Model;
+
 namespace UnitTest
 {
-	public class CustomerTest
-	{
-		public CustomerTest()
-		{
-		}
-	}
-}
+    /// \file
+    /// \brief Fichier de tests pour la classe Customer.
+    /// \author Votre nom
+
+    /// <summary>
+    /// Classe de tests pour la classe Customer.
+    /// </summary>
+    public class CustomerTests
+    {
+        /// <summary>
+        /// Teste si la liste des comptes du client est initialisée correctement.
+        /// </summary>
+        [Fact]
+        public void Constructor_AccountsListInitialized()
+        {
+            // Arrange
+            string name = "Doe";
+            string firstName = "John";
+            string password = "123456";
+
+            // Act
+            Customer customer = new Customer(name, firstName, password);
+
+            // Assert
+            Assert.NotNull(customer.AccountsList);
+            Assert.Empty(customer.AccountsList);
+        }
+
+        /// <summary>
+        /// Teste l'égalité entre deux clients.
+        /// </summary>
+        [Fact]
+        public void Equals_TwoEqualCustomers_ReturnsTrue()
+        {
+            // Arrange
+            string name1 = "Doe";
+            string firstName1 = "John";
+            string password1 = "123456";
+            string name2 = "Doe";
+            string firstName2 = "John";
+            string password2 = "123456";
 
+            // Act
+            Customer customer1 = new Customer(name1, firstName1, password1);
+            Customer customer2 = new Customer(name2, firstName2, password2);
+
+            // Assert
+            Assert.True(customer1.Equals(customer2));
+        }
+
+        /// <summary>
+        /// Teste l'égalité entre deux clients avec des identifiants différents.
+        /// </summary>
+        [Fact]
+        public void Equals_TwoDifferentCustomers_ReturnsFalse()
+        {
+            // Arrange
+            string name1 = "Doe";
+            string firstName1 = "John";
+            string password1 = "123456";
+            string name2 = "Smith";
+            string firstName2 = "Jane";
+            string password2 = "abcdef";
+
+            // Act
+            Customer customer1 = new Customer(name1, firstName1, password1);
+            Customer customer2 = new Customer(name2, firstName2, password2);
+
+            // Assert
+            Assert.False(customer1.Equals(customer2));
+        }
+    }
+}
diff --git a/src/Banquale/UnitTest/IPersistenceManagerTest.cs b/src/Banquale/UnitTest/IPersistenceManagerTest.cs
new file mode 100644
index 0000000..4da37ce
--- /dev/null
+++ b/src/Banquale/UnitTest/IPersistenceManagerTest.cs
@@ -0,0 +1,81 @@
+using System;
+using Model;
+
+namespace UnitTest
+{
+    /// \file
+    /// \brief Fichier de tests pour l'interface IPersistenceManager.
+    /// \author Votre nom
+
+    /// <summary>
+    /// Classe de tests pour l'interface IPersistenceManager.
+    /// </summary>
+    public class PersistenceManagerTests
+    {
+        /// <summary>
+        /// Teste la sauvegarde des données.
+        /// </summary>
+        [Fact]
+        public void DataSave_ValidData_CallsDataSave()
+        {
+            // Arrange
+            MockPersistenceManager persistenceManager = new MockPersistenceManager();
+            List<Customer> customersList = new List<Customer> { new Customer("Doe", "John", "123456") };
+            Consultant consultant = new Consultant("Smith", "Jane", "abcdef");
+
+            // Act
+            persistenceManager.DataSave(customersList, consultant);
+
+            // Assert
+            Assert.True(persistenceManager.DataSaveCalled);
+            Assert.Equal(customersList, persistenceManager.SavedCustomersList);
+            Assert.Equal(consultant, persistenceManager.SavedConsultant);
+        }
+
+        /// <summary>
+        /// Teste le chargement des données.
+        /// </summary>
+        [Fact]
+        public void DataLoad_CallsDataLoad_ReturnsData()
+        {
+            // Arrange
+            MockPersistenceManager persistenceManager = new MockPersistenceManager();
+            List<Customer> customersList = new List<Customer> { new Customer("Doe", "John", "123456") };
+            Consultant consultant = new Consultant("Smith", "Jane", "abcdef");
+            persistenceManager.DataToLoad = (customersList, consultant);
+
+            // Act
+            var result = persistenceManager.DataLoad();
+
+            // Assert
+            Assert.True(persistenceManager.DataLoadCalled);
+            Assert.Equal(customersList, result.Item1);
+            Assert.Equal(consultant, result.Item2);
+        }
+
+        /// <summary>
+        /// Classe de mock pour le gestionnaire de persistance.
+        /// </summary>
+        private class MockPersistenceManager : IPersistenceManager
+        {
+            public bool DataSaveCalled { get; private set; }
+            public bool DataLoadCalled { get; private set; }
+            public (List<Customer>, Consultant) DataToLoad { get; set; }
+            public List<Customer>? SavedCustomersList { get; private set; }
+            public Consultant? SavedConsultant { get; private set; }
+
+            public void DataSave(List<Customer> customersList, Consultant consultant)
+            {
+                DataSaveCalled = true;
+                SavedCustomersList = customersList;
+                SavedConsultant = consultant;
+            }
+
+            public (List<Customer>, Consultant) DataLoad()
+            {
+                DataLoadCalled = true;
+                return DataToLoad;
+            }
+        }
+    }
+}
diff --git a/src/Banquale/UnitTest/ManagerTest.cs b/src/Banquale/UnitTest/ManagerTest.cs
index aaf7cbb..69a308a 100644
--- a/src/Banquale/UnitTest/ManagerTest.cs
+++ b/src/Banquale/UnitTest/ManagerTest.cs
@@ -1,11 +1,137 @@
 using System;
+using Model;
+
 namespace UnitTest
 {
-	public class ManagerTest
-	{
-		public ManagerTest()
-		{
-		}
-	}
-}
+    /// \file
+    /// \brief Fichier de tests pour la classe Manager.
+    /// \author Votre nom
+
+    /// <summary>
+    /// Classe de tests pour la classe Manager.
+    /// </summary>
+    public class ManagerTests
+    {
+        /// <summary>
+        /// Teste si la liste des clients est initialisée correctement.
+        /// </summary>
+        [Fact]
+        public void Constructor_CustomersListInitialized()
+        {
+            // Arrange
+            Manager manager = new Manager();
+
+            // Act
+
+            // Assert
+            Assert.NotNull(manager.CustomersList);
+            Assert.Empty(manager.CustomersList);
+        }
+
+        /// <summary>
+        /// Teste l'ajout d'un client à la liste des clients.
+        /// </summary>
+        [Fact]
+        public void AddCustomer_ValidCustomer_ReturnsTrue()
+        {
+            // Arrange
+            Manager manager = new Manager();
+            Customer customer = new Customer("Doe", "John", "123456");
+
+            // Act
+            bool result = manager.AddCustomer(customer);
+
+            // Assert
+            Assert.True(result);
+            Assert.Contains(customer, manager.CustomersList);
+        }
+
+        /// <summary>
+        /// Teste la récupération d'un client à partir de la liste des clients.
+        /// </summary>
+        [Fact]
+        public void GetCustomer_ValidPosition_ReturnsCustomer()
+        {
+            // Arrange
+            Manager manager = new Manager();
+            Customer customer1 = new Customer("Doe", "John", "123456");
+            Customer customer2 = new Customer("Smith", "Jane", "abcdef");
+            manager.AddCustomer(customer1);
+            manager.AddCustomer(customer2);
+
+            // Act
+            Customer result = manager.GetCustomer(1);
 
+            // Assert
+            Assert.Equal(customer2, result);
+        }
+
+        /// <summary>
+        /// Teste la sauvegarde des données.
+        /// </summary>
+        [Fact]
+        public void DataSave_ValidData_CallsPersistenceManagerDataSave()
+        {
+            // Arrange
+            MockPersistenceManager persistenceManager = new MockPersistenceManager();
+            Manager manager = new Manager(persistenceManager);
+            Customer customer = new Customer("Doe", "John", "123456");
+            manager.AddCustomer(customer);
+
+            // Act
+            manager.DataSave();
+
+            // Assert
+            Assert.True(persistenceManager.DataSaveCalled);
+            Assert.Equal(manager.CustomersList, persistenceManager.SavedCustomersList);
+            Assert.Equal(manager.Consultant, persistenceManager.SavedConsultant);
+        }
+
+        /// <summary>
+        /// Teste le chargement des données.
+        /// </summary>
+        [Fact]
+        public void DataLoad_ValidData_CallsPersistenceManagerDataLoad()
+        {
+            // Arrange
+            MockPersistenceManager persistenceManager = new MockPersistenceManager();
+            Manager manager = new Manager(persistenceManager);
+            Customer customer = new Customer("Doe", "John", "123456");
+            Consultant consultant = new Consultant("Smith", "Jane", "abcdef");
+            persistenceManager.DataToLoad = (new List<Customer> { customer }, consultant);
+
+            // Act
+            manager.DataLoad();
+
+            // Assert
+            Assert.True(persistenceManager.DataLoadCalled);
+            Assert.Contains(customer, manager.CustomersList);
+            Assert.Equal(consultant, manager.Consultant);
+        }
+
+        /// <summary>
+        /// Classe de mock pour le gestionnaire de persistance.
+        /// </summary>
+        private class MockPersistenceManager : IPersistenceManager
+        {
+            public bool DataSaveCalled { get; private set; }
+            public bool DataLoadCalled { get; private set; }
+            public (List<Customer>, Consultant) DataToLoad { get; set; }
+            public List<Customer>? SavedCustomersList { get; private set; }
+            public Consultant? SavedConsultant { get; private set; }
+
+            public void DataSave(List<Customer> customersList, Consultant consultant)
+            {
+                DataSaveCalled = true;
+                SavedCustomersList = customersList;
+                SavedConsultant = consultant;
+            }
+
+            public (List<Customer>, Consultant) DataLoad()
+            {
+                DataLoadCalled = true;
+                return DataToLoad;
+            }
+        }
+    }
+}
diff --git a/src/Banquale/UnitTest/PersonTest.cs b/src/Banquale/UnitTest/PersonTest.cs
index 86f7ee0..1b6b155 100644
--- a/src/Banquale/UnitTest/PersonTest.cs
+++ b/src/Banquale/UnitTest/PersonTest.cs
@@ -1,11 +1,62 @@
-using System;
+/// \file
+/// \brief Définition de la classe Person.
+/// \author Votre nom
+
+using System;
+using Model;
+
 namespace UnitTest
 {
-	public class PersonTest
-	{
-		public PersonTest()
-		{
-		}
-	}
-}
+    /// \file
+    /// \brief Fichier de tests pour la classe Person.
+    /// \author Votre nom
+
+    /// <summary>
+    /// Classe de tests pour la classe Person.
+    /// </summary>
+    public class PersonTest
+    {
+        /// <summary>
+        /// Teste si les propriétés de l'objet Person sont correctement définies lorsque les arguments du constructeur sont valides.
+        /// </summary>
+        [Fact]
+        public void Constructor_ValidArguments_PropertiesSet()
+        {
+            // Arrange
+            string name = "Doe";
+            string firstName = "John";
+            string password = "123456";
+
+            // Act
+            Person person = new Person(name, firstName, password);
 
+            // Assert
+            Assert.Equal(name, person.Name);
+            Assert.Equal(firstName, person.FirstName);
+            Assert.Equal(password, person.Password);
+        }
+
+        /// <summary>
+        /// Teste si l'identifiant de chaque instance de Person est correctement incrémenté.
+        /// </summary>
+        [Fact]
+        public void Constructor_IncrementId()
+        {
+            // Arrange
+            string name1 = "Doe";
+            string firstName1 = "John";
+            string password1 = "123456";
+            string name2 = "Smith";
+            string firstName2 = "Jane";
+            string password2 = "abcdef";
+
+            // Act
+            Person person1 = new Person(name1, firstName1, password1);
+            Person person2 = new Person(name2, firstName2, password2);
+
+            // Assert
+            Assert.Equal(Convert.ToUInt32(0), person1.Id);
+            Assert.Equal(Convert.ToUInt32(1), person2.Id);
+        }
+    }
+}
diff --git a/src/Banquale/UnitTest/TransactionTest.cs b/src/Banquale/UnitTest/TransactionTest.cs
index d85e7be..f490fe2 100644
--- a/src/Banquale/UnitTest/TransactionTest.cs
+++ b/src/Banquale/UnitTest/TransactionTest.cs
@@ -28,9 +28,9 @@ namespace UnitTest
             Console.WriteLine("Transaction:");
             Console.WriteLine($"Type: {(transaction.Type ? "Débit" : "Crédit")}");
             Console.WriteLine($"Somme: {transaction.Sum}");
-            Console.WriteLine($"Compte impliqué: {transaction.InvolvedAccounts.Name}");
-            Console.WriteLine($"Catégorie: {transaction.Category}");
-            Console.WriteLine($"Date: {transaction.Date}");
+            Console.WriteLine($"Compte impliqué: {transaction?.InvolvedAccounts?.Name}");
+            Console.WriteLine($"Catégorie: {transaction?.Category}");
+            Console.WriteLine($"Date: {transaction?.Date}");
 
             Console.ReadLine();
         }