diff --git a/notus/Tests/UnitTests_Model/Note_Tests.cs b/notus/Tests/UnitTests_Model/Note_Tests.cs
index 34f65b7..29a9902 100644
--- a/notus/Tests/UnitTests_Model/Note_Tests.cs
+++ b/notus/Tests/UnitTests_Model/Note_Tests.cs
@@ -1,4 +1,5 @@
-using System;
+using Biblioteque_de_Class;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -6,17 +7,259 @@ using System.Threading.Tasks;
 
 namespace UnitTests_Model
 {
+    [TestFixture]
     public class Note_Tests
     {
+        private User owner;
+        private Note note;
+
         [SetUp]
         public void Setup()
         {
+            owner = new User("John", "john@example.com", "password123");
+            note = new Note(1, "Note 1", "logoPath", owner);
+        }
+
+        [Test]
+        public void Note_Constructor_InitializesProperties()
+        {
+            Assert.That(note.id, Is.EqualTo(1));
+            Assert.That(note.Name, Is.EqualTo("Note 1"));
+            Assert.That(note.LogoPath, Is.EqualTo("logoPath"));
+            Assert.That(note.Owner, Is.EqualTo(owner));
+            Assert.That(note.ImageList.Count, Is.EqualTo(0));
+            Assert.That(note.Collaborators.Count, Is.EqualTo(0));
+            Assert.That(note.Editors.Count, Is.EqualTo(1));
+            Assert.That(note.Editors[0], Is.EqualTo(owner));
+        }
+
+        [Test]
+        public void Note_VerifyOwner_UserIsOwner_ReturnsTrue()
+        {
+            bool result = note.VerifyOwner(owner);
+            Assert.IsTrue(result);
+        }
+
+        [Test]
+        public void Note_VerifyOwner_UserIsNotOwner_ThrowsNotAllowedException()
+        {
+            User otherUser = new User("Jane", "jane@example.com", "password123");
+
+            Assert.Throws<NotAllowedException>(() => note.VerifyOwner(otherUser));
+        }
+
+        [Test]
+        public void Note_AddImage_ValidData_AddsImage()
+        {
+            string imageLink = "imageLink";
+            List<int> position = new List<int> { 1, 2, 3 };
+
+            note.AddImage(imageLink, position);
+
+            Assert.That(note.ImageList.Count, Is.EqualTo(1));
+            Assert.That(note.ImageList[0].Name, Is.EqualTo("1"));
+            Assert.That(note.ImageList[0].ImageLink, Is.EqualTo(imageLink));
+            Assert.That(note.ImageList[0].Position, Is.EqualTo(position));
+        }
+
+        [Test]
+        public void Note_RemoveImage_ExistingImage_RemovesImage()
+        {
+            string imageLink = "imageLink";
+            List<int> position = new List<int> { 1, 2, 3 };
+            note.AddImage(imageLink, position);
+
+            note.RemoveImage("1");
+
+            Assert.That(note.ImageList.Count, Is.EqualTo(0));
+        }
+
+        [Test]
+        public void Note_RemoveImage_NonExistingImage_ThrowsNotFoundException()
+        {
+            string imageLink = "imageLink";
+            List<int> position = new List<int> { 1, 2, 3 };
+            note.AddImage(imageLink, position);
+
+            Assert.Throws<NotFoundException>(() => note.RemoveImage("2"));
+        }
+
+        [Test]
+        public void Note_AddText_UserIsOwner_AddsText()
+        {
+            User user = owner;
+            string text = "Some text";
+
+            note.AddText(user, text);
+
+            Assert.That(note.Text, Is.EqualTo("\n" + text));
+            Assert.That(note.ModificationDate, Is.EqualTo(DateOnly.FromDateTime(DateTime.Now)));
+        }
+
+        [Test]
+        public void Note_AddText_UserIsEditor_AddsText()
+        {
+            User user = new User("Editor", "editor@example.com", "password123");
+            note.AddEditor(owner, user);
+            string text = "Some text";
+
+            note.AddText(user, text);
+
+            Assert.That(note.Text, Is.EqualTo("\n"+text));
+            Assert.That(note.ModificationDate, Is.EqualTo(DateOnly.FromDateTime(DateTime.Now)));
+        }
+
+        [Test]
+        public void Note_AddText_UserIsNotOwnerOrEditor_ThrowsNotAllowedException()
+        {
+            User user = new User("Jane", "jane@example.com", "password123");
+            string text = "Some text";
+
+            Assert.Throws<NotAllowedException>(() => note.AddText(user, text));
+        }
+
+        [Test]
+        public void Note_VerifyPrivilege_UserIsEditor_ReturnsTrue()
+        {
+            User editor = new User("Editor", "editor@example.com", "password123");
+            note.AddEditor(owner, editor);
+
+            bool result = note.VerifyPrivilege(editor);
+
+            Assert.IsTrue(result);
+        }
+
+        [Test]
+        public void Note_VerifyPrivilege_UserIsNotEditor_ReturnsFalse()
+        {
+            User user = new User("User", "user@example.com", "password123");
+
+            bool result = note.VerifyPrivilege(user);
+
+            Assert.IsFalse(result);
+        }
+
+        [Test]
+        public void Note_AddCollaborator_UserIsOwner_AddsCollaborator()
+        {
+            User collaborator = new User("Collaborator", "collaborator@example.com", "password123");
+
+            note.AddCollaborator(owner, collaborator);
+
+            Assert.That(note.Collaborators.Count, Is.EqualTo(1));
+            Assert.That(note.Collaborators[0], Is.EqualTo(collaborator));
+            Assert.IsTrue(collaborator.NoteList.Contains(note));
+        }
+
+        [Test]
+        public void Note_AddCollaborator_UserIsNotOwner_ThrowsNotAllowedException()
+        {
+            User otherUser = new User("OtherUser", "otheruser@example.com", "password123");
+            User collaborator = new User("Collaborator", "collaborator@example.com", "password123");
+
+            Assert.Throws<NotAllowedException>(() => note.AddCollaborator(otherUser, collaborator));
+        }
+
+        [Test]
+        public void Note_RemoveCollaborator_UserIsOwner_RemovesCollaborator()
+        {
+            User collaborator = new User("Collaborator", "collaborator@example.com", "password123");
+            note.AddCollaborator(owner, collaborator);
+
+            note.RemoveCollaborator(owner, collaborator);
+
+            Assert.That(note.Collaborators.Count, Is.EqualTo(0));
+            Assert.IsFalse(collaborator.NoteList.Contains(note));
         }
 
         [Test]
-        public void Test1()
+        public void Note_RemoveCollaborator_UserIsNotOwner_ThrowsNotAllowedException()
         {
-            Assert.Pass();
+            User otherUser = new User("OtherUser", "otheruser@example.com", "password123");
+            User collaborator = new User("Collaborator", "collaborator@example.com", "password123");
+            note.AddCollaborator(owner, collaborator);
+
+            Assert.Throws<NotAllowedException>(() => note.RemoveCollaborator(otherUser, collaborator));
+        }
+
+        [Test]
+        public void Note_AddEditor_UserAlreadyEditor_ThrowsAlreadyExistException()
+        {
+            User editor = new User("Editor", "editor@example.com", "password123");
+            note.AddEditor(owner, editor);
+
+            Assert.Throws<AlreadyExistException>(() => note.AddEditor(owner, editor));
+        }
+
+        [Test]
+        public void Note_AddEditor_UserIsOwner_AddsEditor()
+        {
+            User editor = new User("Editor", "editor@example.com", "password123");
+
+            note.AddEditor(owner, editor);
+
+            Assert.That(note.Editors.Count, Is.EqualTo(2));
+            Assert.That(note.Editors[1], Is.EqualTo(editor));
+        }
+
+        [Test]
+        public void Note_RemoveEditor_UserNotEditor_ThrowsNotFoundException()
+        {
+            User user = new User("User", "user@example.com", "password123");
+
+            Assert.Throws<NotFoundException>(() => note.RemoveEditor(owner, user));
+        }
+
+        [Test]
+        public void Note_RemoveEditor_UserIsOwner_RemovesEditor()
+        {
+            User editor = new User("Editor", "editor@example.com", "password123");
+            note.AddEditor(owner, editor);
+
+            note.RemoveEditor(owner, editor);
+
+            Assert.That(note.Editors.Count, Is.EqualTo(1));
+            Assert.IsFalse(note.Editors.Contains(editor));
+        }
+
+        [Test]
+        public void Note_ChangeName_UserIsOwner_ChangesName()
+        {
+            User user = owner;
+            string newName = "New Note Name";
+
+            note.ChangeName(user, newName);
+
+            Assert.That(note.Name, Is.EqualTo(newName));
+        }
+
+        [Test]
+        public void Note_ChangeName_UserIsNotOwner_NameNotChanged()
+        {
+            User user = new User("OtherUser", "otheruser@example.com", "password123");
+            string newName = "New Note Name";
+
+            Assert.Throws<NotAllowedException>(() => note.ChangeName(user, newName));
+        }
+
+        [Test]
+        public void Note_ChangeLogo_UserIsOwner_ChangesLogo()
+        {
+            User user = owner;
+            string newLogoPath = "newLogoPath";
+
+            note.ChangeLogo(user, newLogoPath);
+
+            Assert.That(note.LogoPath, Is.EqualTo(newLogoPath));
+        }
+
+        [Test]
+        public void Note_ChangeLogo_UserIsNotOwner_LogoNotChanged()
+        {
+            User user = new User("OtherUser", "otheruser@example.com", "password123");
+            string newLogoPath = "newLogoPath";
+
+            Assert.Throws<NotAllowedException>(() => note.ChangeLogo(user, newLogoPath));
         }
     }
 }
diff --git a/notus/Tests/UnitTests_Model/User_Tests.cs b/notus/Tests/UnitTests_Model/User_Tests.cs
index f7c5aa9..27259eb 100644
--- a/notus/Tests/UnitTests_Model/User_Tests.cs
+++ b/notus/Tests/UnitTests_Model/User_Tests.cs
@@ -1,4 +1,5 @@
-using System;
+using Biblioteque_de_Class;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -8,15 +9,6 @@ namespace UnitTests_Model
 {
     public class User_Tests
     {
-        [SetUp]
-        public void Setup()
-        {
-        }
-
-        [Test]
-        public void Test1()
-        {
-            Assert.Pass();
-        }
+        
     }
 }
diff --git a/notus/Tests/UnitTests_Persistance/Stub_Tests.cs b/notus/Tests/UnitTests_Persistance/Stub_Tests.cs
index 7aee95f..b2d0d00 100644
--- a/notus/Tests/UnitTests_Persistance/Stub_Tests.cs
+++ b/notus/Tests/UnitTests_Persistance/Stub_Tests.cs
@@ -6,7 +6,7 @@ using System.Threading.Tasks;
 
 namespace UnitTests_Persistance
 {
-    internal class Stub_Tests
+    public class Stub_Tests
     {
     }
 }
diff --git a/notus/Tests/UnitTests_Persistance/ToXML_Tests.cs b/notus/Tests/UnitTests_Persistance/ToXML_Tests.cs
index 15b3f6c..d856389 100644
--- a/notus/Tests/UnitTests_Persistance/ToXML_Tests.cs
+++ b/notus/Tests/UnitTests_Persistance/ToXML_Tests.cs
@@ -6,7 +6,7 @@ using System.Threading.Tasks;
 
 namespace UnitTests_Persistance
 {
-    internal class ToXML_Tests
+    public class ToXML_Tests
     {
     }
 }