diff --git a/API_SQLuedo/TestAPI/UserUnitTest.cs b/API_SQLuedo/TestAPI/UserUnitTest.cs
index 39345d0..abdfbfb 100644
--- a/API_SQLuedo/TestAPI/UserUnitTest.cs
+++ b/API_SQLuedo/TestAPI/UserUnitTest.cs
@@ -285,6 +285,36 @@ public class UserUnitTest
             Assert.Equal(400, bdObjectResult.StatusCode);
         }
     }
+    [Fact]
+    public void CreateUserWithExistingEmail()
+    {
+        GetUsersData();
+        _userService.Setup(x => x.CreateUser("Nom", "Passssss", "adressemail@gmail.com", true))
+            .Returns(new UserDto("Nom", "Passssss", "adressemail@gmail.com", true));
+        var usersController = new UsersController(new NullLogger<UsersController>(), _userService.Object);
+
+        var userResult = usersController.CreateUser(new UserDto(null, "Passssss", "adressemail@gmail.com", true));
+
+        if (userResult is BadRequestResult bdObjectResult)
+        {
+            Assert.Equal(400, bdObjectResult.StatusCode);
+        }
+    }
+    [Fact]
+    public void CreateUserWithExistingUsername()
+    {
+        GetUsersData();
+        _userService.Setup(x => x.CreateUser("Useruser", "Passssss", "heudfk@hdye.com", true))
+            .Returns(new UserDto("Useruser", "Passssss", "heudfk@hdye.com", true));
+        var usersController = new UsersController(new NullLogger<UsersController>(), _userService.Object);
+
+        var userResult = usersController.CreateUser(new UserDto("Useruser", "Passssss", "heudfk@hdye.com", true));
+
+        if (userResult is BadRequestResult bdObjectResult)
+        {
+            Assert.Equal(400, bdObjectResult.StatusCode);
+        }
+    }
 
     [Fact]
     public void UpdateUserSuccess()
diff --git a/API_SQLuedo/TestEF/Service/TestUserDataService.cs b/API_SQLuedo/TestEF/Service/TestUserDataService.cs
index 863a10c..9f4638c 100644
--- a/API_SQLuedo/TestEF/Service/TestUserDataService.cs
+++ b/API_SQLuedo/TestEF/Service/TestUserDataService.cs
@@ -253,6 +253,26 @@ public class TestUserDataService
 
         Assert.False(result);
     }
+    [Fact]
+    public void isEmailTaken_ReturnFalse()
+    {
+        _dbContext.Users.Add(new UserEntity() { Id = 1, Username = "Test81", Email = "example81@email.com", Password = "password", IsAdmin = true });
+        _dbContext.SaveChanges();
+
+        var result = _userDataService.IsEmailTaken("example895@email.com");
+
+        Assert.False(result);
+    }
+    [Fact]
+    public void isEmailTaken_ReturnTrue()
+    {
+        _dbContext.Users.Add(new UserEntity() { Id = 1, Username = "Test82", Email = "example82@email.com", Password = "password", IsAdmin = true });
+        _dbContext.SaveChanges();
+
+        var result = _userDataService.IsEmailTaken("example82@email.com");
+
+        Assert.True(result);
+    }
     
     [Fact]
     public void DeleteUserByUsername_WithoutExisting_ReturnsFalse()