diff --git a/WebApi/UnitTestsEntityManagers/AbstractUnitTestEM.cs b/WebApi/UnitTestsEntityManagers/AbstractUnitTestEM.cs
index 9464ec5..722a36f 100644
--- a/WebApi/UnitTestsEntityManagers/AbstractUnitTestEM.cs
+++ b/WebApi/UnitTestsEntityManagers/AbstractUnitTestEM.cs
@@ -1,11 +1,13 @@
 using DbConnectionLibrairie;
 using Microsoft.Data.Sqlite;
 using Microsoft.EntityFrameworkCore;
+using StubbedDbContextLibrary;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using static Microsoft.EntityFrameworkCore.DbLoggerCategory.Database;
 
 namespace UnitTestsEntityManagers
 {
@@ -15,8 +17,7 @@ namespace UnitTestsEntityManagers
     /// </summary>
     public abstract class AbstractUnitTestEM
     {
-        public MyDbContext dbContext;
-        public HttpClient httpClient;
+        protected DbContextOptions<MyDbContext> opt;
 
         /// <summary>
         /// constructor of the class :
@@ -24,27 +25,25 @@ namespace UnitTestsEntityManagers
         /// </summary>
         public AbstractUnitTestEM()
         {
-            var connection = new SqliteConnection("DataSource=:memory:");
-            connection.Open();
 
-            var opt = new DbContextOptionsBuilder<MyDbContext>()
-                .UseSqlite(connection)
-                .Options;
-
-            dbContext = new MyDbContext(opt);
-
-            dbContext.Database.EnsureCreated();
-
-            httpClient = new HttpClient();
         }
 
-        /// <summary>
-        /// destructor of the class :
-        /// dispose the database context
-        /// </summary>
-        ~AbstractUnitTestEM()
+        protected void creerOpt(string provider, string connectionString)
         {
-            dbContext.Dispose();
+            if(provider == "sqlite")
+            {
+                var connection = new SqliteConnection("DataSource=:memory:");
+
+                connection.Open();
+
+                opt = new DbContextOptionsBuilder<MyDbContext>()
+                    .UseSqlite(connection)
+                    .Options;
+            }
+            else
+            {
+                throw new Exception("provider unknown");
+            }
         }
     }
 }
diff --git a/WebApi/UnitTestsEntityManagers/UnitTestAnswerManager.cs b/WebApi/UnitTestsEntityManagers/UnitTestAnswerManager.cs
index 697793d..d9ca9f2 100644
--- a/WebApi/UnitTestsEntityManagers/UnitTestAnswerManager.cs
+++ b/WebApi/UnitTestsEntityManagers/UnitTestAnswerManager.cs
@@ -1,98 +1,93 @@
 using DbConnectionLibrairie;
 using Entities;
 using EntityManagers;
+using OrderCriterias;
+using StubbedDbContextLibrary;
 
 namespace UnitTestsEntityManagers
 {
     public class UnitTestAnswerManager : AbstractUnitTestEM
     {
 
-        private AnswerEntityManager mgr;
-        public UnitTestAnswerManager()
-            : base()
-        {
-            mgr = new AnswerEntityManager(dbContext);
-        }
-
         /// <summary>
         /// test of the 'ajouterAnswer' method of an AnswerManager
         /// </summary>
         [Fact]
         public async void TestAddAnswer()
         {
-            var answerToAdd = new AnswerEntity { Id = 1, Content = "chateîgne" };
-            var a = await mgr.addAnswer(answerToAdd);
-            // 1) normal insertion
-            // WF : a is the same
-            // as answerToAdd
-            Assert.Equal(answerToAdd.Content, a.Content);
-            Assert.Equal(answerToAdd.Id, a.Id);
-
-            answerToAdd = new AnswerEntity { Id = 5, Content = "damien" };
-            a = await mgr.addAnswer(answerToAdd);
-            // 2) with a random id greater than 0
-            // WF : 'a' content is equal to the
-            // content of 'answerToAdd'
-            // and since it's the second answer
-            // that we add, his id equal 2
-            Assert.Equal(answerToAdd.Content, a.Content);
-            Assert.Equal((uint)2, a.Id);
-
-            answerToAdd = new AnswerEntity { Id = 7, Content = "chateîgne" };
-            a = await mgr.addAnswer(answerToAdd);
-            // 3) with a content that we already have added
-            // WF : the function return the answer which already
-            // have the same content so the content of 'a' is "châteigne"
-            // and his id is 1
-            Assert.Equal("chateîgne", a.Content);
-            Assert.Equal((uint)1, a.Id);
-
-            answerToAdd = new AnswerEntity { Id = 7, Content = "CHATEÎGNE" };
-            a = await mgr.addAnswer(answerToAdd);
-            // 3) with a content that we already have added
-            // but in upperCase instead of lowerCase
-            // WF : the function return the answer which
-            // already have the same content so the content
-            // of 'a' is "chateîgne" and his id is 1
-            Assert.Equal("chateîgne", a.Content);
-            Assert.Equal((uint)1, a.Id);
+            using (var context = new MyDbContext(opt))
+            {
+                await context.Database.EnsureCreatedAsync();
+                var manager = new AnswerEntityManager(context);
+                var answerToAdd = new AnswerEntity { Id = 1, Content = "chateîgne" };
+                var a = await manager.addAnswer(answerToAdd);
+                // 1) normal insertion
+                // WF : a is the same
+                // as answerToAdd
+                Assert.Equal(answerToAdd.Content, a.Content);
+                Assert.Equal(answerToAdd.Id, a.Id);
+
+                answerToAdd = new AnswerEntity { Id = 5, Content = "damien" };
+                a = await manager.addAnswer(answerToAdd);
+                // 2) with a random id greater than 0
+                // WF : 'a' content is equal to the
+                // content of 'answerToAdd'
+                // and since it's the second answer
+                // that we add, his id equal 2
+                Assert.Equal(answerToAdd.Content, a.Content);
+                Assert.Equal((uint)2, a.Id);
+
+                answerToAdd = new AnswerEntity { Id = 7, Content = "chateîgne" };
+                a = await manager.addAnswer(answerToAdd);
+                // 3) with a content that we already have added
+                // WF : the function return the answer which already
+                // have the same content so the content of 'a' is "châteigne"
+                // and his id is 1
+                Assert.Equal("chateîgne", a.Content);
+                Assert.Equal((uint)1, a.Id);
+
+                answerToAdd = new AnswerEntity { Id = 7, Content = "CHATEÎGNE" };
+                a = await manager.addAnswer(answerToAdd);
+                // 3) with a content that we already have added
+                // but in upperCase instead of lowerCase
+                // WF : the function return the answer which
+                // already have the same content so the content
+                // of 'a' is "chateîgne" and his id is 1
+                Assert.Equal("chateîgne", a.Content);
+                Assert.Equal((uint)1, a.Id);
+            }
         }
 
         /// <summary>
         /// test of the 'supprimerAnswer' method of an AnswerManager
         /// </summary>
         [Fact]
-        public async Task TestRemoveAnswer()
+        public async Task TestRemoveAnswerById()
         {
-            // remember that we have only 2 answers in the database :
-            // 1) (1, "châteigne")
-            // 2) (2, "damien")
-            var a = await mgr.removeAnswer(3);
-            // 1) with an id greater or equal
-            // to the number of element
-            // WF : it don't works so 'a' is null,
-            Assert.Null(a);
-
-            a = await mgr.removeAnswer(1);
-            // 1) with an id that belongs to an answer
-            // WF : it works so 'a' is not null,
-            // and since we've delete the answer with
-            // the id 1, the content is "châteigne"
-            Assert.NotNull(a);
-            Assert.Equal((uint)1, a.Id);
-            Assert.Equal("châteigne", a.Content);
-
-            a = await mgr.removeAnswer(2);
-            // 1) same thing with the id 1 just
-            // to clean the database
-            // WF : it works so 'a' is not null,
-            // and since we've delete the answer with
-            // the id 2, the content is "damien"
-            Assert.NotNull(a);
-            Assert.Equal((uint)2, a.Id);
-            Assert.Equal("damien", a.Content);
-
-            // now, the database should be clean
+            using (var context = new StubbedDbContext(opt))
+            {
+                await context.Database.EnsureCreatedAsync();
+                var mgr = new AnswerEntityManager(context);
+                // remember that we have only 2 answers in the database :
+                // 1) (1, "châteigne")
+                // 2) (2, "damien")
+                var a = await mgr.removeAnswer(3);
+                // 1) with an id greater or equal
+                // to the number of element
+                // WF : it don't works so 'a' is null,
+                Assert.Null(a);
+
+                a = await mgr.removeAnswer(1);
+                // 1) with an id that belongs to an answer
+                // WF : it works so 'a' is not null,
+                // and since we've delete the answer with
+                // the id 1, the content is "châteigne"
+                Assert.NotNull(a);
+                Assert.Equal((uint)1, a.Id);
+                Assert.Equal("châteigne", a.Content);
+
+                a = await mgr.removeAnswer(2);
+            }
         }
 
         // /!\ WARNING : since there was 2 answers added to the base,
@@ -104,19 +99,28 @@ namespace UnitTestsEntityManagers
         [Fact]
         public async Task TestGetNbElement()
         {
-            Assert.Equal(0, mgr.getNbElements()); // just to be sure
-
-            Assert.NotNull(fakeAnswers.datas); // just to be sure
-
-            int count = 0;
-            foreach (var answer in fakeAnswers.datas)
+            using (var context = new StubbedDbContext(opt))
             {
-                await mgr.addAnswer(answer);
-                count++;
-                Assert.Equal(count, mgr.getNbElements()); // ok, it's incremented
+                await context.Database.EnsureCreatedAsync();
+                var mgr = new AnswerEntityManager(context);
+                Assert.Equal(0, mgr.getNbElements()); // just to be sure
+
+                Assert.NotNull(fakeAnswers.datas); // just to be sure
+
+                int count = 0;
+                foreach (var answer in fakeAnswers.datas)
+                {
+                    await mgr.addAnswer(answer);
+                    count++;
+                    Assert.Equal(count, mgr.getNbElements()); // ok, it's incremented
+                }
             }
         }
 
+        /// <summary>
+        /// member data for the 'TestGetAnswer' test method
+        /// </summary>
+        /// <returns>a set of all inline datas for the test method</returns>
         public static IEnumerable<Object?[]> TestGetAnswer_Datas()
         {
             var datas = fakeAnswers.datas;
@@ -128,18 +132,122 @@ namespace UnitTestsEntityManagers
             }
             yield return new Object[] { max+1, null };
         }
+        /// <summary>
+        /// test of the 'getAnswer' method of an AnswerManager
+        /// </summary>
+        /// <param name="id">identifiant of the answer to get</param>
+        /// <param name="waiting">answer expected</param>
+        /// <returns>nothing but a Task</returns>
         [Theory]
         [MemberData(nameof(TestGetAnswer_Datas))]
         public async Task TestGetAnswer(uint id, AnswerEntity? waiting)
         {
-            var tmp = await mgr.getAnswer(id + 2);
-            Assert.Equal(waiting?.Content, tmp?.Content);
+            using (var context = new StubbedDbContext(opt))
+            {
+                await context.Database.EnsureCreatedAsync();
+                var mgr = new AnswerEntityManager(context);
+
+                var tmp = await mgr.getAnswer(id + 2);
+                Assert.Equal(waiting?.Content, tmp?.Content);
+            }
+        }
+
+        /// <summary>
+        /// member data for the 'TestGetAnswer' test method
+        /// </summary>
+        /// <returns>a set of all inline datas for the test method</returns>
+        public static IEnumerable<Object?[]> TestGetSomeAnswers_Datas()
+        {
+            var datas = fakeAnswers.datas;
+            var count = datas.Count();
+            // remind that to add answers, we haven't ordered this collection
+            // but we just have done a foreach
+
+            // 1 : 0 answer from the page 1 then, -1 answer from this page
+            // WF : count < 1 so we got null
+            yield return new object?[] { 1, 0, null };
+            yield return new object?[] { 1, -1, null };
+
+            // 2 : 1 answers from the page 0 then, 1 answers from the page -1
+            // WF : page < 1 so we got null
+            yield return new object?[] { 0, 1, null };
+            yield return new object?[] { -1, 1, null };
+
+            // 3 : 10 answers from the page 1
+            // WF : the first 10 element of datas
+            yield return new object?[] { 1, 10, datas.Take(10) };
+
+            // 4 : 10 elements from the page 1 order by id
+            // WF : the first 10 element of datas order by id
+            yield return new object?[] { 1, 10, datas.OrderBy(e => e.Id).Take(10), AnswerOrderCriteria.ById };
+
+            // 5 : 10 elements from the page 1 order by content
+            // WF : the first 10 element of datas order by content
+            yield return new object?[] { 1, 10, datas.OrderBy(e => e.Content).Take(10), AnswerOrderCriteria.ById };
+
+            // 6 : repeat 3, 4 and 5 with the page 2
+            // WF : the 10 next answer from each case
+            yield return new object?[] { 2, 10, datas.Skip(10).Take(10) };
+            yield return new object?[] { 1, 10, datas.OrderBy(e => e.Id).Skip(10).Take(10), AnswerOrderCriteria.ById };
+            yield return new object?[] { 1, 10, datas.OrderBy(e => e.Content).Skip(10).Take(10), AnswerOrderCriteria.ByContent };
+
+            // 7 : count/4 elements from the page 4
+            // WF : the lasts count/4 elements of datas
+            yield return new object?[] { 4, count / 4, datas.TakeLast(count / 4) };
+
+            // 8 : count/4 elements from the page 5
+            // WF : null since num (4) >= count / (count/4)
+            yield return new object?[] { 5, count / 4, null };
+
+            // 9 : 10 elements from the page 4
+            // WF : since there's only 31 elements in fake datas,
+            // we got the last element
+            yield return new object?[] { 4, 10, datas.TakeLast(1) };
         }
 
-        // modifierAnswer
+        /// <summary>
+        /// test of the 'getAnswer' method of an AnswerManager
+        /// </summary>
+        /// <param name="num">the page number</param>
+        /// <param name="count">page elements number</param>
+        /// <param name="waiting">set of answers expected</param>
+        /// <param name="orderCriteria">the order criteria</param>
+        /// <returns>nothing but a Task</returns>
+        [Theory]
+        [MemberData(nameof(TestGetSomeAnswers_Datas))]
+        public async Task TestGetSomeAnswers(int num, int count, IEnumerable<AnswerEntity>? waiting, AnswerOrderCriteria orderCriteria = AnswerOrderCriteria.ById)
+        {
+
+            using (var context = new StubbedDbContext(opt))
+            {
+                await context.Database.EnsureCreatedAsync();
+                var mgr = new AnswerEntityManager(context);
+
+                var nbPages = count == 0 ? -1 : mgr.getNbElements() / count;
+                var tmp = await mgr.getAnswers(num, count, orderCriteria);
+
+                Assert.Equal(nbPages, tmp.nbPages);
+                if (waiting == null) Assert.Null(tmp.answers);
+                else
+                {
+                    Assert.NotNull(tmp.answers);
+                    if (waiting.Count() == 0) Assert.Empty(tmp.answers);
+                    else
+                    {
+                        for (var i = 0; i < count; i++)
+                        {
+                            var e1 = waiting.ElementAt(i);
+                            var e2 = tmp.answers.ElementAt(i);
+                            Assert.Equal(e1.Content, e2.Content);
+                            Assert.Equal(e2.IdQuestion, e1.IdQuestion);
+                        }
+                    }
+                }
+            }
+        }
 
-        // supprimerAnswer (les 2)
+        // removeAnswer by element
 
-        // getAnswersByIdQuestion
+        // updateAnswer
     }
 }
\ No newline at end of file
diff --git a/WebApi/UnitTestsEntityManagers/UnitTestsEntityManagers.csproj b/WebApi/UnitTestsEntityManagers/UnitTestsEntityManagers.csproj
index 2989bdb..3e3ee01 100644
--- a/WebApi/UnitTestsEntityManagers/UnitTestsEntityManagers.csproj
+++ b/WebApi/UnitTestsEntityManagers/UnitTestsEntityManagers.csproj
@@ -22,6 +22,7 @@
     <ProjectReference Include="..\Entities\Entities.csproj" />
     <ProjectReference Include="..\EntityManagers\EntityManagers.csproj" />
     <ProjectReference Include="..\FakeDatas\FakeDatas.csproj" />
+    <ProjectReference Include="..\StubbedDbContextLibrary\StubbedDbContextLibrary.csproj" />
   </ItemGroup>
 
   <ItemGroup>