Add some unit test for stubs

Sources/TestUnitaires/TU_StubCustomTitle.cs

@@ -0,0 +1,33 @@
+using Model;
+using Model.Stub;
+using Newtonsoft.Json.Linq;
+using NuGet.Frameworks;
+using System.Collections.ObjectModel;
+
+namespace TestUnitaires
+{
+
+    public class TU_StubCustomTitle
+    {
+        [Theory]
+        [InlineData("test")]
+        public void TU_Methods(string test)
+        {
+            StubCustomTitle sct = new StubCustomTitle();
+            List<CustomTitle> list = new List<CustomTitle>();
+            List<string> list2 = new List<string>() { "MaMusique" };
+            Artist artist = new Artist("Un mec");
+            ObservableCollection<CustomTitle> collec = new ObservableCollection<CustomTitle>();
+            CustomTitle cust = new CustomTitle("Morceau de test", "mp3.pdf", "plein d'infos", "avec un petit chemin");
+            list = sct.GetCustomTitlesByNames(list2).ToList();
+            Assert.NotEmpty(list);
+            sct.AddCustomTitle(cust);
+            Assert.Contains(cust, sct.CustomTitles);
+            sct.RemoveCustomTitle(cust);
+            Assert.DoesNotContain(cust, sct.CustomTitles);
+            collec = sct.GetCustomTitles();
+            Assert.Equal(sct.CustomTitles, collec); 
+        }
+    }
+
+}