Fix content type double registration.

Author: tusmester

src/SenseNet.Client.Tests/UnitTests/RepositoryTests.cs

@@ -21,6 +21,13 @@ namespace SenseNet.Client.Tests.UnitTests
     [TestClass]
     public class RepositoryTests : TestBase
     {
+        #region Test classes
+        public class File : Content
+        {
+            public File(IRestCaller restCaller, ILogger<Content> logger) : base(restCaller, logger) { }
+        }
+        #endregion
+
         private const string ExampleUrl = "https://example.com";
 
         [TestMethod]
@@ -1085,6 +1092,26 @@ public async Task Repository_T_RegisterContentTypes_DifferentTypeSameName()
             Assert.IsNotNull(services.GetService<DifferentNamespace.MyContent>());
         }
 
+        [TestMethod]
+        public async Task Repository_T_RegisterGlobalContentType_OverrideExisting()
+        {
+            // ACTION
+            var repositories = GetRepositoryCollection(services =>
+            {
+                services.RegisterGlobalContentType(typeof(DownloadTests.File));
+
+                // override the registration above
+                services.RegisterGlobalContentType(typeof(File));
+            });
+
+            // ASSERT
+            var repository = await repositories.GetRepositoryAsync(CancellationToken.None)
+                .ConfigureAwait(false);
+            repository.GlobalContentTypes.ContentTypes.TryGetValue("File", out var contentType);
+            Assert.IsNotNull(contentType);
+            Assert.AreEqual(typeof(File), contentType);
+        }
+
         /* =================================================================== CREATE REGISTERED CONTENT */
 
         [TestMethod]

src/SenseNet.Client/RepositoryExtensions.cs

@@ -108,7 +108,7 @@ public static IServiceCollection RegisterGlobalContentType(this IServiceCollecti
         services.AddTransient(contentType, contentType);
         services.Configure<RegisteredContentTypes>(contentTypes =>
         {
-            contentTypes.ContentTypes.Add(contentTypeName ?? contentType.Name, contentType);
+            contentTypes.Add(contentType, contentTypeName);
         });
         return services;
     }
@@ -124,7 +124,7 @@ public static IServiceCollection RegisterGlobalContentType<T>(this IServiceColle
         services.AddTransient<T, T>();
         services.Configure<RegisteredContentTypes>(contentTypes =>
         {
-            contentTypes.ContentTypes.Add(contentTypeName ?? typeof(T).Name, typeof(T));
+            contentTypes.Add<T>(contentTypeName);
         });
         return services;
     }