Merge pull request #575 from Amleto/gh-issue-574

Add failing test for Gh issue #574

Author: dadhi

test/DryIoc.IssuesTests/GHIssue574_Cannot_register_multiple_impls_in_child_container_with_default_service_key.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using Microsoft.Extensions.DependencyInjection;
+using DryIoc.Microsoft.DependencyInjection;
+
+namespace DryIoc.IssuesTests
+{
+    public class GHIssue574_Cannot_register_multiple_impls_in_child_container_with_default_service_key
+    {
+        [Ignore("fixme")]
+        public void ResolveEnumerableFromChild()
+        {
+            var services = new ServiceCollection();
+
+            services.AddScoped<IPrinter, Printer>();
+            services.AddScoped<IPrinter, PrinterA>();
+            services.AddScoped<IPrinter, PrinterB>();
+            services.AddScoped<IPrinter, NeighborPrinter>();
+
+            var spf = new DryIocServiceProviderFactory();
+            var rootContainer = spf.CreateBuilder(new ServiceCollection());
+            var childContainer = rootContainer.CreateChild(RegistrySharing.Share, "child-stamp", IfAlreadyRegistered.AppendNewImplementation);
+
+            //childContainer.Populate(services);
+            foreach (var service in services)
+            {
+                childContainer.RegisterDescriptor(service, IfAlreadyRegistered.AppendNewImplementation, "child-stamp");
+            }
+
+            var msContainer = childContainer.GetServiceProvider();
+
+            Assert.That(
+                childContainer.Resolve<IEnumerable<IPrinter>>().Count(),
+                Is.EqualTo(msContainer.GetRequiredService<IEnumerable<IPrinter>>().Count()));
+
+            Assert.That(
+                msContainer.GetRequiredService<IEnumerable<IPrinter>>().Count(),
+                Is.EqualTo(4));
+        }
+
+        private interface IPrinter { }
+
+        private class Printer : IPrinter { }
+
+        private class PrinterA : IPrinter { }
+
+        private class PrinterB : IPrinter { }
+
+        private class NeighborPrinter : IPrinter { }
+    }
+}