nice refactorings

PracticeCalendar.UnitTests/Integration/ServiceCollectionExtensions.cs

@@ -0,0 +1,20 @@
+using Microsoft.Extensions.DependencyInjection;
+
+namespace PracticeCalendar.UnitTests.Integration
+{
+    public static class ServiceCollectionExtensions
+    {
+        public static IServiceCollection Remove<TService>(this IServiceCollection services)
+        {
+            var serviceDescriptor = services.FirstOrDefault(d =>
+                d.ServiceType == typeof(TService));
+
+            if (serviceDescriptor != null)
+            {
+                services.Remove(serviceDescriptor);
+            }
+
+            return services;
+        }
+    }
+}