Fix build warnings

Author: alexmg

test/Autofac.Specification.Test/Registration/AssemblyScanningPerformanceTests.cs

@@ -1,33 +1,31 @@
+using System.Diagnostics;
+using System.Globalization;
+using Xunit;
+using Xunit.Abstractions;
+
 namespace Autofac.Specification.Test.Registration
 {
-    using System.Diagnostics;
-    using Xunit;
-    using Xunit.Abstractions;
-
     public class AssemblyScanningPerformanceTests
     {
-        private readonly ITestOutputHelper output;
+        private readonly ITestOutputHelper _output;
 
-        public AssemblyScanningPerformanceTests(ITestOutputHelper output)
-        {
-            this.output = output;
-        }
+        public AssemblyScanningPerformanceTests(ITestOutputHelper output) => _output = output;
 
         [Fact]
         public void MeasurePerformance()
         {
             var builder = new ContainerBuilder();
             for (var i = 0; i < 1000; i++)
             {
-                //just to simulate a lot of "scanning" with few (in this case zero) "hits"
+                // Just to simulate a lot of "scanning" with few (in this case zero) "hits"
                 builder.RegisterAssemblyTypes(GetType().Assembly).Where(x => false);
             }
 
             var stopwatch = Stopwatch.StartNew();
             builder.Build().Dispose();
 
-            //after fix drops from ~500ms to ~100ms
-            output.WriteLine(stopwatch.Elapsed.TotalMilliseconds.ToString());
+            // After fix drops from ~500ms to ~100ms
+            _output.WriteLine(stopwatch.Elapsed.TotalMilliseconds.ToString(CultureInfo.InvariantCulture));
         }
     }
 }

test/Autofac.Test/Features/OpenGenerics/ComplexGenericsTests.cs

@@ -341,7 +341,6 @@ public void ResolveTypeFromOpenGenericInterfaceTypeParameterIsInterfaceWithConst
             var instance = container.Resolve<INested<ISimpleInterface>>();
         }
 
-
         private class CNestedSimpleInterface : INested<ISimpleInterface>
         {
         }