Made all services required (closes #161)

Author: ivaylokenov

src/MyTested.AspNetCore.Mvc.Caching/HttpTestContextCachingExtensions.cs

@@ -9,7 +9,7 @@
     public static class HttpTestContextCachingExtensions
     {
         public static IMemoryCache GetMemoryCache(this HttpTestContext testContext)
-            => testContext.HttpContext.RequestServices.GetService<IMemoryCache>();
+            => testContext.HttpContext.RequestServices.GetRequiredService<IMemoryCache>();
 
         internal static IMockedMemoryCache GetMockedMemoryCache(this HttpTestContext testContext)
             => testContext.GetMemoryCache().AsMockedMemoryCache();

src/MyTested.AspNetCore.Mvc.Core/Builders/Controllers/ControllerBuilder.cs

@@ -101,7 +101,7 @@ public IControllerTestBuilder ShouldHave()
 
         private void ValidateControllerType()
         {
-            var validControllers = this.Services.GetService<IValidControllersCache>();
+            var validControllers = this.Services.GetRequiredService<IValidControllersCache>();
             var controllerType = typeof(TController);
             if (!validControllers.IsValid(typeof(TController)))
             {

src/MyTested.AspNetCore.Mvc.Core/Builders/Controllers/ControllerServiceBuilder.cs

@@ -20,7 +20,7 @@ public IAndControllerBuilder<TController> WithServiceSetupFor<TService>(Action<T
             CommonValidator.CheckForNullReference(scopedServiceSetup, nameof(scopedServiceSetup));
             ServiceValidator.ValidateScopedServiceLifetime<TService>(nameof(WithServiceSetupFor));
 
-            scopedServiceSetup(this.HttpContext.RequestServices.GetService<TService>());
+            scopedServiceSetup(this.HttpContext.RequestServices.GetRequiredService<TService>());
 
             return this;
         }