add router injection test

Author: jaredcnance

JsonApiDotNetCoreTests/Extensions/Class1.cs

@@ -0,0 +1,26 @@
+using Xunit;
+using JsonApiDotNetCore.Routing;
+using JsonApiDotNetCore.Extensions;
+using JsonApiDotNetCoreTests.Helpers;
+
+namespace JsonApiDotNetCoreTests.Extensions.UnitTests
+{
+    // see example explanation on xUnit.net website:
+    // https://xunit.github.io/docs/getting-started-dotnet-core.html
+    public class IServiceCollectionExtensionsTests
+    {
+        [Fact]
+        public void AddJsonApi_AddsRouterToServiceCollection()
+        {
+            // arrange
+            var serviceCollection = new ServiceCollection();
+
+            // act
+            serviceCollection.AddJsonApi(config => {});
+
+            // assert
+            Assert.True(serviceCollection.ContainsType(typeof(Router)));
+        }
+
+    }
+}

JsonApiDotNetCoreTests/Extensions/IServiceCollectionExtensionsTests.cs

@@ -1,3 +1,5 @@
+using System;
+using System.Linq;
 using System.Collections;
 using System.Collections.Generic;
 using Microsoft.Extensions.DependencyInjection;
@@ -10,5 +12,17 @@ IEnumerator IEnumerable.GetEnumerator()
     {
       return GetEnumerator();
     }
+
+    public bool ContainsType(Type type)
+    {
+      var ret = false;
+      this.ForEach(sD => {
+        if(sD.ServiceType == type)
+        {
+          ret = true;
+        }
+      });
+      return ret;
+    }
   }
 }