Rewire LoadBalancerFactory to allow injecting custom load balancers, by introducing LoadBalancerCreators

test/Ocelot.UnitTests/LoadBalancer/RoundRobinCreatorTests.cs

@@ -0,0 +1,72 @@
+using Moq;
+using Ocelot.Configuration;
+using Ocelot.Configuration.Builder;
+using Ocelot.LoadBalancer.LoadBalancers;
+using Ocelot.ServiceDiscovery.Providers;
+using Shouldly;
+using TestStack.BDDfy;
+using Xunit;
+
+namespace Ocelot.UnitTests.LoadBalancer
+{
+    public class RoundRobinCreatorTests
+    {
+        private readonly RoundRobinCreator _creator;
+        private readonly Mock<IServiceDiscoveryProvider> _serviceProvider;
+        private DownstreamReRoute _reRoute;
+        private ILoadBalancer _loadBalancer;
+        private string _typeName;
+
+        public RoundRobinCreatorTests()
+        {
+            _creator = new RoundRobinCreator();
+            _serviceProvider = new Mock<IServiceDiscoveryProvider>();
+        }
+        
+        [Fact]
+        public void should_return_expected_name()
+        {
+            var reRoute = new DownstreamReRouteBuilder()
+                .Build();
+
+            this.Given(x => x.GivenAReRoute(reRoute))
+                .When(x => x.WhenIGetTheLoadBalancer())
+                .Then(x => x.ThenTheLoadBalancerIsReturned<RoundRobin>())
+                .BDDfy();
+        }
+                
+        [Fact]
+        public void should_return_instance_of_expected_load_balancer_type()
+        {
+            this.When(x => x.WhenIGetTheLoadBalancerTypeName())
+                .Then(x => x.ThenTheLoadBalancerTypeIs("RoundRobin"))
+                .BDDfy();
+        }
+
+        private void GivenAReRoute(DownstreamReRoute reRoute)
+        {
+            _reRoute = reRoute;
+        }
+
+        private void WhenIGetTheLoadBalancer()
+        {
+            _loadBalancer = _creator.Create(_reRoute, _serviceProvider.Object);
+        }
+        
+        private void WhenIGetTheLoadBalancerTypeName()
+        {
+            _typeName = _creator.Type;
+        }
+
+        private void ThenTheLoadBalancerIsReturned<T>()
+            where T : ILoadBalancer
+        {
+            _loadBalancer.ShouldBeOfType<T>();
+        }
+
+        private void ThenTheLoadBalancerTypeIs(string type)
+        {
+            _typeName.ShouldBe(type);
+        }
+    }
+}