working on region clearing cache, if using cachemanager back plance this would clear all servers in cluster

test/Ocelot.UnitTests/Controllers/OutputCacheControllerTests.cs

@@ -0,0 +1,70 @@
+using Xunit;
+using Shouldly;
+using TestStack.BDDfy;
+using Ocelot.Controllers;
+using System;
+using Moq;
+using Ocelot.Cache;
+using System.Net.Http;
+using System.Collections.Generic;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Ocelot.UnitTests.Controllers
+{
+    public class OutputCacheControllerTests
+    {
+        private OutputCacheController _controller;
+        private Mock<IOcelotCache<HttpResponseMessage>> _cache;
+        private IActionResult _result;
+
+        public OutputCacheControllerTests()
+        {
+            _cache = new Mock<IOcelotCache<HttpResponseMessage>>();
+            _controller = new OutputCacheController(_cache.Object);
+        }
+
+        [Fact]
+        public void should_get_all_keys_from_server()
+        {
+            this.Given(_ => GivenTheFollowingKeys(new List<string>{"b", "a"}))
+                .When(_ => WhenIGetTheKeys())
+                .Then(_ => ThenTheKeysAreReturned())
+                .BDDfy();
+        }
+
+        [Fact]
+        public void should_delete_key()
+        {
+             this.When(_ => WhenIDeleteTheKey("a"))
+                .Then(_ => ThenTheKeyIsDeleted("a"))
+                .BDDfy();
+        }
+
+        private void ThenTheKeyIsDeleted(string key)
+        {
+            _result.ShouldBeOfType<NoContentResult>();
+            _cache
+                .Verify(x => x.ClearRegion(key), Times.Once);
+        }
+
+        private void WhenIDeleteTheKey(string key)
+        {
+            _result = _controller.Delete(key);
+        }
+
+        private void GivenTheFollowingKeys(List<string> keys)
+        {
+            
+        }
+
+        private void WhenIGetTheKeys()
+        {
+            _result = _controller.Get();
+        }
+
+        private void ThenTheKeysAreReturned()
+        {
+            _result.ShouldBeOfType<OkObjectResult>();
+        }
+    }
+}