Added base url finder for when nothing set in Program.cs

test/Ocelot.UnitTests/Middleware/BaseUrlFinderTests.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Hosting;
+using Moq;
+using Ocelot.Middleware;
+using Shouldly;
+using TestStack.BDDfy;
+using Xunit;
+
+namespace Ocelot.UnitTests.Middleware
+{
+    public class BaseUrlFinderTests
+    {
+        private readonly BaseUrlFinder _baseUrlFinder;
+        private readonly Mock<IWebHostBuilder> _webHostBuilder;
+        private string _result;
+
+        public BaseUrlFinderTests()
+        {
+            _webHostBuilder = new Mock<IWebHostBuilder>();
+            _baseUrlFinder = new BaseUrlFinder(_webHostBuilder.Object);
+        }
+
+        [Fact]
+        public void should_find_base_url_based_on_webhostbuilder()
+        {
+            this.Given(x => GivenTheWebHostBuilderReturns("http://localhost:7000"))
+                .When(x => WhenIFindTheUrl())
+                .Then(x => ThenTheUrlIs("http://localhost:7000"))
+                .BDDfy();
+        }
+
+        [Fact]
+        public void should_use_default_base_url()
+        {
+            this.Given(x => GivenTheWebHostBuilderReturns(""))
+              .When(x => WhenIFindTheUrl())
+              .Then(x => ThenTheUrlIs("http://localhost:5000"))
+              .BDDfy();
+        }
+
+        private void GivenTheWebHostBuilderReturns(string url)
+        {
+            _webHostBuilder
+                .Setup(x => x.GetSetting(WebHostDefaults.ServerUrlsKey))
+                .Returns(url);
+        }
+
+        private void WhenIFindTheUrl()
+        {
+            _result = _baseUrlFinder.Find();
+        }
+
+        private void ThenTheUrlIs(string expected)
+        {
+            _result.ShouldBe(expected);
+        }
+    }
+}