Build test host using given app config file

test/isnd.tests/UnitTestWebHost.cs

@@ -13,7 +13,6 @@ namespace isnd.host.tests
 {
     public class UnitTestWebHost
     {
-        const string testingUrl = "http://localhost:5000";
         [Fact]
 
 
@@ -21,7 +20,7 @@ namespace isnd.host.tests
         {
             string envVar = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
             
-            IWebHost webhost = BuildWebHost(new string[] { "--urls", testingUrl });
+            IWebHost webhost = BuildWebHost(new string[0]);
 
             using (var serviceScope = webhost.Services.CreateScope())
             {