Cleanup where/when OpenStackNet.Configure is called

It should only be called automatically when the config is accessed,
manually by the calling application and by HttpTest.

Author: carolynvs

src/corelib/Testing/HttpTest.cs

@@ -1,7 +1,10 @@
 using System;
+using System.Net;
 using System.Net.Http;
 using Flurl;
+using Flurl.Http;
 using Flurl.Http.Configuration;
+using Flurl.Http.Content;
 using OpenStack.Authentication;
 
 namespace OpenStack.Testing
@@ -31,6 +34,7 @@ public HttpTest(Action<FlurlHttpSettings> configureFlurl = null, Action<OpenStac
                     CallLog.Add(call);
                 };
             };
+            OpenStackNet.ResetDefaults();
             OpenStackNet.Configure(setFlurlTestMode, configure);
         }
 
@@ -41,6 +45,23 @@ public HttpTest(Action<FlurlHttpSettings> configureFlurl = null, Action<OpenStac
             base.Dispose();
         }
 
+        /// <inheritdoc />
+        public new HttpTest RespondWithJson(object data)
+        {
+            return RespondWithJson(200, data);
+        }
+
+        /// <inheritdoc />
+        public new HttpTest RespondWithJson(int status, object data)
+        {
+            ResponseQueue.Enqueue(new HttpResponseMessage
+            {
+                StatusCode = (HttpStatusCode)status,
+                Content = new CapturedJsonContent(OpenStackNet.Configuration.FlurlHttpSettings.JsonSerializer.Serialize(data))
+            });
+            return this;
+        }
+
         class TestHttpClientFactory : IHttpClientFactory
         {
             private readonly Flurl.Http.Testing.TestHttpClientFactory _testMessageHandler;

src/testing/unit/OpenStackNetTests.cs

@@ -18,14 +18,11 @@ public OpenStackNetTests(ITestOutputHelper testLog)
         {
             var testOutput = new XunitTraceListener(testLog);
             Trace.Listeners.Add(testOutput);
-
-            OpenStackNet.ResetDefaults();
         }
 
         public void Dispose()
         {
             OpenStackNet.ResetDefaults();
-            OpenStackNet.Configure();
         }
 
         [Fact]

src/testing/unit/Serialization/EmptyEnumerableTests.cs

@@ -20,7 +20,6 @@ public ExampleThing()
         [Fact]
         public void WhenDeserializingNullCollection_ItShouldUseAnEmptyCollection()
         {
-            OpenStackNet.Configure();
             var thing = new ExampleThing{Messages = null};
             string json = OpenStackNet.Configuration.FlurlHttpSettings.JsonSerializer.Serialize(thing);
             Assert.DoesNotContain("messages", json);
@@ -34,7 +33,6 @@ public void WhenDeserializingNullCollection_ItShouldUseAnEmptyCollection()
         [Fact]
         public void WhenSerializingEmptyCollection_ItShouldBeIgnored()
         {
-            OpenStackNet.Configure();
             var thing = new ExampleThing { Messages = new List<string>() };
 
             string json = OpenStackNet.Configuration.FlurlHttpSettings.JsonSerializer.Serialize(thing);

src/testing/unit/Serialization/RootWrapperConverterTests.cs

@@ -19,12 +19,7 @@ class Thing
         class ThingCollection : List<Thing>
         {
         }
-
-        public RootWrapperConverterTests()
-        {
-            OpenStackNet.Configure();            
-        }
-
+        
         [Fact]
         public void Serialize()
         {