SpeckleHttp coverage (#244)

* Show code coverage for dev

* SpeckleHttp coverage and moved base stuff around

* add SpeckleHttpTests

src/Speckle.Sdk/Helpers/SpeckleHttp.cs

@@ -15,10 +15,15 @@ public class SpeckleHttp(ILogger<SpeckleHttp> logger, ISpeckleHttpClientHandlerF
   /// <param name="uri">The URI that should be pinged</param>
   /// <exception cref="System.Net.Http.HttpRequestException">Request to <paramref name="uri"/> failed</exception>
   public async Task<HttpResponseMessage> HttpPing(Uri uri)
+  {
+    using var httpClient = CreateHttpClient();
+    return await HttpPing(uri, httpClient).ConfigureAwait(false);
+  }
+
+  public async Task<HttpResponseMessage> HttpPing(Uri uri, HttpClient httpClient)
   {
     try
     {
-      using var httpClient = CreateHttpClient();
       HttpResponseMessage response = await httpClient.GetAsync(uri).ConfigureAwait(false);
       response.EnsureSuccessStatusCode();
       logger.LogInformation("Successfully pinged {uri}", uri);