Unit tests for ASP.NET Core failing in VSTS pipeline due to HttpStatusCode.TemporaryRedirect - unit-testing

Question

I have an ASP.NET Core 2.2 WebAPI that uses xUnit and FluentAssertions frameworks. It creates a Microsoft.AspNetCore.TestHost.TestServer and from that server object we create an HttpClient using Microsoft.AspNetCore.TestHost.TestServer.CreateClient() API.
The unit tests work great on my local Windows 10 machine using Visual Studio 2017 Pro. I committed the code, then did a pull request. The pull request automatically kicks off a build process to ensure it builds. Once it builds, it looks for then runs the unit tests. At this point it fails. I have 242 unit tests. All 242 unit test fail with the exact same error reported by the agent:
Expected resp.StatusCode to be OK, but found TemporaryRedirect.
All 242 unit tests make a request to the test server, so they all expect an HttpStatusCode.OK (or similarly expected) response. I should never expect a HttpStatuscode.TemporaryRedirect so I really don't want to add a test case for this.
The build server is running in VSTS as Microsoft Server 2012 R2 with Visual Studio 2017 Pro installed.
Why would the TestServer object return a Redirect ever?
If there is no way around this, can I force the HttpClient to auto-redirect when it receives this status so I only get the result of the API call?
Here is the code I am using to create the server and the client:
var config = new ConfigurationBuilder()
.SetBasePath(Path.GetFullPath("../../../../XXXXXXXXService/"))
.AddJsonFile("appsettings.json", optional: false)
.Build();
_server = new TestServer(new WebHostBuilder().UseStartup<Startup>().UseConfiguration(config));
TestHttpClient = _server.CreateClient();
An example unit test that is failing:
private string DeriveHttpPath(string path) =>
$"/{_rootPath.Trim('/')}/{path.TrimStart('/')}";
private static async Task<TResult> ValidateAndReadResponseAsync<TResult>(
HttpResponseMessage resp, HttpStatusCode statusShouldBe, Func<TResult> defFactory = null)
{
(resp.IsSuccessStatusCode ? HttpStatusCode.OK : resp.StatusCode).Should().Be(statusShouldBe);
try
{
return await resp.Content.ReadAsAsync<TResult>();
}
catch (Exception ex)
{
return defFactory != null ? defFactory.Invoke() : throw ex;
}
}
public async Task<TResult> GetDocumentDataAsync<TResult>(string documentId,
string path = null, HttpStatusCode statusShouldBe = HttpStatusCode.OK)
{
using (var msg = new HttpRequestMessage(HttpMethod.Get,
DeriveHttpPath($"{_collectionId}/{documentId}?path={path}")))
using (var resp = await _httpClient.SendAsync(msg))
{
return await ValidateAndReadResponseAsync<TResult>(resp, statusShouldBe);
}
}
_rootPath will be the root of the controller, i.e.: /api/MyController
Thank you for any help.

Answer 1

The issue I was having was because this was defined in the startup.cs:
#if !DEBUG
app.UseHttpsRedirection();
#endif
So when I was running the unit tests locally, it was compiled as Debug, where when it was pushed to the build server, it compiled as Release and the Https-Redirection was turned on.
I took that code out and made my WebAPI HTTPS-Only by setting it in Azure.