Unit testing an external HTTP request in .NET

Question

I have the following method:

 private async Task<Result> TryGetResult (string request) { var httpClient = new HttpClient(); var result = await httpClient.GetAsync(request); if (result.IsSuccess) { var body = await result.Content.ReadAsStringAsync(); var deserializedResult = JsonConvert.DeserializeObject<Result>(body); return deserializedResult ; } if ( result.StatusCode == (HttpStatusCode)429 ) { await Task.Delay(TimeSpan.FromSeconds(1)); return await TryGetResult(request); } }

This takes in this string request: var request = $"https://atlas.microsoft.com/search/address/json ... //(private keys omitted)

I want to unit test the method and stub out the request so that I don't make a real call. I have limited experience unit testing C# and am struggling to work out how to stub this? Please can anyone point me in the right direction?

I have tried looking at similar articles and googling but cannot find the stubbing of a string request like this and wonder if I'm going in the wrong direction with trying to test?

Daniel A. White · Accepted Answer · 2020-07-13 16:40:13Z

You should allow for injection of a HttpClient from the constructor of the class containing TryGetResult

public class YourClass // might want to implement IDisposable? { private readonly HttpClient _client; public YourClass() : this(new HttpClient()); { } public YourClass(HttpClient client) { _client = client ?? throw new ArgumentNullException(nameof(client)); } }

From there, I would suggest mocking the HttpClient with RichardSzalay.MockHttp. That way you can control the full response.

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