AspNetCore.TestHost dependency injection in the controller returns 500 errors

Question

AspNetCore.TestHost dependency injection in the controller returns 500 errors

I want to run a test server to host my main asp.net api application using AspNetCore.TestHost and run some tests using nUnit. So here are the parts:

Controller bit:

[Route("api/[controller]")]
public class SurveyController : Controller
{
    [HttpGet("{surveyId}")]
    public async Task<IActionResult> GetSurvey(int surveyId)
    {
        var entity = await _repository.GetEntity(surveyId);

        if (entity==null)
            return NotFound();

        return Ok(entity);
    }
}

I send surveyId = 0. If I check that in the browser or postman I get 404 Not Found - excellent. However, when I run the test, I get 200 Ok, and I return to the default route from the launch class, which looks like this:

    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        //this one ignored in tests but works fine in postman
        app.UseMvc();

        //i get this response for some reason
        app.Run(async (context) =>
        {
            await context.Response.WriteAsync("MVC didn't find anything to route to!");
        });


    }

So, here are my test implications. Context

public class TestContext
{
    private TestServer _server; 

    public HttpClient Client {  

        get;  
        private set;  
    }

    public TestContext()
    {
        SetUpClient();
    }

    private void SetUpClient() 
    {  
        _server = new TestServer(new WebHostBuilder().UseStartup < Startup > ());  
        Client = _server.CreateClient();  
    }  
}

Test

    [Test]
    public async Task GetSurveyDb_NullReturn_ReturnNotFound()
    {  

        var response = await _sut.Client.GetAsync(":5000/api/survey/0");  
        //response.EnsureSuccessStatusCode();
        var result = response.StatusCode;
        var wtf= await response.Content.ReadAsStringAsync();
        var expected = System.Net.HttpStatusCode.NotFound;

        Assert.That(result, Is.EqualTo(expected));
    }

: 5000/api/survey/0, , . : 5000, 500, http://localhost

, , . - ? .

1 , , . , .

    private readonly IBoatInspectorRepository<Survey> _repository;

    public SurveyController(IBoatInspectorRepository<Survey> repository)
    {
        _repository = repository;
    }

:

 public void ConfigureServices(IServiceCollection services)
    {

        services.AddScoped<IBoatInspectorRepository<Survey>, BoatInspectorRepository<Survey>>();
        services.AddMvc();

        services.AddEntityFrameworkNpgsql()
            .AddDbContext<BoatInspectorContext>(
                opt=>opt.UseNpgsql(Configuration.GetConnectionString("BoatInspectorConnectionString")));
    }

, ... , , .

2

, . . :

    private readonly IBoatInspectorRepository<Survey> _repository;

    public SurveyController()
    {

    }

    public SurveyController(IBoatInspectorRepository<Survey> repository)
    {
        _repository = repository;
    }