ASP.NET Core UseSetting from Integration Test

Question

I have an integration test project that uses .UseSetting()in a test class as follows:

public AccessTokenRetrieval() : base(nameof(AccessTokenRetrieval))
{
    var connectionString = GetConnectionString();
    var dbSettings = new DbSettings(connectionString);
    _userGroupRepository = new UserGroupRepository(dbSettings);
    _roleRepository = new RoleRepository(dbSettings);
    _userRepository = new UserRepository(dbSettings);

    _server = new TestServer(new WebHostBuilder()
        .UseStartup<Startup>()
        .UseEnvironment("IntegrationTest")
        .UseSetting("IntegrationTestConnString", dbSettings.IdentityServerConnectionString));
    _handler = _server.CreateHandler();
    _client = _server.CreateClient();
}

Now I would like to get this setting in Startup.cs of my actual project. I tried to do this using:

public void ConfigureIntegrationTestServices(IServiceCollection services)
{
    var connectionString = Configuration.GetValue<string>("IntegrationTestConnString");

    BuildIdentityServerTests(services, connectionString);
    AddCoreServices(services, connectionString);
}

but it seems to return null.

What is the correct way to get this parameter?

Answer 1

Setup for each test

To pass a parameter to a specific instance TestHost, you can use the ConfigureServicescall and override the default registration.

, DbSettings Startup.ConfigureServices. TryAll:

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.TryAddSingleton(new DbSettings(...));
    }
}

WebHostBuilder.ConfigureServices:

_server = new TestServer(new WebHostBuilder()
    .UseStartup<Startup>()
    .ConfigureServices(services =>
        {
            services.AddSingleton(new DbSettings(...));
        }
    );

DbSettings , . WebHostBuilder.ConfigureServices , TryAdd .

DI.

( ), UseSetting , ,

Environment.SetEnvironmentVariable("foo", "bar");

var _server = new TestServer(new WebHostBuilder()
    .UseStartup<Startup>()
);

:

public void ConfigureServices(IServiceCollection services)
{
    string setting1 = Configuration["foo"];
    string setting2 = Environment.GetEnvironmentVariable("foo");
}

Configuration:

public Startup(IHostingEnvironment env)
{
    var builder = new ConfigurationBuilder()
        .SetBasePath(env.ContentRootPath)
        .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)

        //this config provider is mandatory to read env vars from Configuration
        .AddEnvironmentVariables();

    Configuration = builder.Build();
}

Answer 2

IConfigurationRoot, . , , ( appsetting.local.json , CI).

var configuration = new ConfigurationBuilder()
    .SetBasePath(AppContext.BaseDirectory)
    .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
    .AddJsonFile("appsettings.local.json", optional: true, reloadOnChange: true)
    .AddInMemoryCollection(new Dictionary<string, string>
    {
        {"myConfig:setting1", "value1"},
        {"myConfig:setting2", "value2"}
    })
    .Build();

var server = new TestServer(new WebHostBuilder()
    .UseUrls("http://localhost:5001")
    .UseContentRoot(Directory.GetCurrentDirectory())
    .UseStartup<Startup>()
    .ConfigureServices(services => services.AddSingleton(configuration)));

:

public class Startup
{
    public Startup(IConfigurationRoot configuration)
    {
        this.Configuration = configuration;
    }

    ...
}

Edit: , , -, IOptionsSnapshot . , , , , test/fixture.