Retrieving connection string in integration test - integration-testing

Question

I am trying to do some integration tests for my asp.net Core 2.1 project.
I initialise on startup file my connection string but when i run the test it still empty in handler, what is wrong on my code?
[TestMethod]
public async Task Method1()
{
var webHostBuilder = new WebHostBuilder()
.UseEnvironment("Development")
.UseStartup<Startup>();
HttpRequestMessage getRequest = new HttpRequestMessage(HttpMethod.Get, "api/action")
{
};
getRequest.Headers.Add("userId", "4622");
getRequest.Headers.Add("clientId", "889");
using (var server = new TestServer(webHostBuilder))
using (var client = server.CreateClient())
{
var result = await client.SendAsync(getRequest);
...
}
}
Startup
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
public void ConfigureServices(IServiceCollection services)
{
...
services.Configure<SqlConfig>(options =>
{
options.ConnectionString = Configuration.GetConnectionString("DefaultConnection");
});
...
}
SqlConfig
public class SqlConfig
{
public string ConnectionString { get; set; }
}
Repository
public abstract class SqlServerQueryHandler<TQuery, TResult> : BaseQueryHandler<TQuery, TResult>
where TQuery : IQuery<TResult>
{
public SqlServerQueryHandler(IOptions<SqlConfig> connectionString)
{
this.ConnectionString = connectionString.Value.ConnectionString;
}
protected string ConnectionString { get; }
}

Answer 1

what solve my probleme is the following code :
public class TestStartup : Startup
{
public TestStartup(IConfiguration configuration, IHostingEnvironment env) : base(configuration)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
.AddEnvironmentVariables();
this.Configuration = builder.Build();
}
Include the appsettings.json via interface on the output directory