ASP.NET Core works with two test servers to test integration

Question

I am trying to run some integration tests for the token management API. The API also requires the launch of the token API.

Thus, my integration test should run both IdentityServer4 Web / API and management APIs at the same time. When I create two instances TestServer, it seems like they both end in the same BaseAddress( http://localhost).

private readonly TestServer _identityTestServer;
private readonly TestServer _mgmtTestServer;
private readonly AppMgmtConfig _config;
private readonly AdminClient _adminClient;
private const string _certificatePassword = "test";

public AdminClientTests() : base(nameof(AdminClientTests))
{
    var connectionString = GetConnectionString();
    var dbSettings = new DbSettings(connectionString);

    Environment.SetEnvironmentVariable("IdentityServer4ConnString",
        dbSettings.IdentityServerConnectionString);
    Environment.SetEnvironmentVariable("CertificatePassword", _certificatePassword);

    _identityTestServer = new TestServer(new WebHostBuilder()
        .UseStartup<USBIdentityServer.Startup>()
        .UseEnvironment("IntegrationTest"));
    USBIdentityServer.Program.InitializeDatabase(_identityTestServer.Host);

    _mgmtTestServer = new TestServer(new WebHostBuilder()
        .UseStartup<IdentityServer4.Management.Startup>()
        .UseEnvironment("IntegrationTest"));

    _config = GetConfig();
    _adminClient = new AdminClient(_config);
}

Note: Things I've already tried:

• Add .UseUrls("http://localhost:5001")to check if TestServer will work on this port.
• Add serverName.BaseAddress = new Uri("http://localhost:5001");to check if TestServer will work on this port.

None of them affect him.