How do I provide my nginx.conf

I'm trying to use the tutorial and get my testing with Test::Nginx started. Here is what I saw

use Test::Nginx::Socket 'no_plan';

run_tests();

__DATA__

=== TEST 1: hello, world
This is just a simple demonstration of the
echo directive provided by ngx_http_echo_module.
--- config
location = /t {
    echo "hello, world!";
}
--- request
GET /t
--- response_body
hello, world!
--- error_code: 200

I don't understand how I can use my own server/nginx.cnf to run the tests? This is already starting a server and doing the test. I already have an nginx.cnf that I like to include. How do I do that?

Start with the tutorial example in the issue and the Test::Nginx::Socket setup it uses. Clarify how an existing nginx.conf can be supplied or included when running these data-driven tests, and document the required invocation or configuration steps so users can reproduce the setup.