opengleametry_test

import gleam/dict
import gleeunit
import opengleametry/span
import opengleametry_test

pub fn main() {
  opengleametry_test.reconfigure_opentelemetry()
  gleeunit.main()
}

pub fn a_test() {
  opengleametry_test.set_self_as_exporter_pid()
  {
    use _ctx <- span.with("hello", [#("zapf", "dingbat")])
    Nil
  }
  assert opengleametry_test.receive_attributes(123, "hello")
    == Ok(#(opengleametry_test.OkStatus, dict.from_list([#("zapf", "dingbat")])))
}

The full span as this test package receives under the hood is of no interest. The status and attributes should do.

The function takes a name argument, so you do not need to receive all spans. Beware that spans will linger in the inbox of your test process you may receive spans by name from an earlier test!

Special Note

Part of the output is this:

=WARNING REPORT==== 6-Sep-2025::21:30:55.530928 ===
OTLP exporter failed to initialize with exception throw:{application_either_not_started_or_not_ready,
                                                         tls_certificate_check}

 === opengleametry_test does not care about opentelemetry_exporter
 === opengleametry_test will now stop opentelemetry and configure+restart
     it to direct spans to the current process.

=INFO REPORT==== 6-Sep-2025::21:30:55.645980 ===
    application: opentelemetry
    exited: stopped
    type: temporary

Gleam launches all dependent apps. That includes:

• opentelemetry on which this package depends. We must reconfigure it. That is what the first line in main does. We print a warning and then a supervisor reports on what we are doing.
• opentelemetry_exporter if your package depends on it (very likely). This produces the top warning. We do not care, we do not need it for this package, but it is not in the way after opentelemetry was reconfigured.