Teaspoon does not work with Puma 3.7.0 as a server

[rhymes]

Hello,

I've noticed that teaspoon stopped working with Puma 3.7.0

➜ SERVER_TIMEOUT=60 bundle exec teaspoon Starting the Teaspoon server...
[22313] Puma starting in cluster mode...
[22313] * Version 3.7.0 (ruby 2.3.3-p222), codename: Snowy Sagebrush
[22313] * Min threads: 1, max threads: 1
[22313] * Environment: development
[22313] * Process workers: 2
[22313] * Preloading application
[22313] * Listening on tcp://0.0.0.0:3000
[22313] Use Ctrl-C to stop
[22313] - Worker 0 (pid: 22317) booted, phase: 0
[22313] - Worker 1 (pid: 22319) booted, phase: 0
Unable to start teaspoon server; consider increasing the timeout with config.server_timeout.
[22319] ! Detected parent died, dying[22317] ! Detected parent died, dying

All is well with the previous release of Puma, 3.6.2

➜ closer git:(puma37) SERVER_TIMEOUT=60 bundle exec teaspoon Starting the Teaspoon server...
[22409] Puma starting in cluster mode...
[22409] * Version 3.6.2 (ruby 2.3.3-p222), codename: Sleepy Sunday Serenity
[22409] * Min threads: 1, max threads: 1
[22409] * Environment: test
[22409] * Process workers: 2
[22409] * Preloading application
[22409] * Listening on tcp://127.0.0.1:55068
[22409] Use Ctrl-C to stop
[22409] - Worker 0 (pid: 22415) booted, phase: 0
[22409] - Worker 1 (pid: 22416) booted, phase: 0
Teaspoon running default suite at http://127.0.0.1:55068/teaspoon/default
......

Finished in 0.03000 seconds
6 examples, 0 failures

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[22416] ! Detected parent died, dying
[22415] ! Detected parent died, dying

I'm not sure what's going on, here's Puma's 3.7.0 release changelog: https://github.com/puma/puma/blob/master/History.md#370--2017-01-04

[jejacks0n]

potentially related? puma/puma#1154

[jwhitmire]

I hit this issue as well and I think it is related to the port issue @jejacks0n referenced. If I explicitly set config.server_port in my config file, then it worked for me.

[twalpole]

The issue is that puma attempts to load a configuration file if ones exists and gives any settings in that file priority over whatever settings are passed into the method used to start puma. The configuration files tried are config/puma/<environment>.rb and if that doesn't exist it will try for config/puma.rb . You should be able to workaround around this issue by either telling puma not to load any config files (by somehow passing in the config_files: ['-'] option), or set the settings you want teaspoon to use in config/puma/test.rb

[mathieujobin]

would be nice to have a fix for this, since ruby3 no longer ships with webrick.
so moving the CI build to use puma instead would be much appreciate
any volunteer?