Heroku tests started failing overnight? (cannot configure sandbox) - testing

Question

I’m getting a strange error when my tests run on Heroku which wasn’t happening on Friday, everything is fine locally.
-----> Running test command `mix test`...
08:29:52.761 [info] Already up
08:29:53.389 [info] seeding in prod environment
08:29:53.389 [info] runing default seeds
All departments inserted
** (RuntimeError) cannot configure sandbox with pool DBConnection.Poolboy.
To use the SQL Sandbox, configure your repository pool as:
pool: Ecto.Adapters.SQL.Sandbox
(ecto) lib/ecto/adapters/sql/sandbox.ex:429: Ecto.Adapters.SQL.Sandbox.mode/2
(elixir) lib/code.ex:376: Code.require_file/2
(elixir) lib/enum.ex:675: Enum."-each/2-lists^foreach/1-0-"/2
(elixir) lib/enum.ex:675: Enum.each/2
(mix) lib/mix/tasks/test.ex:229: Mix.Tasks.Test.run/1
-----> test command `mix test` failed with exit status 1
No changes to test config in months…
# Configure your database
config :ev2, Ev2.Repo,
adapter: Ecto.Adapters.Postgres,
username: "postgres",
password: "postgres",
database: "ev2_timecards_test",
hostname: "localhost",
pool: Ecto.Adapters.SQL.Sandbox
app.json currently looks like this:
"environments": {
"test": {
"env": {
"IS_STAGING": {
"required": false
}
},
"addons":[
"heroku-postgresql:hobby-dev",
"heroku-redis:hobby-dev"
],
"scripts": {
"test-setup": "mix ecto.migrate",
"test": "mix test",
"postdeploy": "bash <(curl -s https://codecov.io/bash)"
}
}
}
Running with Phoenix 1.3.
I wonder if anyone is facing this on Monday morning or if anyone has any suggestions?
Thanks in advance!

Answer 1

Set the mix_env to test in your setup and test script:
"scripts": {
"test-setup": "MIX_ENV=test mix ecto.migrate",
"test": "MIX_ENV=test mix test"
}