Background
I have a small ecto project that has some tests. This project is from the book “Designing Elixir Systems with OTP” and I am in the last part, testing the boundary.
The book was written with Elixir 1.8.* in mind, but I am using 1.9.* and I think this is what is causing the issue.
Code
This is my config.exs:
use Mix.Config
config :mastery_persistence,
ecto_repos: [MasteryPersistence.Repo]
config :logger, level: :info
import_config "#{Mix.env()}.exs"
And here my test.exs config file:
use Mix.Config
config :mastery_persistence, MasteryPersistence.Repo,
database: "mastery_test",
hostname: "localhost",
pool: Ecto.Adapters.SQL.Sandbox
As you can see there is nothing extraordinary. I guess one of the files where the issue could be is my application.ex:
defmodule MasteryPersistence.Application do
@moduledoc false
use Application
def start(_type, _args) do
children = [
MasteryPersistence.Repo
]
opts = [strategy: :one_for_one, name: MasteryPersistence.Supervisor]
Supervisor.start_link(children, opts)
end
end
But this is mainly boilerplate code.
Error
The code is fairly simple, but when I run my test, it fails. Following is my test file:
defmodule MasteryPersistenceTest do
use ExUnit.Case
alias MasteryPersistenceTest.{Response, Repo}
#########
# Setup #
#########
setup do
:ok = Ecto.Adapters.SQL.Sandbox.checkout(Repo)
response = %{
quiz_title: :simple_addition,
template_name: :single_digit_addition,
to: "3 + 4",
email: "student@example.com",
answer: "7",
correct: true,
timestamp: DateTime.utc_now()
}
{:ok, %{response: response}}
end
#########
# Tests #
#########
test "responses are recorded", %{response: response} do
assert Repo.aggregate(Response, :count, :id) == 0
assert :ok = MasteryPersistence.record_response(response)
assert Repo.all(Response) |> Enum.map(fn r -> r.email end) ==
[response.email]
end
end
Aside from the setup, there isn’t really anything interesting here that could cause issues. The error is as follows:
1) test responses are recorded (MasteryPersistenceTest)
test/mastery_persistence_test.exs:29
** (RuntimeError) could not lookup MasteryPersistenceTest.Repo because it was not started or it does not exist
stacktrace:
(ecto) lib/ecto/repo/registry.ex:18: Ecto.Repo.Registry.lookup/1
(ecto) lib/ecto/adapter.ex:127: Ecto.Adapter.lookup_meta/1
(ecto_sql) lib/ecto/adapters/sql/sandbox.ex:486: Ecto.Adapters.SQL.Sandbox.lookup_meta!/1
(ecto_sql) lib/ecto/adapters/sql/sandbox.ex:414: Ecto.Adapters.SQL.Sandbox.checkout/2
test/mastery_persistence_test.exs:11: MasteryPersistenceTest.__ex_unit_setup_0/1
test/mastery_persistence_test.exs:1: MasteryPersistenceTest.__ex_unit__/2
Research
I have tried to execute the original version from the book in elixir 1.8.* and it worked. The code files we have are basically identical.
I have also searched this forum for solution to this problem and I found one regarding Application.start but I am unsure if that even applies to this issue.
Question
I have concluded this is some configuration issue, I am missing something regarding 1.9.*. But what is it?
Do you think my conclusion makes sense?
What do you think the error is?
