Phoenix with exq: How do I execute mix test without redis running - redis

Question

I use exq in my Phoenix application with Phoenix 1.4.16 to run some background jobs.
One of them can be as simple as this:
defmodule PeopleJob do
def perform(request) do
IO.puts("Hello from PeopleJob:\n#{inspect(request)}")
end
end
It runs with redis in dev environment perfectly.
The problem is that when I push the code to a CI server that has no redis, all the tests fail.
The test config is like this
In config/test.exs:
config :exq, queue_adapter: Exq.Adapters.Queue.Mock
In test/test_helper.exs:
Exq.Mock.start_link(mode: :inline)
When I run "mix test" on a machine without redis running, it fails like this:
** (Mix) Could not start application exq: Exq.start(:normal, []) returned an error: shutdown: failed to start child: Exq.Manager.Server
** (EXIT) an exception was raised:
** (RuntimeError)
====================================================================================================
ERROR! Could not connect to Redis!
Configuration passed in: [host: "127.0.0.1", port: 6379, database: 0, password: nil]
Error: :error
Reason: {:badmatch, {:error, %Redix.ConnectionError{reason: :closed}}}
Make sure Redis is running, and your configuration matches Redis settings.
====================================================================================================
(exq) lib/exq/manager/server.ex:393: Exq.Manager.Server.check_redis_connection/1
(exq) lib/exq/manager/server.ex:173: Exq.Manager.Server.init/1
(stdlib) gen_server.erl:374: :gen_server.init_it/2
(stdlib) gen_server.erl:342: :gen_server.init_it/6
(stdlib) proc_lib.erl:249: :proc_lib.init_p_do_apply/3
Actually I try all 3 modes :redis, :fake and :inline, but all of them fail to start the mix test.
Question: Can I run "mix test" on a machine that has no redis?
The reason is that our company doesn't want to install redis on the Travis CI machine.
I expected that using Exq Mock in the test environment would allow the test to run without redis, but it is not the case.

Answer 1

I figure it out.
In config/test.exs:
config :exq, queue_adapter: Exq.Adapters.Queue.Mock
config :exq, start_on_application: false
In test/test_helper.exs:
Exq.Mock.start_link(mode: :inline)
Adding config :exq, start_on_application: false to config/test.exs solved this problem.