Avoid using Mix.env at runtime

README.md

@@ -49,8 +49,9 @@ config :unleash, Unleash,
   backup_file: nil, # Backup file in the event that contacting the server fails
   custom_http_headers: [], # A keyword list of custom headers to send to the server
   disable_client: false, # Whether or not to enable the client
-  disable_metrics: false # Whether or not to send metrics,
+  disable_metrics: false, # Whether or not to send metrics,
   retries: -1 # How many times to retry on failure, -1 disables limit
+  app_env: :dev # Which environment we're in
 ```
 
 `:custom_http_headers` should follow the format prescribed by

config/dev.exs

@@ -4,4 +4,5 @@ config :unleash, Unleash,
   url: "http://localhost:4242/api",
   appname: "dev",
   instance_id: "dev",
-  metrics_period: 15 * 1000
+  metrics_period: 15 * 1000,
+  app_env: :dev

lib/unleash/config.ex

@@ -14,14 +14,20 @@ defmodule Unleash.Config do
     disable_metrics: false,
     retries: -1,
     client: Unleash.Client,
-    http_client: Mojito
+    http_client: Mojito,
+    app_env: :test
   ]
 
   def url do
     application_env()
     |> Keyword.fetch!(:url)
   end
 
+  def test? do
+    application_env()
+    |> Keyword.fetch!(:app_env) == :test
+  end
+
   def appname do
     application_env()
     |> Keyword.fetch!(:appname)

lib/unleash/metrics.ex

@@ -31,7 +31,7 @@ defmodule Unleash.Metrics do
   def start_link(state, opts \\ []) do
     {:ok, pid} = GenServer.start_link(__MODULE__, state, opts)
 
-    unless Code.ensure_loaded?(Mix) and Mix.env() == :test do
+    unless Config.test? do
       initialize(pid)
     end
 
@@ -53,7 +53,7 @@ defmodule Unleash.Metrics do
     {:noreply, send_metrics(state)}
   end
 
-  if Code.ensure_loaded?(Mix) and Mix.env() == :test do
+  if Config.test? do
     def handle_call(:send_metrics, _from, state) do
       {:reply, :ok, send_metrics(state)}
     end

lib/unleash/repo.ex

@@ -17,7 +17,7 @@ defmodule Unleash.Repo do
   def start_link(state) do
     {:ok, pid} = GenServer.start_link(__MODULE__, state, name: Unleash.Repo)
 
-    unless Code.ensure_loaded?(Mix) and Mix.env() == :test do
+    unless Config.test? do
       initialize()
     end