Adds retry mechanism to prevent flakiness.

test/philomena_web/controllers/deactivation_controller_test.exs

@@ -1,4 +1,6 @@
 defmodule PhilomenaWeb.DeactivationControllerTest do
+  import Philomena.TestUtilities
+
   use PhilomenaWeb.ConnCase, async: true
 
   alias Swoosh.Adapters.Local.Storage.Memory
@@ -24,8 +26,10 @@ defmodule PhilomenaWeb.DeactivationControllerTest do
       assert Memory.all()
              |> Enum.find(&(&1.subject == "Reactivation instructions for your account")) != nil
 
-      user = Users.get_user!(user.id)
-      assert user.deleted_by_user_id == user.id
+      assert_retry(fn ->
+        user = Users.get_user!(user.id)
+        user.deleted_by_user_id == user.id
+      end)
     end
   end
 end

test/philomena_web/controllers/reactivation_controller_test.exs

@@ -1,5 +1,6 @@
 defmodule PhilomenaWeb.ReactivationControllerTest do
   use PhilomenaWeb.ConnCase, async: true
+  import Philomena.TestUtilities
 
   alias Swoosh.Adapters.Local.Storage.Memory
   alias Philomena.Users
@@ -33,8 +34,10 @@ defmodule PhilomenaWeb.ReactivationControllerTest do
       conn = post(conn, url, %{"token" => token})
       assert redirected_to(conn) == ~p"/"
 
-      user = Users.get_user!(user.id)
-      assert user.deleted_by_user_id == nil
+      assert_retry(fn ->
+        user = Users.get_user!(user.id)
+        user.deleted_by_user_id == nil
+      end)
     end
   end
 

test/support/utilities.ex

@@ -0,0 +1,21 @@
+import ExUnit.Assertions
+
+defmodule Philomena.TestUtilities do
+  defp assert_retry(_, attempts, max_retries, _) when attempts > max_retries, do: false
+
+  defp assert_retry(evalulation_lambda, attempts, max_retries, timeout_in_ms) do
+    case evalulation_lambda.() do
+      true ->
+        true
+
+      false ->
+        Process.sleep(timeout_in_ms)
+        assert_retry(evalulation_lambda, attempts + 1, max_retries, timeout_in_ms)
+    end
+  end
+
+  def assert_retry(evaluation_lambda, max_retries \\ 3, timeout_in_ms \\ 1000)
+      when is_function(evaluation_lambda) do
+    assert assert_retry(evaluation_lambda, 0, max_retries, timeout_in_ms)
+  end
+end