Add tests for setting `:instance, :quarantined_instances`

No test was done for quarantined instances yet. I added a factory for followers_only notes and checked
* That no followers only post is send when the target server is quarantined
* That a followers only post is send when the target server is not quarantined

test/pleroma/web/activity_pub/publisher_test.exs

@@ -267,6 +267,80 @@ test "publish to url with with different ports" do
   end
 
   describe "publish/2" do
+    test_with_mock "doesn't publish a non-public activity to quarantined instances.",
+                   Pleroma.Web.Federator.Publisher,
+                   [:passthrough],
+                   [] do
+      Config.put([:instance, :quarantined_instances], ["domain.com"])
+
+      follower =
+        insert(:user, %{
+          local: false,
+          inbox: "https://domain.com/users/nick1/inbox",
+          ap_enabled: true
+        })
+
+      actor = insert(:user, follower_address: follower.ap_id)
+
+      {:ok, follower, actor} = Pleroma.User.follow(follower, actor)
+      actor = refresh_record(actor)
+
+      note_activity =
+        insert(:followers_only_note_activity,
+          user: actor,
+          recipients: [follower.ap_id]
+        )
+
+      res = Publisher.publish(actor, note_activity)
+
+      assert res == :ok
+
+      assert not called(
+               Pleroma.Web.Federator.Publisher.enqueue_one(Publisher, %{
+                 inbox: "https://domain.com/users/nick1/inbox",
+                 actor_id: actor.id,
+                 id: note_activity.data["id"]
+               })
+             )
+    end
+
+    test_with_mock "Publishes a non-public activity to non-quarantined instances.",
+                   Pleroma.Web.Federator.Publisher,
+                   [:passthrough],
+                   [] do
+      Config.put([:instance, :quarantined_instances], ["somedomain.com"])
+
+      follower =
+        insert(:user, %{
+          local: false,
+          inbox: "https://domain.com/users/nick1/inbox",
+          ap_enabled: true
+        })
+
+      actor = insert(:user, follower_address: follower.ap_id)
+
+      {:ok, follower, actor} = Pleroma.User.follow(follower, actor)
+      actor = refresh_record(actor)
+
+      note_activity =
+        insert(:followers_only_note_activity,
+          user: actor,
+          recipients: [follower.ap_id]
+        )
+
+      res = Publisher.publish(actor, note_activity)
+
+      assert res == :ok
+
+      assert called(
+               Pleroma.Web.Federator.Publisher.enqueue_one(Publisher, %{
+                 inbox: "https://domain.com/users/nick1/inbox",
+                 actor_id: actor.id,
+                 id: note_activity.data["id"]
+               })
+             )
+    end
+
     test_with_mock "publishes an activity with BCC to all relevant peers.",
                    Pleroma.Web.Federator.Publisher,
                    [:passthrough],

test/support/factory.ex

@@ -142,6 +142,11 @@ defp attachment_data(ap_id, href) do
     }
   end
 
+  def followers_only_note_factory(attrs \\ %{}) do
+    %Pleroma.Object{data: data} = note_factory(attrs)
+    %Pleroma.Object{data: Map.merge(data, %{"to" => [data["actor"] <> "/followers"]})}
+  end
+
   def audio_factory(attrs \\ %{}) do
     text = sequence(:text, &"lain radio episode #{&1}")
 
@@ -267,6 +272,33 @@ defp featured_collection_activity(attrs, type) do
     |> Map.merge(attrs)
   end
 
+  def followers_only_note_activity_factory(attrs \\ %{}) do
+    user = attrs[:user] || insert(:user)
+    note = insert(:followers_only_note, user: user)
+
+    data_attrs = attrs[:data_attrs] || %{}
+    attrs = Map.drop(attrs, [:user, :note, :data_attrs])
+
+    data =
+      %{
+        "id" => Pleroma.Web.ActivityPub.Utils.generate_activity_id(),
+        "type" => "Create",
+        "actor" => note.data["actor"],
+        "to" => note.data["to"],
+        "object" => note.data,
+        "published" => DateTime.utc_now() |> DateTime.to_iso8601(),
+        "context" => note.data["context"]
+      }
+      |> Map.merge(data_attrs)
+
+    %Pleroma.Activity{
+      data: data,
+      actor: data["actor"],
+      recipients: data["to"]
+    }
+    |> Map.merge(attrs)
+  end
+
   def note_activity_factory(attrs \\ %{}) do
     user = attrs[:user] || insert(:user)
     note = attrs[:note] || insert(:note, user: user)