Add test case for Pleroma follow activity (ref #1984)

crates/apub/assets/pleroma/activities/follow.json

@@ -0,0 +1,18 @@
+{
+  "@context": [
+    "https://www.w3.org/ns/activitystreams",
+    "https://mycrowd.ca/schemas/litepub-0.1.jsonld",
+    {
+      "@language": "und"
+    }
+  ],
+  "actor": "https://mycrowd.ca/users/kinetix",
+  "cc": [],
+  "id": "https://mycrowd.ca/activities/dab6a4d3-0db0-41ee-8aab-7bfa4929b4fd",
+  "object": "https://lemmy.ca/u/kinetix",
+  "state": "pending",
+  "to": [
+    "https://lemmy.ca/u/kinetix"
+  ],
+  "type": "Follow"
+}

crates/apub/src/protocol/activities/following/mod.rs

@@ -4,13 +4,17 @@ pub mod undo_follow;
 
 #[cfg(test)]
 mod tests {
-  use crate::protocol::{
-    activities::following::{
-      accept::AcceptFollowCommunity,
-      follow::FollowCommunity,
-      undo_follow::UndoFollowCommunity,
+  use crate::{
+    context::WithContext,
+    objects::tests::file_to_json_object,
+    protocol::{
+      activities::following::{
+        accept::AcceptFollowCommunity,
+        follow::FollowCommunity,
+        undo_follow::UndoFollowCommunity,
+      },
+      tests::test_parse_lemmy_item,
     },
-    tests::test_parse_lemmy_item,
   };
   use serial_test::serial;
 
@@ -22,5 +26,7 @@ mod tests {
     test_parse_lemmy_item::<UndoFollowCommunity>(
       "assets/lemmy/activities/following/undo_follow.json",
     );
+
+    file_to_json_object::<WithContext<FollowCommunity>>("assets/pleroma/activities/follow.json");
   }
 }