[tests] add follow outbox test

tests/test_outbox.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+import pytest
+import fastapi
+import respx
+import httpx
+from uuid import uuid4
+from tests import factories
+
+from unittest import mock
+from app.main import app
+from app.utils import precheck
+from fastapi.testclient import TestClient
+from sqlalchemy.orm import Session
+from app import activitypub as ap, httpsig
+from app.config import AP_CONTENT_TYPE
+from app import models
+from sqlalchemy import select
+
+
+@pytest.mark.asyncio
+async def test_outbox_send_follow_request(
+    db: Session,
+    client: TestClient,
+    respx_mock: respx.MockRouter,
+) -> None:
+    # build test actor
+    ra = factories.RemoteActorFactory(
+        base_url="https://example.com",
+        username="test",
+        public_key="pk",
+    )
+
+    remote_ap_id = ra.ap_id # type: ignore
+    app.dependency_overrides[precheck.inbox_prechecker] = \
+        factories.inbox_prechecker
+
+    # mock request
+    respx_mock.get(remote_ap_id).mock(
+        return_value=httpx.Response(200,json=ra.ap_actor))
+    respx_mock.post(remote_ap_id + "/inbox").mock(
+        return_value=httpx.Response(202))
+
+    from app.database import async_session
+    from app.boxes import send_follow
+
+    async with async_session() as db_session: #type: ignore
+        await send_follow(db_session, remote_ap_id)
+
+    # And the Follow activity was created in the outbox
+    outbox_object = db.execute(select(models.OutboxObject)).scalar_one()
+    assert outbox_object.ap_type == "Follow"
+    assert outbox_object.activity_object_ap_id == remote_ap_id