Add base tests for post

backend/app/tests/utils/post.py

@@ -0,0 +1,12 @@
+from sqlmodel import Session
+
+from app.models.post import Post, PostCreate
+from app.tests.utils.utils import random_lower_string
+
+
+def create_random_post(db: Session, name: str = None) -> Post:
+    if not name:
+        name = random_lower_string()
+
+    post_in = PostCreate(name=name)
+    return Post.create(session=db, create_obj=post_in)