diff --git a/backend/tests/test_04_submission.py b/backend/tests/test_04_submission.py
index fc7051a3..72c6a9df 100644
--- a/backend/tests/test_04_submission.py
+++ b/backend/tests/test_04_submission.py
@@ -5,6 +5,9 @@
 from httpx import AsyncClient
 from tests.test_01_auth import Acc
 from sqlalchemy.orm import Session
+import db.crud_answer as crud_answer
+from models.answer import Answer
+from models.question import QuestionType
 
 pytestmark = pytest.mark.asyncio
 sys.path.append("..")
@@ -143,9 +146,76 @@ async def test_get_form(self, app: FastAPI, session: Session,
             }]
         }
 
+    @pytest.mark.asynio
+    async def test_append_value_crud_answer_func(
+            self, app: FastAPI, session: Session, client: AsyncClient) -> None:
+        answer = Answer(question=1, created_by=1, created=None)
+        # option
+        value = ["Option 1"]
+        res = crud_answer.append_value(
+            answer=answer, value=value, type=QuestionType.option)
+        assert res.question == answer.question
+        assert res.options == value
+        assert res.text is None
+        assert res.value is None
+        # administration
+        answer = Answer(question=2, created_by=1, created=None)
+        value = 10
+        res = crud_answer.append_value(
+            answer=answer, value=value, type=QuestionType.administration)
+        assert res.question == answer.question
+        assert res.value == value
+        assert res.text is None
+        assert res.options is None
+        # geo
+        answer = Answer(question=3, created_by=1, created=None)
+        value = [-7.836114, 110.331143]
+        res = crud_answer.append_value(
+            answer=answer, value=value, type=QuestionType.geo)
+        assert res.question == answer.question
+        assert res.text == ("{}|{}").format(value[0], value[1])
+        assert res.value is None
+        assert res.options is None
+        # text
+        answer = Answer(question=4, created_by=1, created=None)
+        value = "Test"
+        res = crud_answer.append_value(
+            answer=answer, value=value, type=QuestionType.text)
+        assert res.question == answer.question
+        assert res.text == value
+        assert res.value is None
+        assert res.options is None
+        # number
+        answer = Answer(question=5, created_by=1, created=None)
+        value = 99
+        res = crud_answer.append_value(
+            answer=answer, value=value, type=QuestionType.number)
+        assert res.question == answer.question
+        assert res.value == value
+        assert res.text is None
+        assert res.options is None
+        # date
+        answer = Answer(question=6, created_by=1, created=None)
+        value = "2021-12-21"
+        res = crud_answer.append_value(
+            answer=answer, value=value, type=QuestionType.date)
+        assert res.question == answer.question
+        assert res.text == value
+        assert res.value is None
+        assert res.options is None
+        # multiple option
+        answer = Answer(question=7, created_by=1, created=None)
+        value = ["Multiple Option 1", "Multiple Option 2"]
+        res = crud_answer.append_value(
+            answer=answer, value=value, type=QuestionType.multiple_option)
+        assert res.question == answer.question
+        assert res.options == value
+        assert res.text is None
+        assert res.value is None
+
     @pytest.mark.asyncio
-    async def test_submit_data(self, app: FastAPI, session: Session,
-                               client: AsyncClient) -> None:
+    async def test_submit_data(
+            self, app: FastAPI, session: Session, client: AsyncClient) -> None:
         res = await client.post(
             app.url_path_for("data:create", form_id=1),
             json=[{