diff --git a/backend/api/tests/api/test_auto_labeling.py b/backend/api/tests/api/test_auto_labeling.py
index 87dd4749..8d89dc55 100644
--- a/backend/api/tests/api/test_auto_labeling.py
+++ b/backend/api/tests/api/test_auto_labeling.py
@@ -1,25 +1,27 @@
+import pathlib
 from unittest.mock import patch
 
 from auto_labeling_pipeline.models import RequestModelFactory
 from rest_framework import status
 from rest_framework.reverse import reverse
 
-from ...models import DOCUMENT_CLASSIFICATION, Category
-from .utils import (CRUDMixin, make_annotation, make_doc,
-                    make_user, prepare_project)
+from ...models import DOCUMENT_CLASSIFICATION
+from ...views.auto_labeling import load_data_as_b64
+from .utils import CRUDMixin, prepare_project
+
+data_dir = pathlib.Path(__file__).parent / 'data'
 
 
 class TestConfigParameter(CRUDMixin):
 
-    @classmethod
-    def setUpTestData(cls):
-        cls.project = prepare_project(task=DOCUMENT_CLASSIFICATION)
-        cls.data = {
+    def setUp(self):
+        self.project = prepare_project(task=DOCUMENT_CLASSIFICATION)
+        self.data = {
             'model_name': 'GCP Entity Analysis',
             'model_attrs': {'key': 'hoge', 'type': 'PLAIN_TEXT', 'language': 'en'},
             'text': 'example'
         }
-        cls.url = reverse(viewname='auto_labeling_parameter_testing', args=[cls.project.item.id])
+        self.url = reverse(viewname='auto_labeling_parameter_testing', args=[self.project.item.id])
 
     @patch('api.views.auto_labeling.AutoLabelingConfigParameterTest.send_request', return_value={})
     def test_called_with_proper_model(self, mock):
@@ -36,6 +38,7 @@ class TestConfigParameter(CRUDMixin):
 
     @patch('api.views.auto_labeling.AutoLabelingConfigParameterTest.send_request', return_value={})
     def test_called_with_image(self, mock):
+        self.data['text'] = load_data_as_b64(data_dir / 'images/1500x500.jpeg')
         self.assert_create(self.project.users[0], status.HTTP_200_OK)
         _, kwargs = mock.call_args
         self.assertEqual(kwargs['example'], self.data['text'])
diff --git a/backend/api/views/auto_labeling.py b/backend/api/views/auto_labeling.py
index 6b2cafec..81b2a0a0 100644
--- a/backend/api/views/auto_labeling.py
+++ b/backend/api/views/auto_labeling.py
@@ -1,3 +1,5 @@
+import base64
+
 import botocore.exceptions
 import requests
 from auto_labeling_pipeline.mappings import MappingTemplate
@@ -22,6 +24,12 @@ from ..serializers import (AutoLabelingConfigSerializer,
                            get_annotation_serializer)
 
 
+def load_data_as_b64(filepath):
+    with open(filepath, 'rb') as f:
+        byte_str = base64.b64encode(f.read())
+        return byte_str.decode('utf-8')
+
+
 class AutoLabelingTemplateListAPI(APIView):
     permission_classes = [IsAuthenticated & IsProjectAdmin]
 
@@ -137,13 +145,7 @@ class AutoLabelingConfigParameterTest(APIView):
             raise e
 
     def prepare_example(self):
-        if self.project.is_task_of('text'):
-            return self.request.data['text']
-        elif self.project.is_task_of('image'):
-            return ''
-        elif self.project.is_task_of('speech'):
-            raise NotImplementedError('can not handle speech data now.')
-        raise NotImplementedError('The project type is unknown.')
+        return self.request.data['text']
 
     def post(self, *args, **kwargs):
         model = self.create_model()