diff --git a/ecs/crm-datafetch/tests/aws/test_s3.py b/ecs/crm-datafetch/tests/aws/test_s3.py
index db4f1c09..db97825a 100644
--- a/ecs/crm-datafetch/tests/aws/test_s3.py
+++ b/ecs/crm-datafetch/tests/aws/test_s3.py
@@ -1,7 +1,5 @@
 import pytest
 from src.aws.s3 import ConfigBucket, S3Resource
-from src.system_var import environments
-from src.system_var.constants import OBJECT_INFO_FILENAME, OBJECT_INFO_FOLDER
 
 
 @pytest.fixture
@@ -27,7 +25,7 @@ class TestS3Resource:
         s3_resource = S3Resource(bucket_name)
         s3_resource.put_object('hogehoge/test.txt', 'aaaaaaaaaaaaaaa')
         actual = s3_client.get_object(Bucket=bucket_name, Key='hogehoge/test.txt')
-        assert actual['Body'].read() == b'aaaaaaaaaaaaaaa'
+        assert actual['Body'].read().decode('utf-8') == 'aaaaaaaaaaaaaaa'
 
     def test_copy(self, s3_test, s3_client, bucket_name):
         for_copy_bucket = 'for-copy-bucket'
@@ -47,7 +45,6 @@ class TestS3Resource:
 class TestConfigBucket:
 
     def test_get_object_info_file(self, s3_test, s3_client, bucket_name, monkeypatch):
-        # = bucket_name
         monkeypatch.setattr('src.aws.s3.CRM_CONFIG_BUCKET', bucket_name)
         monkeypatch.setattr('src.aws.s3.OBJECT_INFO_FOLDER', 'crm')
         monkeypatch.setattr('src.aws.s3.OBJECT_INFO_FILENAME', 'objects.json')
@@ -57,3 +54,27 @@ class TestConfigBucket:
         actual = config_bucket.get_object_info_file()
         print(actual)
         assert actual == 'aaaaaaaaaaaaaaa'
+
+    def test_get_last_fetch_datetime_file(self, s3_test, s3_client, bucket_name, monkeypatch):
+        monkeypatch.setattr('src.aws.s3.CRM_CONFIG_BUCKET', bucket_name)
+        monkeypatch.setattr('src.aws.s3.LAST_FETCH_DATE_FOLDER', 'crm')
+        s3_client.put_object(Bucket=bucket_name, Key=f'crm/Object.json', Body=b'aaaaaaaaaaaaaaa')
+        config_bucket = ConfigBucket()
+        print('*' * 50, str(config_bucket), '*' * 50)
+        actual = config_bucket.get_last_fetch_datetime_file('Object.json')
+        print(actual)
+        assert actual == 'aaaaaaaaaaaaaaa'
+
+    def test_put_last_fetch_datetime_file(self, s3_test, s3_client, bucket_name, monkeypatch):
+        monkeypatch.setattr('src.aws.s3.CRM_CONFIG_BUCKET', bucket_name)
+        monkeypatch.setattr('src.aws.s3.LAST_FETCH_DATE_FOLDER', 'crm')
+        config_bucket = ConfigBucket()
+        print('*' * 50, str(config_bucket), '*' * 50)
+        config_bucket.put_last_fetch_datetime_file('Object.json', 'aaaaaaaaaaaaaaa')
+        actual = s3_client.get_object(Bucket=bucket_name, Key=f'crm/Object.json')
+        assert actual['Body'].read().decode('utf-8') == 'aaaaaaaaaaaaaaa'
+
+    def test_config_bucket_str(self, s3_test, s3_client, bucket_name, monkeypatch):
+        monkeypatch.setattr('src.aws.s3.CRM_CONFIG_BUCKET', bucket_name)
+        config_bucket = ConfigBucket()
+        assert str(config_bucket) == bucket_name