diff --git a/sunholo/tests/test_config.py b/sunholo/tests/test_config.py
new file mode 100644
index 0000000..a3e6423
--- /dev/null
+++ b/sunholo/tests/test_config.py
@@ -0,0 +1,67 @@
+import pytest
+from unittest.mock import patch, mock_open
+from utils import config
+
+@patch('google.cloud.storage.Client')
+def test_fetch_config(mock_client):
+    # Create a mock bucket and blob
+    mock_bucket = Mock()
+    mock_blob = Mock()
+    mock_client.get_bucket.return_value = mock_bucket
+    mock_bucket.get_blob.return_value = mock_blob
+
+    # Test that the function correctly fetches the blob and returns the updated time
+    mock_blob.updated = '2022-01-01T00:00:00Z'
+    result = config.fetch_config('bucket_name', 'blob_name')
+    assert result == '2022-01-01T00:00:00Z'
+
+    # Test the case where the blob does not exist and the function should return None
+    mock_bucket.get_blob.return_value = None
+    result = config.fetch_config('bucket_name', 'blob_name')
+    assert result == None
+
+@patch('os.path.isfile')
+def test_get_module_filepath(mock_isfile):
+    # Test that the function correctly returns the full file path of the mock file
+    mock_isfile.return_value = True
+    result = config.get_module_filepath('mock_file')
+    assert result == '/path/to/mock_file'
+
+    # Test the case where the file does not exist and the function should raise an error
+    mock_isfile.return_value = False
+    with pytest.raises(FileNotFoundError):
+        config.get_module_filepath('non_existent_file')
+
+@patch('os.path.isfile')
+@patch('os.environ')
+@patch('builtins.open', new_callable=mock_open, read_data='mock_file_content')
+def test_load_config(mock_open, mock_environ, mock_isfile):
+    # Test that the function correctly loads the mock configuration file
+    mock_isfile.return_value = True
+    mock_environ.get.return_value = 'mock_file_path'
+    result = config.load_config('mock_file_path')
+    assert result == 'mock_file_content'
+
+    # Test the case where the file does not exist and the function should raise an error
+    mock_isfile.return_value = False
+    with pytest.raises(FileNotFoundError):
+        config.load_config('non_existent_file')
+
+    # Test the case where the environment variable is not set and the function should raise an error
+    mock_environ.get.return_value = None
+    with pytest.raises(EnvironmentError):
+        config.load_config('mock_file_path')
+
+@patch('os.path.isfile')
+@patch('os.environ')
+@patch('builtins.open', new_callable=mock_open, read_data='mock_file_content')
+def test_load_config_key(mock_open, mock_environ, mock_isfile):
+    # Test that the function correctly loads a specific key from the mock configuration file
+    mock_isfile.return_value = True
+    mock_environ.get.return_value = 'mock_file_path'
+    result = config.load_config_key('mock_file_path', 'mock_key')
+    assert result == 'mock_key_value'
+
+    # Test the case where the key does not exist in the configuration file and the function should raise an error
+    with pytest.raises(KeyError):
+        config.load_config_key('mock_file_path', 'non_existent_key')
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