diff --git a/src/stream_viewer.py b/src/stream_viewer.py
index 74d0eba..20f9b23 100644
--- a/src/stream_viewer.py
+++ b/src/stream_viewer.py
@@ -1,11 +1,7 @@
 from __future__ import annotations
 
 import cv2
-from typing import TypedDict
 
-class StreamConfig(TypedDict):
-    stream_url: str
-    window_name: str
 
 class StreamViewer:
     """
@@ -13,18 +9,22 @@ class StreamViewer:
 
     Attributes:
         stream_url (str): The URL of the video stream.
-        window_name (str): The name of the window where the stream will be displayed.
+        window_name (str): The name of the window where the stream will
+                           be displayed.
     """
 
-    def __init__(self, config: StreamConfig):
+    def __init__(self, stream_url: str, window_name: str = 'Stream Viewer'):
         """
-        Initialises the StreamViewer instance with a stream URL and a window name.
+        Initialises the StreamViewer instance with a stream URL
+        and a window name.
 
         Args:
-            config (StreamConfig): The configuration for the stream viewer.
+            stream_url (str): The URL of the video stream.
+            window_name (str): The name of the window where the stream
+                               will be displayed.
         """
-        self.stream_url = config['stream_url']
-        self.window_name = config['window_name']
+        self.stream_url = stream_url
+        self.window_name = window_name
         self.cap = cv2.VideoCapture(self.stream_url)
 
     def display_stream(self):
@@ -32,7 +32,8 @@ def display_stream(self):
         Displays the video stream in a window.
 
         Continuously captures frames from the video stream and displays them.
-        The loop breaks when 'q' is pressed or if the stream cannot be retrieved.
+        The loop breaks when 'q' is pressed or if the stream cannot be
+        retrieved.
         """
         while True:
             # Capture the next frame from the stream.
@@ -62,11 +63,9 @@ def release_resources(self):
 
 
 if __name__ == '__main__':
-    # Define the stream configuration
-    config: StreamConfig = {
-        'stream_url': 'https://cctv4.kctmc.nat.gov.tw/50204bfc/',
-        'window_name': 'Stream Viewer'
-    }
-    
-    viewer = StreamViewer(config)
+    # Replace 'vide0_url' with your stream URL.
+    video_url = (
+        'https://cctv4.kctmc.nat.gov.tw/50204bfc/'
+    )
+    viewer = StreamViewer(video_url)
     viewer.display_stream()
diff --git a/tests/stream_viewer_test.py b/tests/stream_viewer_test.py
new file mode 100644
index 0000000..5f8ad8f
--- /dev/null
+++ b/tests/stream_viewer_test.py
@@ -0,0 +1,79 @@
+from __future__ import annotations
+
+import unittest
+from unittest.mock import MagicMock
+from unittest.mock import patch
+
+from src.stream_viewer import StreamViewer
+
+
+class TestStreamViewer(unittest.TestCase):
+
+    @patch('src.stream_viewer.cv2.VideoCapture')
+    def test_initialization(self, mock_video_capture):
+        # Initialize StreamViewer with a test URL
+        stream_url = 'https://example.com/stream'
+        viewer = StreamViewer(stream_url)
+
+        # Check if the URL is set correctly
+        self.assertEqual(viewer.stream_url, stream_url)
+
+        # Check if the window name is set correctly
+        self.assertEqual(viewer.window_name, 'Stream Viewer')
+
+        # Check if VideoCapture was called with the correct URL
+        mock_video_capture.assert_called_once_with(stream_url)
+
+    @patch('src.stream_viewer.cv2.VideoCapture')
+    @patch('src.stream_viewer.cv2.imshow')
+    @patch('src.stream_viewer.cv2.waitKey')
+    def test_display_stream(
+        self, mock_wait_key, mock_imshow, mock_video_capture,
+    ):
+        # Mock VideoCapture instance
+        mock_cap_instance = MagicMock()
+        mock_video_capture.return_value = mock_cap_instance
+
+        # Simulate read() returning True with a dummy frame
+        mock_cap_instance.read.side_effect = [
+            (True, MagicMock()), (True, MagicMock()), (False, None),
+        ]
+
+        # Simulate waitKey() returning 'q' to break the loop
+        mock_wait_key.side_effect = [ord('a'), ord('b'), ord('q')]
+
+        # Initialize StreamViewer and call display_stream
+        viewer = StreamViewer('https://example.com/stream')
+        viewer.display_stream()
+
+        # Check if imshow was called correctly
+        self.assertEqual(mock_imshow.call_count, 2)
+
+        # Check if waitKey was called at least twice
+        self.assertGreaterEqual(mock_wait_key.call_count, 2)
+
+        # Check if read was called at least twice
+        self.assertGreaterEqual(mock_cap_instance.read.call_count, 2)
+
+    @patch('src.stream_viewer.cv2.VideoCapture')
+    @patch('src.stream_viewer.cv2.destroyAllWindows')
+    def test_release_resources(
+        self, mock_destroy_all_windows, mock_video_capture,
+    ):
+        # Mock VideoCapture instance
+        mock_cap_instance = MagicMock()
+        mock_video_capture.return_value = mock_cap_instance
+
+        # Initialize StreamViewer and call release_resources
+        viewer = StreamViewer('https://example.com/stream')
+        viewer.release_resources()
+
+        # Check if release was called on VideoCapture instance
+        mock_cap_instance.release.assert_called_once()
+
+        # Check if destroyAllWindows was called
+        mock_destroy_all_windows.assert_called_once()
+
+
+if __name__ == '__main__':
+    unittest.main()