diff --git a/app/ui_cr/__init__.py b/app/ui_cr/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/app/ui_cr/app.py b/app/ui_cr/app.py
index 36bce32..f77abf1 100644
--- a/app/ui_cr/app.py
+++ b/app/ui_cr/app.py
@@ -94,7 +94,10 @@ def entry():
                 app.logger.debug("Function response code: %s", func_response.status_code)
                 app.logger.debug("Function response text: %s", func_response.text)
                 translation = func_response.text
+            else:
+                app.logger.error("Image encoding failed.")                
 
+    app.logger.debug(f"Final translation: {translation}")
     return render_template('index.html',
                            languages=app.languages,
                            message=message,
diff --git a/app/ui_cr/tests/__init__.py b/app/ui_cr/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/app/ui_cr/tests/test_app.py b/app/ui_cr/tests/test_app.py
new file mode 100644
index 0000000..c33dcc6
--- /dev/null
+++ b/app/ui_cr/tests/test_app.py
@@ -0,0 +1,91 @@
+import os
+import pytest
+import logging
+from unittest.mock import patch, MagicMock
+from io import BytesIO
+from PIL import Image
+
+@pytest.fixture
+def app():
+    """Flask test app configuration with logging enabled."""
+    from ui_cr.app import app  # Import the app
+    app.config['TESTING'] = True
+    app.logger.setLevel(logging.DEBUG)  # Enable debug logging
+    
+    # Enable Flask's logger propagation to the root logger
+    app.logger.propagate = True
+
+    return app
+
+@pytest.fixture
+def client(app):
+    """Fixture to create a test client for the Flask app."""
+    return app.test_client()
+
+@patch('ui_cr.app.make_authorized_post_request')
+def test_entry_post_valid_image(mock_make_post_request, client, app):
+    """Test the POST request with a valid image and form."""
+
+    # Create a test image and save it to a BytesIO object
+    img_io = BytesIO()
+    test_image = Image.new('RGB', (10, 10), color='red')
+    test_image.save(img_io, format='JPEG')
+    img_io.seek(0)  # Move to the start of the BytesIO object
+
+    # Ensure the BACKEND_GCF environment variable is set for this test
+    backend_gcf = os.environ.get('BACKEND_GCF', 'undefined')
+    app.logger.debug(f"BACKEND_GCF: {backend_gcf}")
+
+    # Mocking the response from the backend function
+    mock_response = MagicMock()
+    mock_response.status_code = 200
+    mock_response.text = "Test translated text"
+    mock_make_post_request.return_value = mock_response
+
+    # Create a mock image file to simulate form data
+    img_data = (img_io, 'test_image.jpg')
+
+    # Send POST request
+    response = client.post(
+        '/',
+        data={'file': img_data, 'to_lang': 'en'},
+        content_type='multipart/form-data'
+    )
+
+    # Check the response status
+    assert response.status_code == 200
+
+    # Debugging logs
+    app.logger.debug(f"Test response data: {response.data}")
+
+    # Check if the mock function was called, ensuring the image was processed correctly
+    try:
+        mock_make_post_request.assert_called_once()
+        called_args, called_kwargs = mock_make_post_request.call_args
+
+        # Check that the arguments are as expected
+        assert called_kwargs['endpoint'] == backend_gcf
+        assert called_kwargs['to_lang'] == 'en'
+        assert called_kwargs['filename'] == 'test_image.jpg'
+        assert called_kwargs['content_type'] in ['image/jpeg', 'image/png']
+        
+        # Optionally check that image_data is not empty
+        assert called_kwargs['image_data'], "Image data is empty"
+
+        # Add additional check for content length
+        assert len(called_kwargs['image_data']) > 0, "Image data length is zero"
+        
+        # Log the mock function call arguments
+        app.logger.debug(f"make_authorized_post_request called with: {called_kwargs}")
+
+    except AssertionError as e:
+        app.logger.error(f"make_authorized_post_request was not called correctly: {str(e)}")
+        raise e
+
+    # Check that there are no flash error messages
+    assert b"No file selected for uploading." not in response.data
+    assert b"Unable to process image." not in response.data
+    assert b"Unsupported image format." not in response.data
+
+    # Check for the translation text in the response
+    assert b"Test translated text" in response.data