Fix image search test case when API key is missing

src/slidedeckai/helpers/image_search.py

@@ -20,7 +20,8 @@ load_dotenv()
 if not os.getenv('PEXEL_API_KEY'):
     warnings.warn(
         'PEXEL_API_KEY environment variable is not set. '
-        'Image search functionality will not work without it.'
+        'Image search functionality will not work without it.',
+        stacklevel=2
     )
 
 PEXELS_URL = 'https://api.pexels.com/v1/search'

tests/unit/test_image_search.py

@@ -112,6 +112,10 @@ def test_get_photo_url_from_api_response_selects_large_and_original(monkeypatch)
         {'url': 'https://pexels.com/photo/3', 'src': {'large': 'https://images/3_large.jpg'}},
     ]
 
+    # Ensure the Pexels API key is present so the helper will attempt to select
+    # and return photo URLs rather than early-returning (None, None).
+    monkeypatch.setenv('PEXEL_API_KEY', 'akey')
+
     # Force selection of index 1 (second photo) which only has 'original'
     monkeypatch.setattr(image_search.random, 'choice', lambda seq: 1)