Add skip condition for tests if OpenCV is missing

Author: PierreRaybaut

cdl/tests/__init__.py

@@ -21,9 +21,10 @@
 from __future__ import annotations
 
 import os
-from collections.abc import Generator
 from contextlib import contextmanager
+from typing import Generator
 
+import pytest
 from guidata.guitest import run_testlauncher
 
 import cdl.config  # Loading icons
@@ -81,6 +82,17 @@ def cdltest_app_context(
                 win.close()
 
 
+@contextmanager
+def skip_if_opencv_missing() -> Generator[None, None, None]:
+    """Skip test if OpenCV is not available"""
+    try:
+        yield
+    except ImportError as exc:
+        if "cv2" in str(exc).lower():
+            pytest.skip("OpenCV not available, skipping test")
+        raise exc
+
+
 def take_plotwidget_screenshot(panel: SignalPanel | ImagePanel, name: str) -> None:
     """Eventually takes plotwidget screenshot (only in screenshot mode)"""
     if execenv.screenshot:

cdl/tests/features/images/blobs_app_test.py

@@ -9,7 +9,7 @@
 
 import cdl.param
 from cdl.obj import create_image
-from cdl.tests import cdltest_app_context
+from cdl.tests import cdltest_app_context, skip_if_opencv_missing
 from cdl.tests.data import get_test_image
 
 
@@ -32,7 +32,8 @@ def test_blobs():
             image = create_image(name, data)
             image.add_label_with_title()
             panel.add_object(image)
-            compute_method(param)
+            with skip_if_opencv_missing():
+                compute_method(param)
 
         # Testing distribute_on_grid and reset_positions
         # ==============================================

cdl/tests/scenarios/example_app_test.py

@@ -13,6 +13,7 @@
 import cdl.obj as dlo
 import cdl.param as dlp
 from cdl.proxy import proxy_context
+from cdl.tests import skip_if_opencv_missing
 from cdl.tests.data import get_test_image
 
 
@@ -39,7 +40,8 @@ def test_example_app():
             filter_by_circularity=True,
             min_circularity=0.2,
         )
-        proxy.compute_blob_opencv(param)
+        with skip_if_opencv_missing():
+            proxy.compute_blob_opencv(param)
 
 
 if __name__ == "__main__":