Skip test if an optional dependency is not installed

Author: dnerini

pysteps/tests/test_blending_steps.py

@@ -50,6 +50,8 @@ def test_steps_blending(
     decomposed_nwp,
     expected_n_ens_members,
 ):
+    pytest.importorskip("cv2")
+
     ###
     # The input data
     ###

pysteps/tests/test_feature.py

@@ -9,6 +9,11 @@
 
 @pytest.mark.parametrize(arg_names, arg_values)
 def test_feature(method, max_num_features):
+    if method == "blob":
+        pytest.importorskip("skimage")
+    if method == "shitomasi":
+        pytest.importorskip("cv2")
+
     input_field, _ = get_precipitation_fields(0, 0, True, True, None, "mch")
 
     detector = feature.get_method(method)

pysteps/tests/test_nowcasts_lagrangian_probability.py

@@ -34,6 +34,8 @@ def test_numerical_example():
 
 def test_real_case():
     """"""
+    pytest.importorskip("cv2")
+
     # inputs
     precip, metadata = get_precipitation_fields(
         num_prev_files=2,

pysteps/tests/test_nowcasts_steps.py

@@ -94,6 +94,9 @@ def test_steps_skill(
 
 def test_steps_callback(tmp_path):
     """Test STEPS callback functionality to export the output as a netcdf."""
+
+    pytest.importorskip("netCDF4")
+
     n_ens_members = 2
     n_timesteps = 3
 

pysteps/tests/test_plt_motionfields.py

@@ -31,7 +31,7 @@
 def test_visualization_motionfields_quiver(
     source, axis, step, quiver_kwargs, map_kwargs, upscale, pass_geodata
 ):
-
+    pytest.importorskip("cv2")
     if source is not None:
         fields, geodata = get_precipitation_fields(0, 2, False, True, upscale, source)
         if not pass_geodata:
@@ -76,7 +76,7 @@ def test_visualization_motionfields_quiver(
 def test_visualization_motionfields_streamplot(
     source, axis, streamplot_kwargs, map_kwargs, upscale, pass_geodata
 ):
-
+    pytest.importorskip("cv2")
     if source is not None:
         fields, geodata = get_precipitation_fields(0, 2, False, True, upscale, source)
         if not pass_geodata: