[MRG] Fix test after sklearn update where the text of a Value error changed (#303)

* add contributor guide

* fix test after sklearn update

* fix test after sklearn update

Author: tgnassou

skada/tests/test_utils.py

@@ -421,13 +421,16 @@ def test_check_X_domain_multi_nd():
     check_X_domain(X, sample_domain=sample_domain, allow_nd=True)
 
     # Test with allow_nd=False (should raise an error)
-    with pytest.raises(ValueError, match="Found array with dim 3. None expected <= 2."):
+    with pytest.raises(
+        ValueError, match="Found array with dim 3, while dim <= 2 is required."
+    ):
         check_X_domain(X, sample_domain=sample_domain, allow_nd=False)
 
 
 def test_check_X_y_domain_multi_nd():
     # Create a 3D array for X (10 samples, 2 features, 3 channels)
     X = np.random.rand(10, 2, 3)
+
     # Create a 2D array for y (10 samples, 2 outputs)
     y = np.random.rand(10, 2)
     sample_domain = np.array([1] * 5 + [-1] * 5)
@@ -436,7 +439,9 @@ def test_check_X_y_domain_multi_nd():
     check_X_y_domain(X, y, sample_domain=sample_domain, allow_nd=True)
 
     # Test with allow_nd=False (should raise an error for X)
-    with pytest.raises(ValueError, match="Found array with dim 3. None expected <= 2."):
+    with pytest.raises(
+        ValueError, match="Found array with dim 3, while dim <= 2 is required."
+    ):
         check_X_y_domain(X, y, sample_domain=sample_domain, allow_nd=False)