def test_get_feature_names_out():
"""Check get_feature_names_out uses class name as prefix."""
est = LinearDiscriminantAnalysis().fit(X, y)
names_out = est.get_feature_names_out()
class_name_lower = "LinearDiscriminantAnalysis".lower()
expected_names_out = np.array(
[
f"{class_name_lower}{i}"
for i in range(est.explained_variance_ratio_.shape[0])
],
dtype=object,
)
assert_array_equal(names_out, expected_names_out)
