def test_feature_names_out():
"""Check `get_feature_names_out` for `Birch`."""
X, _ = make_blobs(n_samples=80, n_features=4, random_state=0)
brc = Birch(n_clusters=4)
brc.fit(X)
n_clusters = brc.subcluster_centers_.shape[0]
names_out = brc.get_feature_names_out()
assert_array_equal([f"birch{i}" for i in range(n_clusters)], names_out)
