def test_pcoa_biplot(self): features = pd.DataFrame([[1, 0], [3, 0.1], [8, -0.4]], index=['S1', 'S2', 'S3'], columns=['positive', 'neither']) expected = skbio.stats.ordination.pcoa_biplot(self.ordination, features) observed = pcoa_biplot(self.ordination, features) skbio.util.assert_ordination_results_equal(observed, expected, ignore_directionality=True)