[MRG] Distance calculation bug solve (#306)

* solve bug

* Weights & docs

* tests for dist

* test dist

* pep8

1 files changed, 20 insertions, 0 deletions

diff --git a/test/test_utils.py b/test/test_utils.py
index 40f4e49..6b476b2 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -117,6 +117,26 @@ def test_dist():
     np.testing.assert_allclose(D, D2, atol=1e-14)
     np.testing.assert_allclose(D, D3, atol=1e-14)
 
+    # tests that every metric runs correctly
+    metrics_w = [
+        'braycurtis', 'canberra', 'chebyshev', 'cityblock', 'correlation', 'cosine', 'dice',
+        'euclidean', 'hamming', 'jaccard', 'kulsinski',
+        'matching', 'minkowski', 'rogerstanimoto', 'russellrao',
+        'sokalmichener', 'sokalsneath', 'sqeuclidean', 'wminkowski', 'yule'
+    ]  # those that support weights
+    metrics = ['mahalanobis', 'seuclidean']  # do not support weights depending on scipy's version
+
+    for metric in metrics_w:
+        print(metric)
+        ot.dist(x, x, metric=metric, p=3, w=np.random.random((2, )))
+    for metric in metrics:
+        print(metric)
+        ot.dist(x, x, metric=metric, p=3)
+
+    # weighted minkowski but with no weights
+    with pytest.raises(ValueError):
+        ot.dist(x, x, metric="wminkowski")
+
 
 def test_dist_backends(nx):