add test for error message in eccentricity function

1 files changed, 5 insertions, 2 deletions

diff --git a/networkx/algorithms/tests/test_distance_measures.py b/networkx/algorithms/tests/test_distance_measures.py
index 1004bf4d..dfdb24bd 100644
--- a/networkx/algorithms/tests/test_distance_measures.py
+++ b/networkx/algorithms/tests/test_distance_measures.py
@@ -62,8 +62,11 @@ class TestDistance:
         e = networkx.eccentricity(G)
 
     @raises(networkx.NetworkXError)
-    def test_eccentricity_invalid(self):
+    def test_eccentricity_undirected_not_connected(self):
         G=networkx.Graph([(1,2),(3,4)])
         e = networkx.eccentricity(G,sp=1)
 
-
+    @raises(networkx.NetworkXError)
+    def test_eccentricity_directed_weakly_connected(self):
+        DG = networkx.DiGraph([(1,2),(1,3)])
+        networkx.eccentricity(DG)