fix test and check that RNG <= D

Author: dcodrut

libpysal/weights/tests/test_gabriel.py

@@ -39,8 +39,12 @@ def test_rng():
 
     assert e.neighbors == f.neighbors
 
+    # RNG should be a subgraph of Delaunay
+    for k, neighbors in e.neighbors.items():
+        assert set(neighbors) <= set(dty[k])
+
     assert e[1] != dty[1]
-    assert list(e[1].keys()) == [0, 3, 6, 30, 38]
+    assert list(e[1].keys()) == [0, 3]
     for focal, neighbors in e.neighbors.items():
         dneighbors = dty[focal]
         assert set(neighbors) <= set(dneighbors)