Github user andralungu commented on a diff in the pull request:
https://github.com/apache/flink/pull/807#discussion_r31932709
--- Diff:
flink-staging/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/GraphOperationsITCase.java
---
@@ -266,6 +266,47 @@ public void testUnion() throws Exception {
"6,1,61\n";
}
+ @Test
+ public void testDifference() throws Exception {
+ /*
+ * Test difference()
+ */
+ final ExecutionEnvironment env =
ExecutionEnvironment.getExecutionEnvironment();
+
+ Graph<Long, Long, Long> graph =
Graph.fromDataSet(TestGraphUtils.getLongLongVertexData(env),
+ TestGraphUtils.getLongLongEdgeData(env), env);
+
+ List<Vertex<Long, Long>> vertices = new ArrayList<Vertex<Long,
Long>>();
+ List<Edge<Long, Long>> edges = new ArrayList<Edge<Long, Long>>();
+
+ vertices.remove(1);
+ vertices.remove(3);
+ vertices.remove(4);
+
+ vertices.add(new Vertex<Long,Long>(6L,6L));
+
+ edges.remove(0);
+ edges.remove(2);
+ edges.remove(3);
+ edges.remove(4);
+ edges.remove(5);
+ edges.remove(6);
+
+ edges.add(new Edge<Long, Long>(6L,1L,61L));
+ edges.add(new Edge<Long, Long>(6L,3L,63L));
+
+ graph = graph.difference(Graph.fromCollection(vertices, edges,
env));
+
+ graph.getEdges().writeAsCsv(resultPath);
+ graph.getVertices().writeAsCsv(resultPath);
--- End diff --
The graph.getVertices() should actually be in a different test; that way
you could change the expected result and see that the vertices you get are
actually the ones you expected.
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