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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