gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/decoration/ReferenceElementStrategyTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.tinkerpop.gremlin.process.traversal.strategy.decoration;

import org.apache.tinkerpop.gremlin.process.traversal.Traversal;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
import org.apache.tinkerpop.gremlin.process.traversal.strategy.finalization.ReferenceElementStrategy;
import org.apache.tinkerpop.gremlin.process.traversal.util.TraversalHelper;
import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.apache.tinkerpop.gremlin.structure.util.empty.EmptyGraph;
import org.junit.Test;

import static org.apache.tinkerpop.gremlin.process.traversal.AnonymousTraversalSource.traversal;
import static org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.in;
import static org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.out;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.core.Is.is;
import static org.junit.Assert.assertEquals;

/**
 * @author Stephen Mallette (http://stephen.genoprime.com)
 */
public class ReferenceElementStrategyTest {

    private static final GraphTraversalSource g = traversal().withGraph(EmptyGraph.instance()).
            withStrategies(ReferenceElementStrategy.instance());

    @Test
    public void shouldAppendOneReferenceElementStep() {
        final Traversal<Vertex, ?> t = g.V().union(out(), in()).groupCount();
        t.asAdmin().applyStrategies();
        assertThat((t.asAdmin().getEndStep() instanceof ReferenceElementStrategy.ReferenceElementStep), is(true));
        assertEquals(1, TraversalHelper.getStepsOfAssignableClass(ReferenceElementStrategy.ReferenceElementStep.class, t.asAdmin()).size());
    }
}