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DenseNodeRelChainPositionTest.java
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DenseNodeRelChainPositionTest.java
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.core;
import org.junit.Rule;
import org.junit.Test;
import org.neo4j.graphdb.Direction;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.helpers.collection.Iterables;
import org.neo4j.test.rule.DatabaseRule;
import org.neo4j.test.rule.ImpermanentDatabaseRule;
import static org.junit.Assert.assertEquals;
public class DenseNodeRelChainPositionTest
{
@Rule
public final DatabaseRule db = new ImpermanentDatabaseRule();
/*
* Tests for a particular bug with dense nodes. It used to be that if a dense node had relationships
* for only one direction, if a request for relationships of the other direction was made, no relationships
* would be returned, ever.
*/
@Test
public void givenDenseNodeWhenAskForWrongDirectionThenIncorrectNrOfRelsReturned() throws Exception
{
// Given
final int denseNodeThreshold =
Integer.parseInt( GraphDatabaseSettings.dense_node_threshold.getDefaultValue() )
+ 1 // We must be over the dense node threshold for the bug to manifest
;
Node node1;
try ( Transaction tx = db.beginTx() )
{
node1 = db.createNode();
Node node2 = db.createNode();
for ( int i = 0; i < denseNodeThreshold; i++ )
{
node1.createRelationshipTo( node2, RelationshipType.withName( "FOO" ) );
}
tx.success();
}
// When/Then
try ( Transaction ignored = db.beginTx() )
{
Node node1b = db.getNodeById( node1.getId() );
Iterable<Relationship> rels = node1b.getRelationships( Direction.INCOMING );
assertEquals( 0, Iterables.count( rels ) );
Iterable<Relationship> rels2 = node1b.getRelationships( Direction.OUTGOING );
assertEquals( denseNodeThreshold, Iterables.count( rels2 ) );
}
}
}