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VoteStateTest.java
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VoteStateTest.java
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/*
* Copyright (c) 2002-2016 "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 Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.coreedge.raft.state;
import org.junit.Test;
import org.neo4j.coreedge.raft.state.vote.VoteState;
import org.neo4j.coreedge.server.AdvertisedSocketAddress;
import org.neo4j.coreedge.server.CoreMember;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
public class VoteStateTest
{
@Test
public void shouldStoreVote() throws Exception
{
// given
VoteState<CoreMember> voteState = new VoteState<>();
CoreMember member = new CoreMember( new AdvertisedSocketAddress( "host1:1001" ),
new AdvertisedSocketAddress( "host1:2001" ) );
// when
voteState.update( member, 0 );
// then
assertEquals( member, voteState.votedFor() );
}
@Test
public void shouldStartWithNoVote() throws Exception
{
// given
VoteState<CoreMember> voteState = new VoteState<>();
// then
assertNull( voteState.votedFor() );
}
@Test
public void shouldUpdateVote() throws Exception
{
// given
VoteState<CoreMember> voteState = new VoteState<>();
CoreMember member1 = new CoreMember( new AdvertisedSocketAddress( "host1:1001" ),
new AdvertisedSocketAddress( "host1:2001" ) );
CoreMember member2 = new CoreMember( new AdvertisedSocketAddress( "host2:1001" ),
new AdvertisedSocketAddress( "host2:2001" ) );
// when
voteState.update( member1, 0 );
voteState.update( member2, 1 );
// then
assertEquals( member2, voteState.votedFor() );
}
@Test
public void shouldClearVote() throws Exception
{
// given
VoteState<CoreMember> voteState = new VoteState<>();
CoreMember member = new CoreMember( new AdvertisedSocketAddress( "host1:1001" ),
new AdvertisedSocketAddress( "host1:2001" ) );
voteState.update( member, 0 );
// when
voteState.update( null, 1 );
// then
assertNull( voteState.votedFor() );
}
@Test
public void shouldNotUpdateVoteForSameTerm() throws Exception
{
// given
VoteState<CoreMember> voteState = new VoteState<>();
CoreMember member1 = new CoreMember( new AdvertisedSocketAddress( "host1:1001" ),
new AdvertisedSocketAddress( "host1:2001" ) );
CoreMember member2 = new CoreMember( new AdvertisedSocketAddress( "host2:1001" ),
new AdvertisedSocketAddress( "host2:2001" ) );
voteState.update( member1, 0 );
try
{
// when
voteState.update( member2, 0 );
fail( "Should have thrown IllegalArgumentException" );
}
catch ( IllegalArgumentException expected )
{
// expected
}
}
@Test
public void shouldNotClearVoteForSameTerm() throws Exception
{
// given
VoteState<CoreMember> voteState = new VoteState<>();
CoreMember member1 = new CoreMember( new AdvertisedSocketAddress( "host1:1001" ),
new AdvertisedSocketAddress( "host1:2001" ) );
voteState.update( member1, 0 );
try
{
// when
voteState.update( null, 0 );
fail( "Should have thrown IllegalArgumentException" );
}
catch ( IllegalArgumentException expected )
{
// expected
}
}
@Test
public void shouldReportNoUpdateWhenVoteStateUnchanged() throws Exception
{
// given
VoteState<CoreMember> voteState = new VoteState<>();
CoreMember member1 = new CoreMember( new AdvertisedSocketAddress( "host1:1001" ),
new AdvertisedSocketAddress( "host1:2001" ) );
CoreMember member2 = new CoreMember( new AdvertisedSocketAddress( "host2:1001" ),
new AdvertisedSocketAddress( "host2:2001" ) );
// when
assertTrue( voteState.update( null, 0 ) );
assertFalse( voteState.update( null, 0 ) );
assertTrue( voteState.update( member1, 0 ) );
assertFalse( voteState.update( member1, 0 ) );
assertTrue( voteState.update( member2, 1 ) );
assertFalse( voteState.update( member2, 1 ) );
}
}