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DefaultComparatorTopTableTest.java
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DefaultComparatorTopTableTest.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 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.cypher.internal.compatibility.v3_3.runtime.slotted;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import java.util.Comparator;
import java.util.Iterator;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
public class DefaultComparatorTopTableTest
{
private static Long[] testValues = new Long[]{7L, 4L, 5L, 0L, 3L, 4L, 8L, 6L, 1L, 9L, 2L};
private static long[] expectedValues = new long[]{0L, 1L, 2L, 3L, 4L, 4L, 5L, 6L, 7L, 8L, 9L};
private static Comparator<Long> comparator = new Comparator<Long>()
{
@Override
public int compare( Long x, Long y )
{
return (x < y) ? -1 : ((x == y) ? 0 : 1);
}
};
@Rule
public final ExpectedException exception = ExpectedException.none();
@Test
public void shouldHandleAddingMoreValuesThanCapacity()
{
DefaultComparatorTopTable table = new DefaultComparatorTopTable( comparator, 7 );
for ( Long i : testValues )
{
table.add( i );
}
table.sort();
Iterator<Object> iterator = table.iterator();
for ( int i = 0; i < 7; i++ )
{
assertTrue( iterator.hasNext() );
long value = (long) iterator.next();
assertEquals( expectedValues[i], value );
}
assertFalse( iterator.hasNext() );
}
@Test
public void shouldHandleWhenNotCompletelyFilledToCapacity()
{
DefaultComparatorTopTable table = new DefaultComparatorTopTable( comparator, 20 );
for ( Long i : testValues )
{
table.add( i );
}
table.sort();
Iterator<Object> iterator = table.iterator();
for ( int i = 0; i < testValues.length; i++ )
{
assertTrue( iterator.hasNext() );
long value = (long) iterator.next();
assertEquals( expectedValues[i], value );
}
assertFalse( iterator.hasNext() );
}
@Test
public void shouldHandleWhenEmpty()
{
DefaultComparatorTopTable table = new DefaultComparatorTopTable( comparator, 10 );
table.sort();
Iterator<Object> iterator = table.iterator();
assertFalse( iterator.hasNext() );
}
@Test
public void shouldThrowOnInitializeToZeroCapacity()
{
exception.expect( IllegalArgumentException.class );
new DefaultComparatorTopTable( comparator, 0 );
}
@Test
public void shouldThrowOnInitializeToNegativeCapacity()
{
exception.expect( IllegalArgumentException.class );
new DefaultComparatorTopTable( comparator, -1 );
}
@Test
public void shouldThrowOnSortNotCalledBeforeIterator()
{
DefaultComparatorTopTable table = new DefaultComparatorTopTable( comparator, 5 );
for ( Long i : testValues )
{
table.add( i );
}
// We forgot to call sort() here...
exception.expect( IllegalStateException.class );
table.iterator();
}
}