/*
* Copyright (c) 2013 Pantheon Technologies s.r.o. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.openflowjava.protocol.impl.util;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.UnpooledByteBufAllocator;
import java.util.ArrayList;
import java.util.List;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.opendaylight.openflowjava.protocol.api.extensibility.OFSerializer;
import org.opendaylight.openflowjava.protocol.api.extensibility.SerializerRegistry;
import org.opendaylight.openflowjava.protocol.api.keys.MessageTypeKey;
import org.opendaylight.openflowjava.protocol.api.util.EncodeConstants;
import org.opendaylight.openflowjava.protocol.impl.serialization.SerializerRegistryImpl;
import org.opendaylight.openflowjava.util.ByteBufUtils;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Address;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6FlowLabel;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.approved.extensions.rev160802.TcpFlags;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.approved.extensions.rev160802.oxm.container.match.entry.value.experimenter.id._case.TcpFlagsBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.augments.rev150225.oxm.container.match.entry.value.ExperimenterIdCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.augments.rev150225.oxm.container.match.entry.value.experimenter.id._case.ExperimenterBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.common.types.rev130731.ExperimenterId;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.common.types.rev130731.StandardMatchType;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.ExperimenterClass;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.Ipv4Src;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.Ipv6Dst;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.Ipv6Flabel;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.Ipv6NdTarget;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.Ipv6Src;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.MatchField;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.OpenflowBasicClass;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.OxmMatchType;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entries.grouping.MatchEntry;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entries.grouping.MatchEntryBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entry.value.grouping.match.entry.value.Ipv4SrcCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entry.value.grouping.match.entry.value.Ipv6DstCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entry.value.grouping.match.entry.value.Ipv6FlabelCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entry.value.grouping.match.entry.value.Ipv6NdTargetCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entry.value.grouping.match.entry.value.Ipv6SrcCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entry.value.grouping.match.entry.value.ipv4.src._case.Ipv4SrcBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entry.value.grouping.match.entry.value.ipv6.dst._case.Ipv6DstBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entry.value.grouping.match.entry.value.ipv6.flabel._case.Ipv6FlabelBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entry.value.grouping.match.entry.value.ipv6.nd.target._case.Ipv6NdTargetBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.entry.value.grouping.match.entry.value.ipv6.src._case.Ipv6SrcBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.grouping.Match;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev150225.match.grouping.MatchBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @author michal.polkorab
*
*/
public class OF13MatchSerializerTest {
private static final Logger LOG = LoggerFactory
.getLogger(OF13MatchSerializerTest.class);
private SerializerRegistry registry;
private OFSerializer<Match> matchSerializer;
/**
* Initializes serializer table and stores correct factory in field
*/
@Before
public void startUp() {
registry = new SerializerRegistryImpl();
registry.init();
matchSerializer = registry.getSerializer(
new MessageTypeKey<>(EncodeConstants.OF13_VERSION_ID, Match.class));
}
/**
* Test for correct serialization of Ipv4Address match entry
*/
@Test
public void testIpv4Src() {
MatchBuilder builder = new MatchBuilder();
builder.setType(OxmMatchType.class);
List<MatchEntry> entries = new ArrayList<>();
MatchEntryBuilder entriesBuilder = new MatchEntryBuilder();
entriesBuilder.setOxmClass(OpenflowBasicClass.class);
entriesBuilder.setOxmMatchField(Ipv4Src.class);
entriesBuilder.setHasMask(false);
Ipv4SrcCaseBuilder ipv4SrcCaseBuilder = new Ipv4SrcCaseBuilder();
Ipv4SrcBuilder ipv4SrcBuilder = new Ipv4SrcBuilder();
ipv4SrcBuilder.setIpv4Address(new Ipv4Address("1.2.3.4"));
ipv4SrcCaseBuilder.setIpv4Src(ipv4SrcBuilder.build());
entriesBuilder.setMatchEntryValue(ipv4SrcCaseBuilder.build());
entries.add(entriesBuilder.build());
builder.setMatchEntry(entries);
Match match = builder.build();
ByteBuf out = UnpooledByteBufAllocator.DEFAULT.buffer();
matchSerializer.serialize(match, out);
Assert.assertEquals("Wrong type", 1, out.readUnsignedShort());
out.skipBytes(EncodeConstants.SIZE_OF_SHORT_IN_BYTES);
Assert.assertEquals("Wrong class", 0x8000, out.readUnsignedShort());
Assert.assertEquals("Wrong field and mask", 22, out.readUnsignedByte());
out.skipBytes(EncodeConstants.SIZE_OF_BYTE_IN_BYTES);
Assert.assertEquals("Wrong ip address (first number)", 1, out.readUnsignedByte());
Assert.assertEquals("Wrong ip address (second number)", 2, out.readUnsignedByte());
Assert.assertEquals("Wrong ip address (third number)", 3, out.readUnsignedByte());
Assert.assertEquals("Wrong ip address (fourth number)", 4, out.readUnsignedByte());
}
/**
* Test for correct serialization of Ipv6Address match entry
*/
@Test
public void testIpv6Various() {
MatchBuilder builder = new MatchBuilder();
builder.setType(OxmMatchType.class);
List<MatchEntry> entries = new ArrayList<>();
// ipv6 match entry with correct Ipv6 address
MatchEntryBuilder entriesBuilder = new MatchEntryBuilder();
entriesBuilder.setOxmClass(OpenflowBasicClass.class);
entriesBuilder.setOxmMatchField(Ipv6Src.class);
entriesBuilder.setHasMask(false);
Ipv6SrcCaseBuilder ipv6SrcCaseBuilder = new Ipv6SrcCaseBuilder();
Ipv6SrcBuilder ipv6SrcBuilder = new Ipv6SrcBuilder();
ipv6SrcBuilder.setIpv6Address(new Ipv6Address("1:2:3:4:5:6:7:8"));
ipv6SrcCaseBuilder.setIpv6Src(ipv6SrcBuilder.build());
entriesBuilder.setMatchEntryValue(ipv6SrcCaseBuilder.build());
entries.add(entriesBuilder.build());
// ipv6 match entry with abbreviated Ipv6 address
entriesBuilder = new MatchEntryBuilder();
entriesBuilder.setOxmClass(OpenflowBasicClass.class);
entriesBuilder.setOxmMatchField(Ipv6NdTarget.class);
entriesBuilder.setHasMask(false);
Ipv6NdTargetCaseBuilder ipv6NdTargetCaseBuilder = new Ipv6NdTargetCaseBuilder();
Ipv6NdTargetBuilder ipv6NdTargetBuilder = new Ipv6NdTargetBuilder();
ipv6NdTargetBuilder.setIpv6Address(new Ipv6Address("1:2::6:7:8"));
ipv6NdTargetCaseBuilder.setIpv6NdTarget(ipv6NdTargetBuilder.build());
entriesBuilder.setMatchEntryValue(ipv6NdTargetCaseBuilder.build());
entries.add(entriesBuilder.build());
// ipv6 match entry with abbreviated Ipv6 address
entriesBuilder = new MatchEntryBuilder();
entriesBuilder.setOxmClass(OpenflowBasicClass.class);
entriesBuilder.setOxmMatchField(Ipv6Dst.class);
entriesBuilder.setHasMask(false);
Ipv6DstCaseBuilder ipv6DstCaseBuilder = new Ipv6DstCaseBuilder();
Ipv6DstBuilder ipv6DstBuilder = new Ipv6DstBuilder();
ipv6DstBuilder.setIpv6Address(new Ipv6Address("1::8"));
ipv6DstCaseBuilder.setIpv6Dst(ipv6DstBuilder.build());
entriesBuilder.setMatchEntryValue(ipv6DstCaseBuilder.build());
entries.add(entriesBuilder.build());
// ipv6 match entry with abbreviated Ipv6 address
entriesBuilder = new MatchEntryBuilder();
entriesBuilder.setOxmClass(OpenflowBasicClass.class);
entriesBuilder.setOxmMatchField(Ipv6Dst.class);
entriesBuilder.setHasMask(false);
ipv6DstCaseBuilder = new Ipv6DstCaseBuilder();
ipv6DstBuilder = new Ipv6DstBuilder();
ipv6DstBuilder.setIpv6Address(new Ipv6Address("::1"));
ipv6DstCaseBuilder.setIpv6Dst(ipv6DstBuilder.build());
entriesBuilder.setMatchEntryValue(ipv6DstCaseBuilder.build());
entries.add(entriesBuilder.build());
// ipv6 match entry with abbreviated Ipv6 address
entriesBuilder = new MatchEntryBuilder();
entriesBuilder.setOxmClass(OpenflowBasicClass.class);
entriesBuilder.setOxmMatchField(Ipv6Dst.class);
entriesBuilder.setHasMask(false);
ipv6DstCaseBuilder = new Ipv6DstCaseBuilder();
ipv6DstBuilder = new Ipv6DstBuilder();
ipv6DstBuilder.setIpv6Address(new Ipv6Address("::"));
ipv6DstCaseBuilder.setIpv6Dst(ipv6DstBuilder.build());
entriesBuilder.setMatchEntryValue(ipv6DstCaseBuilder.build());
entries.add(entriesBuilder.build());
builder.setMatchEntry(entries);
Match match = builder.build();
ByteBuf out = UnpooledByteBufAllocator.DEFAULT.buffer();
matchSerializer.serialize(match, out);
Assert.assertEquals("Wrong type", 1, out.readUnsignedShort());
out.skipBytes(EncodeConstants.SIZE_OF_SHORT_IN_BYTES);
Assert.assertEquals("Wrong class", 0x8000, out.readUnsignedShort());
Assert.assertEquals("Wrong field and mask", 52, out.readUnsignedByte());
Assert.assertEquals("Wrong entry length", 16, out.readUnsignedByte());
Assert.assertEquals("Wrong ipv6 address", 1, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 2, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 3, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 4, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 5, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 6, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 7, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 8, out.readUnsignedShort());
Assert.assertEquals("Wrong class", 0x8000, out.readUnsignedShort());
Assert.assertEquals("Wrong field and mask", 62, out.readUnsignedByte());
Assert.assertEquals("Wrong entry length", 16, out.readUnsignedByte());
Assert.assertEquals("Wrong ipv6 address", 1, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 2, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 6, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 7, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 8, out.readUnsignedShort());
Assert.assertEquals("Wrong class", 0x8000, out.readUnsignedShort());
Assert.assertEquals("Wrong field and mask", 54, out.readUnsignedByte());
Assert.assertEquals("Wrong entry length", 16, out.readUnsignedByte());
Assert.assertEquals("Wrong ipv6 address", 1, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 8, out.readUnsignedShort());
Assert.assertEquals("Wrong class", 0x8000, out.readUnsignedShort());
Assert.assertEquals("Wrong field and mask", 54, out.readUnsignedByte());
Assert.assertEquals("Wrong entry length", 16, out.readUnsignedByte());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 1, out.readUnsignedShort());
Assert.assertEquals("Wrong class", 0x8000, out.readUnsignedShort());
Assert.assertEquals("Wrong field and mask", 54, out.readUnsignedByte());
Assert.assertEquals("Wrong entry length", 16, out.readUnsignedByte());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong ipv6 address", 0, out.readUnsignedShort());
}
/**
* Test for correct serialization of incorrect Ipv6Address match entry
*/
@Test(expected=IllegalArgumentException.class)
public void testIpv6Incorrect() {
MatchBuilder builder = new MatchBuilder();
builder.setType(OxmMatchType.class);
List<MatchEntry> entries = new ArrayList<>();
// ipv6 match entry with incorrect Ipv6 address
MatchEntryBuilder entriesBuilder = new MatchEntryBuilder();
entriesBuilder.setOxmClass(OpenflowBasicClass.class);
entriesBuilder.setOxmMatchField(Ipv6Src.class);
entriesBuilder.setHasMask(false);
Ipv6SrcCaseBuilder ipv6SrcCaseBuilder = new Ipv6SrcCaseBuilder();
Ipv6SrcBuilder ipv6SrcBuilder = new Ipv6SrcBuilder();
ipv6SrcBuilder.setIpv6Address(new Ipv6Address("1:2::::8"));
ipv6SrcCaseBuilder.setIpv6Src(ipv6SrcBuilder.build());
entriesBuilder.setMatchEntryValue(ipv6SrcCaseBuilder.build());
entries.add(entriesBuilder.build());
builder.setMatchEntry(entries);
Match match = builder.build();
ByteBuf out = UnpooledByteBufAllocator.DEFAULT.buffer();
matchSerializer.serialize(match, out);
}
/**
* Test for correct serialization of Ipv4Address match entry
*/
@Test
public void testIpv6Flabel() {
Match match = buildIpv6FLabelMatch(0x0f9e8dL, false, null);
ByteBuf out = UnpooledByteBufAllocator.DEFAULT.buffer();
matchSerializer.serialize(match, out);
Assert.assertEquals("Wrong type", 1, out.readUnsignedShort());
out.skipBytes(EncodeConstants.SIZE_OF_SHORT_IN_BYTES);
Assert.assertEquals("Wrong class", 0x8000, out.readUnsignedShort());
Assert.assertEquals("Wrong field and mask", 56, out.readUnsignedByte());
out.skipBytes(EncodeConstants.SIZE_OF_BYTE_IN_BYTES);
byte[] label = new byte[4];
out.readBytes(label);
LOG.debug("label: {}", ByteBufUtils.bytesToHexString(label));
Assert.assertArrayEquals("Wrong ipv6FLabel", new byte[]{0, 0x0f, (byte) 0x9e, (byte) 0x8d}, label);
}
/**
* Test for correct serialization of Ipv4Address match entry
*/
@Test
public void testIpv6FlabelWithMask() {
Match match = buildIpv6FLabelMatch(0x0f9e8dL, true, new byte[]{0, 1, 2, 3});
ByteBuf out = UnpooledByteBufAllocator.DEFAULT.buffer();
matchSerializer.serialize(match, out);
Assert.assertEquals("Wrong type", 1, out.readUnsignedShort());
out.skipBytes(EncodeConstants.SIZE_OF_SHORT_IN_BYTES);
Assert.assertEquals("Wrong class", 0x8000, out.readUnsignedShort());
Assert.assertEquals("Wrong field and mask", 57, out.readUnsignedByte());
out.skipBytes(EncodeConstants.SIZE_OF_BYTE_IN_BYTES);
byte[] label = new byte[4];
out.readBytes(label);
Assert.assertArrayEquals("Wrong ipv6FLabel", new byte[]{0, 0x0f, (byte) 0x9e, (byte) 0x8d}, label);
byte[] mask = new byte[4];
out.readBytes(mask);
Assert.assertArrayEquals("Wrong ipv6FLabel mask", new byte[]{0, 1, 2, 3}, mask);
}
/**
* Test for correct serialization of Ipv4Address match entry with wrong mask
*/
@Test
public void testIpv6FlabelWithMaskBad() {
Match match = buildIpv6FLabelMatch(0x0f9e8dL, true, new byte[]{0x0c, 0x7b, 0x6a});
ByteBuf out = UnpooledByteBufAllocator.DEFAULT.buffer();
try {
matchSerializer.serialize(match, out);
Assert.fail("incorrect length of mask ignored");
} catch (IllegalArgumentException e) {
//expected
}
}
/**
* @param labelValue ipv6 flow label
* @param hasMask
* @param mask ipv6 flow label mask
* @return
*/
private static Match buildIpv6FLabelMatch(long labelValue, boolean hasMask, byte[] mask) {
MatchBuilder builder = new MatchBuilder();
builder.setType(OxmMatchType.class);
List<MatchEntry> entries = new ArrayList<>();
MatchEntryBuilder entriesBuilder = new MatchEntryBuilder();
entriesBuilder.setOxmClass(OpenflowBasicClass.class);
entriesBuilder.setOxmMatchField(Ipv6Flabel.class);
entriesBuilder.setHasMask(hasMask);
Ipv6FlabelCaseBuilder ipv6FlabelCaseBuilder = new Ipv6FlabelCaseBuilder();
Ipv6FlabelBuilder ipv6FlabelBuilder = new Ipv6FlabelBuilder();
ipv6FlabelBuilder.setIpv6Flabel(new Ipv6FlowLabel(labelValue));
ipv6FlabelBuilder.setMask(mask);
ipv6FlabelCaseBuilder.setIpv6Flabel(ipv6FlabelBuilder.build());
entriesBuilder.setMatchEntryValue(ipv6FlabelCaseBuilder.build());
entries.add(entriesBuilder.build());
builder.setMatchEntry(entries);
Match match = builder.build();
return match;
}
/**
* Test Standard match type
*/
@Test
public void testStandardMatchType() {
MatchBuilder builder = new MatchBuilder();
builder.setType(StandardMatchType.class);
Match match = builder.build();
ByteBuf out = UnpooledByteBufAllocator.DEFAULT.buffer();
matchSerializer.serialize(match, out);
Assert.assertEquals("Wrong match type", 0, out.readUnsignedShort());
Assert.assertEquals("Wrong match length", 4, out.readUnsignedShort());
Assert.assertEquals("Wrong padding", 0, out.readUnsignedInt());
Assert.assertEquals("Unexpected data", 0, out.readableBytes());
}
/**
* Test serialize experimenter match entry - with no experimenter
* match entry serializer registered
*/
@Test(expected=IllegalStateException.class)
public void testSerializeExperimenterMatchEntry() {
List<MatchEntry> entries = new ArrayList<>();
MatchEntryBuilder builder = new MatchEntryBuilder();
builder.setOxmClass(ExperimenterClass.class);
builder.setOxmMatchField(OxmMatchFieldClass.class);
builder.setHasMask(true);
ExperimenterIdCaseBuilder caseBuilder = new ExperimenterIdCaseBuilder();
ExperimenterBuilder expBuilder = new ExperimenterBuilder();
expBuilder.setExperimenter(new ExperimenterId(42L));
caseBuilder.setExperimenter(expBuilder.build());
builder.setMatchEntryValue(caseBuilder.build());
entries.add(builder.build());
ByteBuf out = UnpooledByteBufAllocator.DEFAULT.buffer();
((OF13MatchSerializer) matchSerializer).serializeMatchEntries(entries, out);
}
private class OxmMatchFieldClass extends MatchField {
// only for testing purposes
}
}