Unit test failure in testOnErrorMessage due to timing issues

The link for the unit test failure:
https://jenkins.opendaylight.org/releng/view/autorelease/job/autorelease-release-lithium/38/org.opendaylight.openflowplugin$openflowplugin/testReport/junit/org.opendaylight.openflowplugin.openflow.md.core/ConnectionConductorImplTest/testOnErrorMessage/ says:

Error Message

expected:<1> but was:<0>
Stacktrace

java.lang.AssertionError: expected:<1> but was:<0>
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.failNotEquals(Assert.java:743)
at org.junit.Assert.assertEquals(Assert.java:118)
at org.junit.Assert.assertEquals(Assert.java:555)
at org.junit.Assert.assertEquals(Assert.java:542)
at org.opendaylight.openflowplugin.openflow.md.core.ConnectionConductorImplTest.testOnErrorMessage(ConnectionConductorImplTest.java:610)

/**

• Test method for

• {@link org.opendaylight.openflowplugin.openflow.md.core.ConnectionConductorImpl#onExperimenterMessage(ExperimenterMessage)}

• .

*

• @throws InterruptedException

*/

@Test

public void testOnErrorMessage() throws InterruptedException {

simulateV13PostHandshakeState(connectionConductor);

ErrorMessageBuilder builder1 = new ErrorMessageBuilder();

builder1.setVersion((short) 4);

builder1.setCode(100);

connectionConductor.onErrorMessage(builder1.build());

synchronized (popListener)

{ popListener.wait(maxProcessingTimeout); }

>>>> Assert.assertEquals(1, errorMessageCounter);