Karaf Integration Tests failed

Failed tests:

ActiveMQBrokerNdCamelFeatureTest.test:51->AbstractFeatureTest.assertBrokerStarted:123->AbstractFeatureTest.withinReason:189 expected:<[brokerName=amq-broker]>but was:<[]>

I downloaded Apache activeMQ-5.15.9 from github. It failed after  I ran the command "mvn clean" and "mvn test" in my linux environment. It shown that the Karaf Integration Tests  was failure,  I entered the  activemq-karaf-itest project, run the "mvn test" command, it failed again. The attachment shows the error message.