JenkinsTest is intermittent

[garethjevans]

When JenkinsTest runs on ci.jenkins.io it intermittently fails with:

10:32:15  [ERROR] org.waveywaves.jenkins.plugins.tekton.client.build.create.JenkinsTest.testFreestyleJobWithExpandedYamlInput  Time elapsed: 1.599 s  <<< FAILURE!
10:32:15  java.lang.AssertionError: 
10:32:15  
10:32:15  Expected: a string containing "Whoop! This is the pod log"
10:32:15       but: was "Legacy code started this job.  No cause information is available
10:32:15  Running as SYSTEM
10:32:15  [EnvInject] - Loading node environment variables.
10:32:15  Building in workspace /home/jenkins/workspace/gins_tekton-client-plugin_PR-147/target/tmp/jenkinsTests.tmp/jenkins5080825060315866721test/workspace/p
10:32:15  Deleting existing workspace /home/jenkins/workspace/gins_tekton-client-plugin_PR-147/target/tmp/jenkinsTests.tmp/jenkins5080825060315866721test/workspace/p
10:32:15  Staging file:/home/jenkins/workspace/gins_tekton-client-plugin_PR-147/target/test-classes/org/waveywaves/jenkins/plugins/tekton/client/build/create/tekton-test-project.zip
10:32:15  [Checks API] No suitable checks publisher found.
10:32:15  [Tekton] Pod test/hello-world-pod
10:32:15  [Tekton] Pod test/hello-world-pod - Running...
10:32:15  [Tekton] Container hello-world-container
10:32:15  [Tekton] Container hello-world-container - Completed
10:32:15  W[Tekton] Pod test/hello-world-pod Status: Succeeded
10:32:15  [Tekton] Completed PipelineTask pipelineTaskName
10:32:15  hoop! This is the pod logFinished: SUCCESS
10:32:15  "
10:32:15  	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
10:32:15  	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:6)
10:32:15  	at org.waveywaves.jenkins.plugins.tekton.client.build.create.JenkinsTest.testFreestyleJobWithExpandedYamlInput(JenkinsTest.java:427)
10:32:15  	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
10:32:15  	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
10:32:15  	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
10:32:15  	at java.lang.reflect.Method.invoke(Method.java:498)
10:32:15  	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
10:32:15  	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
10:32:15  	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
10:32:15  	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
10:32:15  	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
10:32:15  	at org.jvnet.hudson.test.JenkinsRule$1.evaluate(JenkinsRule.java:548)
10:32:15  	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:299)
10:32:15  	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:293)
10:32:15  	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
10:32:15  	at java.lang.Thread.run(Thread.java:748)