# Test Harness: create agent with multiple executors? **URL:** \ **Category:** Ask a question\ **Tags:** question, jenkins-test-harness\ **Created:** [April 8, 2025, 11:07am UTC](https://community.jenkins.io/t/test-harness-create-agent-with-multiple-executors/29545 "2025-04-08T11:07:40Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Artalus](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/artalus/32/11413_2.png) [@Artalus](https://community.jenkins.io/u/Artalus)\ **Post date:** [April 8, 2025, 11:07am UTC](https://community.jenkins.io/t/test-harness-create-agent-with-multiple-executors/29545/1 "2025-04-08T11:07:40Z")
I have this test that uses [`jenkins-test-harness`](https://github.com/jenkinsci/jenkins-test-harness/): ```java class JenkinsUtilsTest extends spock.lang.Specification { @spock.lang.Shared @org.junit.ClassRule JenkinsRule harness = new JenkinsRule() void setupSpec() { hudson.model.Slave node = harness.createSlave('an-agent', null, null) node.numExecutors = 2 harness.waitOnline(node) } void 'check parallel works'() { given: def job = harness.createProject(WorkflowJob) job.definition = new org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition(''' parallel([ sleeper: { node('an-agent') { echo '--- going to sleep' sleep time: 15, unit: 'SECONDS' echo '--- done sleeping' } }, waiter: { echo '--- pause in favor of sleeper' sleep time: 5, unit: 'SECONDS' node('an-agent') { echo '--- done waiting' } } ]) ''', true) when: WorkflowRun run = harness.buildAndAssertSuccess(job) then: harness.assertLogContains('show me the logs', run) } ``` When I run it, the logs say: ``` [Pipeline] Start of Pipeline [Pipeline] parallel [Pipeline] { (Branch: sleeper) [Pipeline] { (Branch: waiter) [Pipeline] node [Pipeline] echo --- pause in favor of sleeper [Pipeline] sleep Sleeping for 5 sec Running on an-agent in /tmp/j h3074825386784972163/agent-work-dirs/an-agent/workspace/test0 [Pipeline] { [Pipeline] echo --- going to sleep [Pipeline] sleep Sleeping for 15 sec [Pipeline] node [Pipeline] echo --- done sleeping [Pipeline] } Running on an-agent in /tmp/j h3074825386784972163/agent-work-dirs/an-agent/workspace/test0 [Pipeline] // node [Pipeline] { [Pipeline] } [Pipeline] echo --- done waiting [Pipeline] } [Pipeline] // node [Pipeline] } [Pipeline] // parallel [Pipeline] End of Pipeline ``` , so clearly there is only one Executor on the agent. I can confirm this asserting `node.computer.executors.size() == 2` in the setup - it is actually `1`, just like the [`hudson.model.Slave#getNumExecutors()` docs](https://javadoc.jenkins-ci.org/hudson/model/Slave.html#getNumExecutors()) state: > This may be different from `getExecutors().size()` because it takes time to adjust the number of executors. But how do I actually ensure that the number of executors has adjusted? Or better yet, force the adjustion - as I tried `Thread.sleep(60000)` and it did nothing. ---
**Author:** ![mawinter69](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/mawinter69/32/1625_2.png) [@mawinter69](https://community.jenkins.io/u/mawinter69)\ **Post date:** [April 22, 2025, 10:46pm UTC](https://community.jenkins.io/t/test-harness-create-agent-with-multiple-executors/29545/2 "2025-04-22T22:46:34Z")
you will need to do ```auto node.toComputer().setNumExecutors(2) ``` ---
**Author:** ![Artalus](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/artalus/32/11413_2.png) [@Artalus](https://community.jenkins.io/u/Artalus)\ **Post date:** [April 23, 2025, 10:07am UTC](https://community.jenkins.io/t/test-harness-create-agent-with-multiple-executors/29545/3 "2025-04-23T10:07:35Z")
Thank you for chiming in @mawinter69 . There does not seem to be `setNumExecutors` in the [`hudson.slaves.SlaveComputer` object](https://javadoc.jenkins-ci.org/hudson/slaves/SlaveComputer.html) returned by `.toComputer()` or `.getComputer()` – only in [`hudson.model.Slave`](https://javadoc.jenkins-ci.org/hudson/model/Slave.html#setNumExecutors(int)) itself… ```auto JenkinsUtilsTest > classMethod FAILED groovy.lang.MissingMethodException: No signature of method: hudson.slaves.SlaveComputer.setNumExecutors() is applicable for argument types: (java.lang.Integer) values: [2] Possible solutions: getNumExecutors(), getAllExecutors(), getExecutors() ``` ---
**Author:** ![mawinter69](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/mawinter69/32/1625_2.png) [@mawinter69](https://community.jenkins.io/u/mawinter69)\ **Post date:** [April 23, 2025, 10:30am UTC](https://community.jenkins.io/t/test-harness-create-agent-with-multiple-executors/29545/4 "2025-04-23T10:30:19Z")
ah sorry `setNumExecutors` is private in `Computer` class ---
**Author:** ![Artalus](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/artalus/32/11413_2.png) [@Artalus](https://community.jenkins.io/u/Artalus)\ **Post date:** [April 29, 2025, 12:02pm UTC](https://community.jenkins.io/t/test-harness-create-agent-with-multiple-executors/29545/5 "2025-04-29T12:02:37Z")
@mawinter69 do you maybe have some other ideas by any chance, or maybe know someone else we can try pinging here? 🙏 ---
**Author:** ![mawinter69](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/mawinter69/32/1625_2.png) [@mawinter69](https://community.jenkins.io/u/mawinter69)\ **Post date:** [April 29, 2025, 12:54pm UTC](https://community.jenkins.io/t/test-harness-create-agent-with-multiple-executors/29545/6 "2025-04-29T12:54:08Z")
You can use the following trick ```auto node.numExecutors = 2 harness.jenkins.getNodesObject().replaceNode(node, node); ``` ---
**Author:** ![Artalus](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/artalus/32/11413_2.png) [@Artalus](https://community.jenkins.io/u/Artalus)\ **Post date:** [May 1, 2025, 1:24pm UTC](https://community.jenkins.io/t/test-harness-create-agent-with-multiple-executors/29545/7 "2025-05-01T13:24:35Z")
Thank you very much Markus, that did it! Was afraid it would incur some additional waits for reinitialization to complete, but seems to go almost instantly. 🎉