Introduction memo of automatic test using Jenkins
Thing you want to do
Leverage Jenkins to introduce automated testing into your Java project. -When pushed to the master branch, the test will be executed automatically. -The coverage rate is displayed as the test result.
environment
macOS Big Sur 11.1 Homebrew 2.7.1-56-gff931c2 Jenkins 2.273 Java 1.8 ngrok 2.3.35
The samples used for this article can be found on Github. https://github.com/koyi2016/JenkinsDemo
Install Jenkins
Open the termiral on your mac and run the command.
brew install jenkins
It will be installed immediately, so start Jenkins.
java -jar /usr/local/opt/jenkins/libexec/jenkins.war
If it starts normally, the following message will be displayed.
Running from: /usr/local/Cellar/jenkins/2.273/libexec/jenkins.war
webroot: $user.home/.jenkins
2020-12-30 04:38:41.989+0000 [id=1] INFO org.eclipse.jetty.util.log.Log#initialized: Logging initialized @1700ms to org.eclipse.jetty.util.log.JavaUtilLog
2020-12-30 04:38:42.407+0000 [id=1] INFO winstone.Logger#logInternal: Beginning extraction from war file
2020-12-30 04:38:47.104+0000 [id=1] WARNING o.e.j.s.handler.ContextHandler#setContextPath: Empty contextPath
2020-12-30 04:38:47.309+0000 [id=1] INFO org.eclipse.jetty.server.Server#doStart: jetty-9.4.35.v20201120; built: 2020-11-20T21:17:03.964Z; git: bdc54f03a5e0a7e280fab27f55c3c75ee8da89fb; jvm 1.8.0_271-b09
2020-12-30 04:38:48.529+0000 [id=1] INFO o.e.j.w.StandardDescriptorProcessor#visitServlet: NO JSP Support for /, did not find org.eclipse.jetty.jsp.JettyJspServlet
2020-12-30 04:38:48.744+0000 [id=1] INFO o.e.j.s.s.DefaultSessionIdManager#doStart: DefaultSessionIdManager workerName=node0
2020-12-30 04:38:48.744+0000 [id=1] INFO o.e.j.s.s.DefaultSessionIdManager#doStart: No SessionScavenger set, using defaults
2020-12-30 04:38:48.756+0000 [id=1] INFO o.e.j.server.session.HouseKeeper#startScavenging: node0 Scavenging every 600000ms
2020-12-30 04:38:50.356+0000 [id=1] INFO hudson.WebAppMain#contextInitialized: Jenkins home directory: /Users/user/.jenkins found at: $user.home/.jenkins
2020-12-30 04:39:01.536+0000 [id=1] INFO o.e.j.s.handler.ContextHandler#doStart: Started w.@4e9658b5{Jenkins v2.273,/,file:///Users/user/.jenkins/war/,AVAILABLE}{/Users/user/.jenkins/war}
2020-12-30 04:39:01.752+0000 [id=1] INFO o.e.j.server.AbstractConnector#doStart: Started ServerConnector@798162bc{HTTP/1.1, (http/1.1)}{0.0.0.0:8080}
2020-12-30 04:39:01.753+0000 [id=1] INFO org.eclipse.jetty.server.Server#doStart: Started @21464ms
2020-12-30 04:39:01.754+0000 [id=23] INFO winstone.Logger#logInternal: Winstone Servlet Engine running: controlPort=disabled
2020-12-30 04:39:05.365+0000 [id=30] INFO jenkins.InitReactorRunner$1#onAttained: Started initialization
2020-12-30 04:39:05.425+0000 [id=34] INFO jenkins.InitReactorRunner$1#onAttained: Listed all plugins
2020-12-30 04:39:10.521+0000 [id=34] INFO jenkins.InitReactorRunner$1#onAttained: Prepared all plugins
2020-12-30 04:39:10.537+0000 [id=31] INFO jenkins.InitReactorRunner$1#onAttained: Started all plugins
2020-12-30 04:39:10.605+0000 [id=30] INFO jenkins.InitReactorRunner$1#onAttained: Augmented all extensions
2020-12-30 04:39:12.522+0000 [id=28] INFO jenkins.InitReactorRunner$1#onAttained: System config loaded
2020-12-30 04:39:12.522+0000 [id=35] INFO jenkins.InitReactorRunner$1#onAttained: System config adapted
2020-12-30 04:39:12.523+0000 [id=28] INFO jenkins.InitReactorRunner$1#onAttained: Loaded all jobs
2020-12-30 04:39:12.532+0000 [id=28] INFO jenkins.InitReactorRunner$1#onAttained: Configuration for all jobs updated
2020-12-30 04:39:12.552+0000 [id=48] INFO hudson.model.AsyncPeriodicWork#lambda$doRun$0: Started Download metadata
2020-12-30 04:39:12.568+0000 [id=48] INFO hudson.util.Retrier#start: Attempt #1 to do the action check updates server
2020-12-30 04:39:13.625+0000 [id=34] INFO jenkins.install.SetupWizard#init:
*************************************************************
*************************************************************
*************************************************************
Jenkins initial setup is required. An admin user has been created and a password generated.
Please use the following password to proceed to installation:
68fc731c3b5f457ab6e7731dc7ce1215
This may also be found at: /Users/user/.jenkins/secrets/initialAdminPassword
*************************************************************
*************************************************************
*************************************************************
2020-12-30 04:39:35.353+0000 [id=34] INFO jenkins.InitReactorRunner$1#onAttained: Completed initialization
2020-12-30 04:39:35.377+0000 [id=22] INFO hudson.WebAppMain$3#run: Jenkins is fully up and running
2020-12-30 04:39:35.936+0000 [id=48] INFO h.m.DownloadService$Downloadable#load: Obtained the updated data file for hudson.tasks.Maven.MavenInstaller
2020-12-30 04:39:35.938+0000 [id=48] INFO hudson.util.Retrier#start: Performed the action check updates server successfully at the attempt #1
2020-12-30 04:39:35.950+0000 [id=48] INFO hudson.model.AsyncPeriodicWork#lambda$doRun$0: Finished Download metadata. 23,396 ms
Jenkins default settings
After the above installation is completed, start the browser and enter the following URL to open Jenkins. http://localhost:8080/
Enter the password that is automatically generated when the installation is successful in the password entry field. 「68fc731c3b5f457ab6e7731dc7ce1215」
Then select "Install suggested plugins".
After the plugin is installed, set up an admin user.
This completes the initial setup.
Settings for automated testing
ngrok installation
ngrok is a tool that allows you to access a server running on localhost from outside the LAN. I added ngrok so that I can communicate Jenkins built locally this time from the webhook on GitHub.
Open the termiral on your mac and run the command.
brew install ngrok
After installation, use the following command to expose the port 8080 used by Jenkins. The valid time seems to be 8 hours.
ngrok http 8080
The URL of "http://b8dd86e8f647.ngrok.io" has been made available from the outside. This URL is used for webhooks on GitHub.
Github settings
From the target repository, click Settings> Webhooks> Add webhooks and set as follows.
If you can communicate well with Jenkins, you can get a good response at "Recent Deliveries".
Jenkins settings
Installation of required plugins
Find and install the following plugins from Jenkins Administration> Plugins Administration> Available.
・ GitHub Plugin (already installed when installing Jenkins) https://plugins.jenkins.io/github/
・ GitHub Integration https://plugins.jenkins.io/github-pullrequest/
・ Jacoco https://plugins.jenkins.io/jacoco/
You should restart Jenkins after installing the plugin. You can restart by entering the following URL in the URL of the browser.
http://localhost:8080/safeRestart
Jenkin system settings
From Manage Jenkins> System Settings, do the following:
-Set the URL of Jenkins.
-Check if the "Override Hook URL" of Jenkins matches the "Payload URL" of the webhook of GitHub set above.
Configure the JDK from Manage Jenkins> Global Tool Configuration. Leave the other settings at their defaults.
Creating a build job
Create a new job.
Check General's GitHub project and enter the URL of the target repository.
Check Git in Source Code Control and enter your credentials and target branch. Your credentials are an account that can access GitHub.
"GitHub hook trigger for GITScm polling" in the build trigger Is checked.
Select the Maven call in your build and enter clean jacoco: prepare-agent test.
Select "Aggregate Junit test results" in the post-build process.
Finally, select "Record JaCoCo coverage report" and save.
You have now created a new job.
Automatic test
-Make changes to the master branch of the target repository and push.
-Detects the push from Jenkins and performs an automatic build. The result of the build is as follows.
You can see the coverage details by clicking on the build history number.
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