Sharing formatted reports over the mail in Jenkins - jenkins

Question

What's Working - We are currently using testng emailable format and allure to generate formatted reports for our current test execution. These are working fine with our local. The /target/report structure can be seen in the image to depict 2 different folders for allure(/site) and testng(/surefire) reports respectively :
Trying to - While we are trying to implement a CI using Jenkins using the same steps as in our local, the tests are executed fine and the respective reports are getting generated as well.
Using TestNG plugin
and specifying the pattern **/target/surefire-reports/testng-results.xml works just fine to display the testNG result graph.
Also using the Email ext plugin I can attach the .html reports to the mail sent to the recipients specifying the attachment field details as :
**/target/surefire-reports/emailable-report.html, **/target/surefire-reports/index.html
What doesn't work - We end up getting emails with HTML reports but these are not formatted, probably because all the CSS linked to these are left behind. Is there a way to overcome this?
Note - Have tried these:
Attaching all the .css files along with .html file in attachments but, one that's brute force and second it still doesn't work.
One way also is to scp the report (/target) directory to another host from Jenkins instance and share the path of the reports on that machine over the email notification and get the formatted reports shared. But then this needs an additional resource and dependency on it, that we would want to avoid.
While posting this, I see an HTML publisher plugin that seems to be doing something similar. Tried installing the same and use it. But I am assuming since we are using Jenkins 2.6 and the plugin note reads
Starting in versions 1.625.3 and 1.641, Jenkins restricted what kind
of content could be displayed when serving static files. This can
impact how HTML files archived using this plugin are displayed. See
Configuring Content Security Policy for more information.
We are not getting the option to Publish HTML Reports in the post build actions.
Any suggestions are more than welcome and please do ask for any more information required over this.
Edit : Adding to the Note 2 above, the Jenkins instances used in our setup are docker slaves, apparently making the reports or targets generated not being persistent.

Answer 1

Here's what you can consider doing.
Option 1
Build an implementation for IExecutionListener wherein you create the logic to basically zip up all the reports that you want and have it sent as an e-mail.
Wire in this listener and that should take care.
PS : Currently implementations of IExecutionListener are invoked "before" the report generation phase. I have changed this as part of this commit. So if you would like to go ahead with this approach then you might want to wait till TestNG goes out with a new release (should happen in a couple of days )
Option 2
Build a wrapper reporter (which implements IReporter) and wire in ONLY this reporter.
Within this reporter, you explicitly instantiate all the reporters that you would like to be called in for your reporting phase. See below for a possible sample.
public class ChainedReporter implements IReporter {
private List<IReporter> reporters = new ArrayList<>;
public ChainedReporter() {
reporters.add(new FooReporter() );//Here FooReporter is a custom reporter. Replace it with yours.
reporters.add(new BarReporter() );//Here BarReporter is a custom reporter. Replace it with yours.
}
public void generateReport(List<XmlSuite> xmlSuites, List<ISuite> suites, String outputDirectory) {
for (IReporter reporter : reporters) {
reporter.generateReport(xmlSuites, suites, outputDirectory);
}
//By now we have ensured that all the reporting logic has been triggered and we have reports generated.
zipReports(); // This method would take care of creating zipped files of all the reports.
emailReports(); // This emthod would take care of emailing the actual reports.
}
}