Newman htmlextra reporter complains about newman is missing but it's installed - docker

Question

I'm trying to install and run Postman's Newman tests collection with HTML reporter (on a jenkins podTemplate container with docker image from Postman's account) but it keeps failing because no suitable Newman version is found:
"npm WARN newman-reporter-htmlextra#1.19.6 requires a peer of newman#>=4 but none is installed. You must install peer dependencies yourself"
Newman image docker is "postman/newman:5.2-alpine".
And the Run command is
sh "newman run tests/collection.json -r htmlextra --reporter-htmlextra-export var/reports/newman/html/index.html";
I've also tried to install with (the "sh" prefix is because it's in groovy script..in Jenkins) :
sh "npm install -g newman#4.6.1"
sh "npm install -g newman-reporter-htmlextra"
and then executing the same run command as above.
sh "newman run tests/collection.json -r htmlextra --reporter-htmlextra-export var/reports/newman/html/index.html";
But the results are the same.
What's weird is that right after I get the error mentioned above - the jenkinsfile executes the "newman run" command and successfully creates the tests report file:
Using htmlextra version 1.19.6
Created the htmlextra report in this location: var/reports/newman/html/index.html
But then exits the script/job with FAILURE.
What am I missing?
Any advice?
Thank you!

Answer 1

Thats a npm bug, https://github.com/npm/npm/issues/12905
for newman-reporter-htmlextra , newman is a peer dependency.
In npm peer dependency is not detected for global packages if the dependency and the package are not installed together
In this case you can fix it by installing it together using
npm install -g newman newman-reporter-htmlextra
Try :
podTemplate(label: "newmanPodHtmlExtra", containers: [
containerTemplate(name: "newman", image: "dannydainton/htmlextra", command: "cat", ttyEnabled: true),
]) {
node("newmanPodHtmlExtra") {
def testsFolder = "./tests";
container("newman") {
stage("Checkout") {
checkout scm;
}
try{
stage("Install & run Newman") {
sh "npm install -g newman newman-reporter-htmlextra";
sh "newman run ${testsFolder}/collection.json -r htmlextra --reporter-htmlextra-export var/reports/newman/html/index.html";
}
}catch(e){}finally{
stage("Show tests results") {
publishHTML([allowMissing: false, alwaysLinkToLastBuild: false, keepAll: false, reportDir: 'var/reports/newman/html', reportFiles: 'index.html', reportName: 'API Tests', reportTitles: ''
])
}
}
}
}
}