Frist, I created a new project, TestA, using BlueOcean Plugin and its editor to create a task:

```
pipeline {
agent {
docker

{ image 'node:alpine' args '-p 3000:3000' }

}
stages {
stage('build') {
parallel {
stage('build') {
steps

{ sh 'npm install' }

}
stage('test') {
steps

{ sh 'npm test' }

}
stage('deliver') {
steps

{ sh 'npm start' }

}
}
}
}
}
```
then, the construction always failed with an error `+ sh 'npm test' sh: 0: Can't open npm`. I tried many times but could not pass any stage of the construction. I googled but no clue, so I tried to create another project NoBlueOcean, with jenkins only, without BlueOcean, with the exactly same source code and config. This time, the construction past in the new project and to my surprise, the previous TestA project past two stages `build` and `test` but failed at the stage `deliver`, the construction logs:

```
+ npm start

> testa@1.0.0 start /var/jenkins_home/workspace/TestA_develop-2FVYGZ7AQEYOGE4PB6TKQSYM3CL5SQG2ZAD2NEG3VSPTBLSGKW3Q
> http-server -p 3000 ./html

sh: http-server: not found
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! testa@1.0.0 start: `http-server -p 3000 ./html`
npm ERR! spawn ENOENT
npm ERR!

```

I attached two construction logs, 1.txt from jenkins only project, 2.txt from BlueOcean. and upload the test project to github: https://github.com/baivoom/jenkins_testa_0519