Script task does not run tests on Windows agents

[mikeharder]

This script task does not run tests on Windows agents:

pipelines-javascript/azure-pipelines.yml

Lines 11 to 13 in 2e35b35

	- script: |
	npm install
	npm test

To repro, change the vmImage to vs2017-win2016 and trigger a build.

I believe this happens because:

• npm is npm.cmd on Windows
• The script task combines npm install and npm test into a single .cmd file and executes it
• When an outer batch file calls an inner batch file (without using call syntax), when the inner batch file returns, the outer batch file exits early
• So, the generated .cmd file exits after the first npm command

You can repo this on any Windows machine by executing a batch file containing:

npm install
npm test

To execute both commands, the call syntax must be used:

call npm install
call npm test

I believe the best fix is to use the Npm task instead of the script task (#3).