[tests] Jest unit tests fail in node 7.7

[jasonLaster]

The jest unit tests fail when run in node 7.7 with the error that the global L10N is not available.

Reproduce

• install node 7.7
• git clone https://github.com/devtools-html/debugger.html.git
• yarn
• yarn test

I like using nvm so that i can install a version nvm install 7.7 and then test

Issue

We setup global.L10N here. It's possible this has to do with how Jest uses VM contexts.

[irfanhudda]

I was able to run the test after commenting https://github.com/devtools-html/debugger.html/blob/master/src/utils/tests/scopes.js#L200 and https://github.com/devtools-html/debugger.html/blob/master/src/utils/tests/scopes.js#L204 lines

[MylesBorins]

so I'm seeing this fail in node v6.10.2 and v7.6.0... going to assume that @irfanhudda figured this out and the bug was not in Node itself. LMK if I am wrong

[jasonLaster]

hmm, i didn't see it in 7.0

[jasonLaster]

This could be the bug: nodejs/node#11266

[fhinkel]

We changed the behavior in nodejs/node#11266. Now, more properties are (correctly) deleted. Which test is failing? Is there maybe an incorrect assumption that L10N is present when it really should have been deleted?

Background: Jest is using the vm-module, and we change the behavior of the delete operator in the vm-module. Sorry that that's interfering with your tests 😿