cov_1fanynun32 is not defined

[epyx25]

Expected Behavior

test runs with nyc cover

Observed Behavior

running npm test produces the following error:

Rejected promise returned by test

Rejection reason:

"cov_1fanynun32 is not defined"

Removing nyc from the test script solves the problem, all tests runs as expected.

Looks like related to #514

Bonus Points! Code (or Repository) that Reproduces Issue

https://github.com/epyx25/test

Here is the test, and here is hte tested class. I also tried to cut out internet connection from the test, and load a html page from file, but it did not change anything.

Forensic Information

Operating System: the operating system you observed the issue on.
OS: Ubuntu 16.04

Environment Information: information about your project's environment, see instructions below:

1. run the following script:

sh -c 'node --version; npm --version; npm ls' > output.txt

2. share a gist with the contents of output.txt.
   https://gist.github.com/epyx25/1865ab17587cd3c425cd067ee80ad06a#file-gistfile1-txt

[keithkml]

See solution at #514 (comment)

[JaKXz]

I'm going to close this in favour of #514. Thank you for the issue!