No test coverage report generated

[andrewmarklloyd]

Steps to reproduce

• run npm run test:coverage
• Only tested on macOS Sierra

Expected

• Coverage report is printed to terminal as shown below and coverage directory is populated with appropriate metrics

=============================== Coverage summary ===============================
Statements   : 68.03% ( 349/513 )
Branches     : 51.52% ( 102/198 )
Functions    : 52.21% ( 59/113 )
Lines        : 68.8% ( 333/484 )
================================================================================

Observed

• Terminal prints "No coverage information was collected, exit without writing coverage information"

Possible Fix

• Without too much testing, updating from istanbul@0.4.5 to istanbul@1.0.0-alpha.2 generates the coverage report. Not sure if there are other ways to fix this with a different configuration.

[TheHollidayInn]

I'm fine with updating the library to fix!