Coverage drop in nightly runs

[mhdawson]

• Version: master
• Platform: all
• Subsystem: test

From the latest runs the c coverage has dropped 6.5%. Seems like it may be that the n-api tests are no longer running as one thing I noticed is that the coverage for node-api.cc was 0.

[mhdawson]

Quite likely related to 5be4dfa#diff-b67911656ef5d18c4ae36cb6741b7965

[mhdawson]

And this PR #15450

Looks like n-api addons may not be running in nightly builds either:

From https://ci.nodejs.org/job/node-test-commit-linux/nodes=ubuntu1404-32/13016/console

The before/after is as follows and addons seems to be mentioned but I'm not sure if that includes the n-api versions.

After
/usr/bin/python tools/test.py -p tap --logfile test.tap --mode=release --flaky-tests=dontcare \
		 addons doctool message parallel pseudo-tty sequential

Before
/usr/bin/python tools/test.py -j 2 -p tap --logfile test.tap \
		--mode=release --flaky-tests=dontcare \
		 async-hooks default known_issues

[BridgeAR]

Ping @bcoe

[mhdawson]

@BridgeAR thanks for looping in @bcoe I suspect he'll be able to quickly see if there is an issue in the change of if there is some update I need to make in the coverage job.