test(config): Check for the correct symbolic link before test:client

[johnjbarton]

I've hit this a couple of times but many months apart, enough time to forget. The error is quite
puzzling without some hints.

Fixes #3391

[karmarunnerbot]

✅ Build karma 48 completed (commit 931579430c by @johnjbarton)

[AppVeyorBot]

✅ Build karma 2446 completed (commit a485221464 by @johnjbarton)

[karmarunnerbot]

✅ Build karma 47 completed (commit 931579430c by @johnjbarton)

[kyliau]

The lock file is needed to pin the dependencies. Was it removed by accident?

[johnjbarton]

Thanks! Yes, I meant to revert the change rather than delete it.

PTAL

[karmarunnerbot]

✅ Build karma 49 completed (commit 140bbd3cea by @johnjbarton)

[AppVeyorBot]

✅ Build karma 2447 completed (commit 140bbd3cea by @johnjbarton)

[karmarunnerbot]

✅ Build karma 48 completed (commit 140bbd3cea by @johnjbarton)

[karmarunnerbot]

🎉 This PR is included in version 5.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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