test(developer): add unit tests for isValidUtf8

[ermshiperete]

Follow-up-of: #14369
Test-bot: skip

[keymanapp-test-bot]

User Test Results

Test specification and instructions

User tests are not required

[mcdurdin]

LGTM. I wonder if we can run this compiler update against the keyboards repo just as another sniff test?

You can do this by building kmcmplib, kmc (and its child modules), and then exporting KMC=node <path-to-kmc's-package.json>, e.g. export KMC="node ~/keyman/developer/src/kmc" or similar.

[ermshiperete]

LGTM. I wonder if we can run this compiler update against the keyboards repo just as another sniff test?

You can do this by building kmcmplib, kmc (and its child modules), and then exporting KMC=node <path-to-kmc's-package.json>, e.g. export KMC="node ~/keyman/developer/src/kmc" or similar.

That did work.

(using tilde didn't work, so the export has to be export KMC="node $HOME/keyman/developer/src/kmc")

[keyman-server]

Changes in this pull request will be available for download in Keyman version 19.0.93-alpha