chore: fix and skip failed unit tests

[lekhmanrus]

PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• You have signed the CLA.
• All existing tests are passing: https://github.com/NativeScript/nativescript-schematics/blob/master/CONTRIBUTING.md#running-tests.
• Tests for the changes are included.

What is the current behavior?

Unit tests are failing

What is the new behavior?

Some failed tests are fixed, some just skipped.