Dry run support

[kris-luminar]

Is your feature request related to a problem? Please describe.
I want to run a report of our current code coverage without actually executing all the tests.

Describe the solution you'd like

As of Mocha 9, it has as a --dry-run option. See https://mochajs.org/#-dry-run

Can we add support for this Mocha option?

Describe alternatives you've considered

I wrote a shell script to create an html file but it doesn't handle multi-line skipped tests

describe.skip('this is correctly left out of the report', ...
  it('this is incorrectly included in the report

It also fails to address JavaScript variable interpolation in the messages provided to it(), describe(), context()`.

This is an excerpt from the simple the bash script I wrote as a workaround.

listSpecsForProject() {
  grep -hr "describe(\| context(\| it(" $1 \
    | grep -v "^ *//" \
    | sed -E "s/( *)(describe)\('(.*)',.*/<h3>\3<\/h3>/g" \
    | sed -E "s/( *)(describe)\(\"(.*)\",.*/<h3>\3<\/h3>/g" \
    | sed -E "s/( *)(describe)\(\`(.*)\`,.*/<h3>\3<\/h3>/g" \
    | sed -E "s/( *)(context)\('(.*)',.*/<h4>\3<\/h4>/g" \
    | sed -E "s/( *)(context)\(\"(.*)\",.*/<h4>\3<\/h4>/g" \
    | sed -E "s/( *)(context)\(\`(.*)\`,.*/<h4>\3<\/h4>/g" \
    | sed -E "s/( *)(it)\('(.*)',.*/<li>\3<\/li>/g" \
    | sed -E "s/( *)(it)\(\"(.*)\",.*/<li>\3<\/li>/g" \
    | sed -E "s/( *)(it)\(\`(.*)\`,.*/<li>\3<\/li>/g"
}

Additional context

Any dry run solution needs to address JavaScript variable interpolation in the messages provided to it(), describe(), context()`. I assume we'd get that for free with Mocha's --dry-run option but haven't investigated.