Lowercase drive letter on localhost path mappings on Windows

[kimadeline]

For #5362

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• Title summarizes what is changing
• Has a news entry file (remember to thank yourself!)
• Appropriate comments and documentation strings in the code
• Has sufficient logging.
• Has telemetry for enhancements.
• Unit tests & system/integration tests are added/updated
• Test plan is updated as appropriate
• package-lock.json has been regenerated by running npm install (if dependencies have changed)
• The wiki is updated with any design decisions/details.

[DonJayamanne]

Please add the additional tests before merging.

[DonJayamanne]

@kimadeline
Sorry, thought I saw something that was incorrect. Its all good.
Just one suggestion, please try avoiding the use of if... conditions to skip tests.
Assume we had 3-4 tests or more, what happens is, we have a large if... block and code gets difficult to read E.g. i scroll down and read the test and fail to realize that its only being tested under a specific scenario.

You can instead use this.skip() inside tests to skip tests.

[kimadeline]

Good point, I'll move the if (windows) condition inside the test and do something like:

test(`Ensure drive letter is lower cased for local path mappings on Windows when host is '${host}'`, async () => {
   if (os.name === 'Windows') {
      this.skip();
   }

   // test code
});

[DonJayamanne]

Remember:

• Don't use arrow function, else you lose scope (this is different)
• Use return (people forget this).

test(`Ensure drive letter is lower cased for local path mappings on Windows when host is '${host}'`, async function (){
   if (os.name === 'Windows') {
      return this.skip();
   }

   // test code
});