Add XUnit test for HandleDoubleAndSingleQuote in CompletionHelpers class

[ArmaanMcleod]

PR Summary

So to make sure the HandleDoubleAndSingleQuote method in CompletionHelpers class is covered from regression, I have added tests to ensure code is covered by regressions.

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[iSazonov]

I suggest to add only TestHandleDoubleAndSingleQuote tests in the PR. I have many questions for rest.

[ArmaanMcleod]

I suggest to add only TestHandleDoubleAndSingleQuote tests in the PR. I have many questions for rest.

All good @iSazonov. I have only included test for HandleDoubleAndSingleQuote. I think out of all methods this one is important to have tests because the logic itself is quite complicated and probably very easy to introduce regression 😄.

[iSazonov]

I suggest to move tests for QuoteCompletionText and GetMatchingResults to other PRs. If we add QuoteCompletionText the tests should be in that PR.

[iSazonov]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).

[iSazonov]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[ArmaanMcleod]

@iSazonov Looks like unrelated packaging failures for Windows CI. Might need a rerun. Not sure though if this can auto merge with PSResourceGet and CodeFactor issues.

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