[Search] Unit test for SynonymAnalyzer model

[furseyev]

Description

A phpunit test for the \Magento\Search\Model\SynonymAnalyzer class added

[magento-engcom-team]

Hi @furseyev. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

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[furseyev]

@magento-engcom-team give me test instance

[magento-engcom-team]

Hi @furseyev. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @furseyev, here is your new Magento instance.
Admin access: https://pr-17801.engcom.dev.magento.com/admin
Login: admin Password: 123123q

[magento-engcom-team]

Hi @sidolov, thank you for the review.
ENGCOM-2876 has been created to process this Pull Request

[magento-engcom-team]

Hi @furseyev. Thank you for your contribution.
We will aim to release these changes as part of 2.2.7.
Please check the release notes for final confirmation.

Please, consider to port this solution to 2.3 release line.
You may use Porting tool to port commits automatically.