Add metadata title in unit test

[slackerzz]

Description

Trying to backport #11368 i've found that @phoenix128 fixed the same issue in 1413d65

This pull request only add test coverage to metadata title

Fixed Issues (if relevant)

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @slackerzz. 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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[orlangur]

Nice @slackerzz! And big thanks for making this quick investigation.

[magento-engcom-team]

Hi @orlangur, thank you for the review.
ENGCOM-2106 has been created to process this Pull Request

[magento-engcom-team]

Hi @slackerzz. Thank you for your contribution.
The changes from your Pull Request should be available with the upcoming 2.2.6 release.
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.