Fix typo in test method's name and test result

[dmytro-ch]

Note: Already fixed in 2.3-develop (as part of #13300), no forwardport needed.

Description

Fix typo in test method's name and in a test result

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)

[rogyar]

Hello @dmytro-ch. Thank you for your collaboration. To preserve backward compatibility, it's prohibited to remove existing public or protected methods.

Check https://devdocs.magento.com/guides/v2.2/contributor-guide/backward-compatible-development/index.html#php for the details.

You can mark the old method as @deprecated, create a new one and proxy invoking of the new method in the old one.

[dmytro-ch]

@rogyar thank you. I've updated the pull request.

[magento-engcom-team]

Hi @dmytro-ch. Thank you for your contribution.
Changes from your Pull Request will be available with the upcoming 2.2.6 release.

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