[Backport] testGetIgnoresFirstSlash method in ObjectManagerTest has lost its purpose (dummy test)

[mageprince]

Original Pull Request

#11666

Once upon a time, long long time ago, in the beginning of times, there was a test method inside a unit test class with a purpose. Nowadays, it has become a dummy test, because of some refactoring.

\Magento\Framework\ObjectManager\Test\Unit\ObjectManagerTest::testGetIgnoresFirstSlash is that method, intended to check if same object was returned when calling ObjectManager::get('\Classname') and ObjectManager::get('Classname'):

Now, it really doesn't check anything, because the two calls are the same:

Description

Proposed change will make this test useful again, as when it was born:

Fixed Issues (if relevant)

None.

Manual testing scenarios

1. Run unit tests over this class.
2. They should pass with the changes.

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 @mageprince. 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:

• @magento-engcom-team give me test instance - deploy test instance based on PR changes
• @magento-engcom-team give me {$VERSION} instance - deploy vanilla Magento instance

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[magento-engcom-team]

Hi @mageprince. Thank you for your contribution.
We will aim to release these changes as part of 2.2.6.
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.