Integration Tests: DOM Assertion class

[lbajsarowicz]

Description (*)

We have plenty of integration tests that make assertions on HTML code:

With assertContains or preg_match. This is not the right approach for making assertions on HTML and the correct approach should be possible. The right approach is based on DOM tree.

Example:
https://github.com/magento/magento2/pull/27606/files#diff-dcb208981e520970637c75ff2d89eafcR169-R173

Expected behavior (*)

We need the DOM assertion class to be introduced to Integration Tests Framework

Benefits

Additional information

[m2-assistant]

Hi @lbajsarowicz. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

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• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

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@lbajsarowicz do you confirm that you were able to reproduce the issue on vanilla Magento instance following steps to reproduce?

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[magento-engcom-team]

✅ Confirmed by @sdzhepa
Thank you for verifying the issue. Based on the provided information internal tickets MC-33094 were created

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