How can QA test multiple features at once with feature branching in Gitflow workflow?

If developers were to work on different branches for different features I understand that they can give a QA build from the feature branch and once it is tested it can be merged with "develop".

But if the QA team is fairly large and can test multiple features at once, how can they be given a build containing features that are residing in different branches?

But if the QA team is fairly large and can test multiple features at once how can they be given a build containing features that are residing in different branches?

That would be by:

• setting up an integration branch, reset to the latest master,
• asking for the developers to push their feature branch OR
• or fetching the different developer's repositories, and merging the right feature branches in the integration branch
• running tests in said integration branch