Hello DEV.to community!

I am a bit nervous to ask this question here. But I really need your help on this.
I am new to ruby and test driven development. I just wanted to know how you guys do Integration testing in your rails project. Integration test are too slow and sometime fails. I want to know how you guys do Integration testing in your projects and make them faster. Also how you manage to do testing for different screen sizes like mobile and tablets.

I am a beginner rubyist. If you can suggest any good platform/community to ask this ques please recommend that too. 😁