Add tests for media-wall component

[shreyanshdwivedi]

I'm submitting a ...

• bug report
• feature request
• testing

Details

• Currently the coverage of media-wall component is very less. We should add tests to increase coverage

Screenshot

Will work on the issue??

Yes

[shreyanshdwivedi]

@simsausaurabh @praveenojha33 I think this is a relevant issue and it should be labelled with testing label just like the issue #414
Your views? Can I proceed?