Add snapShot test for dialog component

[FacuRossi]

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[hbowden]

@FacuRossi Thanks for the pr! It looks good from looking at the diff. I'll pull it down and test it and merge in like 15 or 20 minutes I'm just finishing something up. Thanks again for the work.

[Darper]

Hi @FacuRossi. Can you sign the CLA? We'll need it to merge your contribution. Thanks!

[Darper]

Also, children is a required property for Dialog. Please add some example children to make your new test pass then update your snapshot file using npm run updateSnapshot.

[Darper]

The snapshot test is still failing. children are required, so won't work.