Add integration tests

[hipstersmoothie]

They are needed quite badly

[tylerkrupicka]

Note for hacktoberfest participants, there's a large amount of integration testing that would be helpful with this project. Even adding automated tests to one of the packages or plugins would be a huge help!

[mattgabor]

@tylerkrupicka can you add some details around which plugins/packages would be most useful to test and which testing stack is preferred?

[Geczy]

I recommend https://www.cypress.io/ and https://percy.io/

[rum1887]

@tylerkrupicka is the issue still open?