Can someone explain what the square brackets mean in the test cases?

expected:< *

[] *

but was:< *

[***
] *

I'm not sure why my square brackets have three stars in them, but the example doesn't. Also very confused as to where these brackets are comine from. Any assistance would be greatly appreciated!

So to answer @warkentien2's question, is it considered appropriate to use stackoverflow or google to help solve katas? IE, I don't copy and paste the solution from somewhere else, but I use the web to find methods, check syntax, check libraries, etc.