With Node 4 unittests fail:

1. Suite .beforeAll() wraps the passed in function in a Hook adds it to _beforeAll:
2. Suite .afterAll() wraps the passed in function in a Hook adds it to _afterAll:
3. Suite .beforeEach() wraps the passed in function in a Hook adds it to _beforeEach:
4. Suite .afterEach() wraps the passed in function in a Hook adds it to _afterEach:

All have a similar Error:
AssertionError: expected '"before all" hook: fn' to be '"before all" hook'

Reason:
In node 6.5.0 anomynous functions have a name when assigned to a variable:

var myFunc = function(){};
console.log(myFunc.name); // ->  'myFunc'

Prior to node 6.5.0 the function name would be empty