Rather than passing fake values, just specify that they should be optional:
Code:
Public Sub MySubroutine(Optional ByRef arrMyArray() As Integer, Optional ByRef lngMyLong As Long)
If you want to, you can even set a value that will be used if nothing is passed:
Code:
Public Sub MySubroutine(Optional ByRef arrMyArray() As Integer, Optional ByRef lngMyLong As Long = -1)