Thursday, January 12, 2012

Specs2: IndexOutOfBoundsException: 30

I was consistently seeing a java.lang.IndexOutOfBoundsException: 30 exception today while working on some code. I had written a spec with a single use case, which was marked as pending because I couldn't test my trait until I flushed out another piece of code upon which it depended.

I'd seen the error in the past, but couldn't remember how (of it) it went away. Since I was working on a pretty much skeleton spec, I figured now would be a good time to get to the bottom of it.

Well, it was pretty simple! In connecting my use case text description to the actual test, I was using a "^" instead of an "!", which also explains the other oddity I was seeing (that I had thought related to pending tests) "No source file found at src/test/scala/...", since the "^" was expecting a String as the result of my test method being run, not a Specs result. Go DSLs!

def is =
"My trait should" ^
"do what I want" ^ SpecsStub().assert() // WRONG, ^ should be !

case class SpecsStub() {
  def assert() = {

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