How to throw an exception that the say exercise test recognizes?

Programming Clojure
1

The say exercise tests for out-of-range inputs, expecting an IllegalArgumentException. I’ve added code that throws those exceptions (at least, they show up in my REPL). But the Exercism test runner fails my code:

CODE RUN
(is (thrown? IllegalArgumentException (say/number -1)))
TEST ERROR
An unexpected error occurred:
java.lang.Exception: IllegalArgumentException

I don’t see any hints for this exercise, and I could use one (or more) for throwing exceptions that will meet the test.

2 
(throw (Exception. "Some text"))

This might be the hint you are looking for. If this is a practice exercise, then I am not surprised that there is no hint. Searching documentation to answer such questions is a skill that is probably assumed for those practicing the language.

If this is a concept exercise, then it might be expected that this very question is answered in the form of a prior exercise, or the documentation for this one if exceptions are the focused concept, or even only a required concept among others for this concept exercise.

I do not do much in the way of Clojure, but I hope that is helpful.

3

Thank you, kotp. I did figure that out and code it.

If I’m reading the test results correctly, it’s saying that I have thrown the IllegalArgumentException, but it is still giving me a fail. There may be a nuance that I’m missing.

4

It is always best to show your code and the communication you get back. This lets someone know more of the story.

5

The output indicates that an Exception is thrown instead of IllegalArgumentException.

6

Thank you, kotp,

Here’s my code that throw an exception for negative numbers:

(cond 
  (< num 0) (throw (Exception. "IllegalArgumentException"))
  ; . . .
)
7

Thank you, tasx.

That’s what I was missing – I thought I was throwing the specific type of exception, but was only throwing a generic exception.

(throw (IllegalArgumentException. "IllegalArgumentException")
8

This does throw Exception not IllegalArgumentException, just as you wrote it. Re-read the error message?

9

And because you were throwing a generic Exception, this made the tests themselves throw an Exception telling you that this is an illegal argument instead of just passing without errors :)

10

Thank you for the fast and helpful replies, both kotp and tasx!