How to test for exceptions in shoulda along with TestUnit?

Question

I have an application based on padrinorb and I am using the shoulda testing library for the same. There is a method that I need to test throws exception. I tried finding the documentation for the same, but couldn't find anything.

Here's the sample code that I want to test

def some_method(param)
    raise APIException.new('Exception) if param == 2
end

How should I test that the some_method throws an exception when passed the parameter 2.

An aside: To pass your tests, and make the question easier to answer you probably want `param == 2`? — Neil Slater, Sep 19 '13 at 09:32
You're right. I made a mistake there, thanks for pointing it out :-) — Ankit Dhingra, Sep 19 '13 at 09:45

score 3 · Accepted Answer · edited May 23 '17 at 12:05

3

expect{ some_method(params) }.to raise_error(APIException)

if you use TestUnit this should work (source)

assert_raises(APIException) { some_method(params) }

To test the exception message as well use the following:

exception = assert_raises(Exception) { whatever.merge }
assert_equal( "message", exception.message )

edited May 23 '17 at 12:05

Community

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answered Sep 19 '13 at 10:03

gotva

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Is this a valid shoulda matcher? I was trying to use it and got a method not found "Undefined method expect" – Ankit Dhingra Oct 10 '13 at 10:55
no it is RSpec https://www.relishapp.com/rspec/rspec-expectations/v/2-6/docs/built-in-matchers/raise-error-matcher – gotva Oct 10 '13 at 10:58
I am actually not using rspec, using shoula over TestUnit, but thanks for you help :-) – Ankit Dhingra Oct 11 '13 at 05:02
updates answer to test for exception message as well. – Ankit Dhingra Oct 15 '13 at 06:56

How to test for exceptions in shoulda along with TestUnit?

1 Answers1