khoamle khoamle - 4 months ago 32
Ruby Question

bitly raise error exception rspec test

I'm trying to write a simple rspec test for bitly raise error exception. How can I write the expect to match the error message

ALREADY_A_BITLY_LINK - '500'
with the
raise_error(BitlyError)
. This rspec actually pass. But if I were to use the same raise_error for invalid URL. It will also pass. How can I test the specific exception message?

bitly_spec.rb

require 'rails_helper'

describe Bitly do
before do
@bitly = Bitly.new(username, api_key)
end
let(:bitly_url) { 'bitly_url' } #stackoverflow doesn't allow URL shortener

it 'should return exception error if given url is bitly' do
expect { @bitly.shorten(bitly_url) }.to raise_error(BitlyError)
end
end


Debugger

@bitly.shorten(bitly_url)
returns
*** BitlyError Exception: ALREADY_A_BITLY_LINK - '500'


raise_error(BitlyError)
returns
#<RSpec::Matchers::BuiltIn::RaiseError:0x007fa229c56f48 @block=nil, @actual_error=nil, @warn_about_bare_error=false, @expected_error=BitlyError, @expected_message=nil>

Answer

As you can see from the docs - https://www.relishapp.com/rspec/rspec-expectations/docs/built-in-matchers/raise-error-matcher - the raise error matcher can take a second parameter of string or regex to match against the exceptions message

expect { whatever }.to raise_error(BitlyError, "ALREADY_A_BITLY_LINK")