rspec: raise_error usage to match error message

Question

I raised an error using raise(ConfigurationError.new(msg))

I tried to test this with rspec:

expect {
  Base.configuration.username
}.to raise_error(ConfigurationError, message) 

But this doesn't work. How can I test this? The goal is to match message.

Answer 1

You can match error message with regex:

it { expect{ Foo.bar }.to raise_error(NoMethodError, /private/) }

This will check if NoMethodError raised with private method message not undefined method.

Will be useful because NoMethodError.new didn't pass tests even with same error message.