Rspec on lib + initializer

Question

I'm trying to test a lib I've created. It auto load with an initializer.

Here is what I have

# config/initializer/my_lib.rb

MyLib.configure do |config|

  config.salt   = Rails.application.secrets.encrypted_salt

  config.secret = Rails.application.secrets.encrypted_secret

end



# lib/my_lib.rb

class MyLib



  class << self

    attr_accessor :configuration



    def config

      @configuration ||= Configuration.new

    end



    def configure

      yield(config)

      raise 'Salt not specified' unless config.salt

      raise 'Secret not specified' unless config.secret

    end

  end



  class Configuration

    attr_accessor :salt, :secret

  end

end

What I would like is to test that without

salt

and

secret

,

MyLib.configure

will raise an

RuntimeError

.

I've tried the following test but I'm stuck with the block I think

allow(described_class).to receive(:configure) do |&config|

  config.salt = nil

  config.secret = nil

end

In the previous example both

|config|

and

|&config|

give me a

nil

value for

config

.

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Answer 1

Use expect error:

expect do
  MyLib.configure do |config|
    config.salt   = nil
    config.secret = nil
  end
end.to raise_error RuntimeError

But I would recommend that you create your own exception class such as MyLib::ConfigurationError as RuntimeError could have other causes and the test could actually pass if there is a bug in the code.

Rspec on lib + initializer

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