kernel.rb:27:in `should': uninitialized constant RSpec::Expectations::PositiveExpectationHandler (NameError)

rails | ruby | testing

This one took a while and required extensive help from a rocket scientist. While running RSpec I got this.

.../test/ruby/1.9.1/bundler/gems/rspec-expectations-68f857b9b668/lib/rspec/expectations/extensions/kernel.rb:27:
  in `should': uninitialized constant RSpec::Expectations::PositiveExpectationHandler (NameError)

The problem was that you need to configure the expectations framework in spec/spec_helper.rb. The expect_with :rspec is the fix.

RSpec.configure do |config|
    config.mock_with :rspec
    config.expect_with :rspec
end

You can read more about rspec configuration here.