Experimental version of RSpec/Given that handles should-less assertions (i.e. plain Ruby conditions).

output

  1) Natural Assertions 
     Failure/Error: Then { foo + bar == 2 }
       Then expression failed at /Users/jim/working/git/rspec-given/examples/failing/sample_spec.rb:6
       expected: 3
       to equal: 2
         false   <- foo + bar == 2
         3       <- foo + bar
         1       <- foo
         2       <- bar
     # ./lib/rspec/given/extensions.rb:64:in `_rg_evaluate'
     # ./lib/rspec/given/extensions.rb:56:in `_rg_then'
     # ./examples/failing/sample_spec.rb:6:in `block in Then'

sample_spec.rb

require 'rspec/given'

describe "Natural Assertions" do
  Given(:foo) { 1 }
  Given(:bar) { 2 }
  Then { foo + bar == 2 }
end