item.rb

require "dm-core"
require "dm-timestamps"

class Item
  include DataMapper::Resource

  property :id,        Serial
  property :title,     String
  property :category,  String
  property :completed, Boolean
end

item_spec.rb

require "spec_helper"

describe Item do
  it { should have_property :id        }
  it { should have_property :title     }
  it { should have_property :category  }
  it { should have_property :completed }

  it "starts as incomplete"

  it "can be completed"
end

RSpec output

*FFF*F

Pending:
  Item can be completed
    # Not yet implemented
    # ./spec/models/item_spec.rb:11
  Item starts as incomplete
    # Not yet implemented
    # ./spec/models/item_spec.rb:9

Failures:

  1) Item 
     Failure/Error: it { should have_property :title     }
     NoMethodError:
       undefined method `has_property?' for #<Item @id=nil @title=nil @category=nil @completed=nil>
     # ./spec/models/item_spec.rb:5:in `block (2 levels) in <top (required)>'

  2) Item 
     Failure/Error: it { should have_property :id        }
     NoMethodError:
       undefined method `has_property?' for #<Item @id=nil @title=nil @category=nil @completed=nil>
     # ./spec/models/item_spec.rb:4:in `block (2 levels) in <top (required)>'

  3) Item 
     Failure/Error: it { should have_property :category  }
     NoMethodError:
       undefined method `has_property?' for #<Item @id=nil @title=nil @category=nil @completed=nil>
     # ./spec/models/item_spec.rb:6:in `block (2 levels) in <top (required)>'

  4) Item 
     Failure/Error: it { should have_property :completed }
     NoMethodError:
       undefined method `has_property?' for #<Item @id=nil @title=nil @category=nil @completed=nil>
     # ./spec/models/item_spec.rb:7:in `block (2 levels) in <top (required)>'

Finished in 0.00216 seconds
6 examples, 4 failures, 2 pending

Failed examples:

rspec ./spec/models/item_spec.rb:5 # Item 
rspec ./spec/models/item_spec.rb:4 # Item 
rspec ./spec/models/item_spec.rb:6 # Item 
rspec ./spec/models/item_spec.rb:7 # Item 

spec_helper.rb

$LOAD_PATH.unshift File.join(File.dirname(__FILE__), "..")
# raise $LOAD_PATH.inspect
require "my_leisure_list"
require "dm-rspec"
# This file was generated by the `rspec --init` command. Conventionally, all
# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
# Require this file using `require "spec_helper"` to ensure that it is only
# loaded once.
#
# See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
RSpec.configure do |config|
  config.include(DataMapper::Matchers)
  config.treat_symbols_as_metadata_keys_with_true_values = true
  config.run_all_when_everything_filtered = true
  config.filter_run :focus

  # Run specs in random order to surface order dependencies. If you find an
  # order dependency and want to debug it, you can fix the order by providing
  # the seed, which is printed after each run.
  #     --seed 1234
  config.order = 'random'
end