spec/unit/veritas/logic/predicate/exclusion/inverse_spec.rb in veritas-0.0.1 vs spec/unit/veritas/logic/predicate/exclusion/inverse_spec.rb in veritas-0.0.2

@@ -1,16 +1,22 @@
 require 'spec_helper'
 
 describe 'Veritas::Logic::Predicate::Exclusion#inverse' do
-  subject { exclusion.inverse }
+  subject { object.inverse }
 
-  let(:attribute) { Attribute::Integer.new(:id) }
-  let(:exclusion) { attribute.exclude([ 1 ])    }
+  let(:klass)      { Logic::Predicate::Exclusion      }
+  let(:attribute)  { Attribute::Integer.new(:id)      }
+  let(:enumerable) { [ 1 ].freeze                     }
+  let(:object)     { klass.new(attribute, enumerable) }
 
-  it { should eql(attribute.include([ 1 ])) }
+  it_should_behave_like 'an idempotent method'
 
+  it { should be_kind_of(Logic::Predicate::Inclusion) }
+
+  its(:left) { should equal(attribute) }
+
+  its(:right) { should equal(enumerable) }
+
   it 'is invertible' do
-    subject.inverse.should equal(exclusion)
+    subject.inverse.should equal(object)
   end
-
-  it_should_behave_like 'an idempotent method'
 end