spec/lib/danica/sum_spec.rb in danica-2.0.3 vs spec/lib/danica/sum_spec.rb in danica-2.0.4

@@ -1,10 +1,26 @@
 require 'spec_helper'
 
 describe Danica::Sum do
   subject { described_class.new(10, 2) }
 
-  it_behaves_like 'an object with + operation'
+  it_behaves_like 'an object that respond to basic_methods'
+
+  it_behaves_like 'an object with basic operation', operations: %i(* /)
+  it_behaves_like 'an object with + operation' do
+    let(:subject_included) { 10 }
+
+    context 'when other is also a sum' do
+      let(:other) { described_class.new(200, 5) }
+
+      it 'includes the sum parcels' do
+        expect(result).to include(200)
+      end
+    end
+  end
+  it_behaves_like 'an object with - operation' do
+    let(:subject_included) { 10 }
+  end
 
   it_behaves_like 'a operator that joins many variables with same operation', {
     calculated: 10,
     numeric_variables: [ 1.5, 2.5, 3.5 ],
     to_tex: {