Merging Hashie::Mash now correctly only calls the block on duplicate values

1 files changed, 6 insertions, 0 deletions

diff --git a/spec/hashie/mash_spec.rb b/spec/hashie/mash_spec.rb
index 4f80a51..77adc25 100644
--- a/spec/hashie/mash_spec.rb
+++ b/spec/hashie/mash_spec.rb
@@ -189,6 +189,12 @@ describe Hashie::Mash do
         duped = subject.merge(details: { address: 'Pasadena CA' }) { |_, oldv, newv| [oldv, newv].join(', ') }
         expect(duped.details.address).to eq 'Nowhere road, Pasadena CA'
       end
+
+      it 'copies values for non-duplicate keys when a block is supplied' do
+        duped = subject.merge(details: { address: 'Pasadena CA', state: 'West Thoughtleby' }) { |_, oldv, _| oldv }
+        expect(duped.details.address).to eq 'Nowhere road'
+        expect(duped.details.state).to eq 'West Thoughtleby'
+      end
     end
 
     describe 'shallow update' do