Bug: Migrate messages while merging contact (#624)

Bug: Migrate messages while merging contact

spec/actions/contact_merge_action_spec.rb

@@ -10,6 +10,7 @@ describe ::ContactMergeAction do
   before do
     2.times.each { create(:conversation, contact: base_contact) }
     2.times.each { create(:conversation, contact: mergee_contact) }
+    2.times.each { create(:message, contact: mergee_contact) }
   end
 
   describe '#perform' do
@@ -32,6 +33,13 @@ describe ::ContactMergeAction do
       end
     end
 
+    context 'when mergee contact has messages' do
+      it 'moves the messages to base contact' do
+        contact_merge
+        expect(base_contact.messages.count).to be 2
+      end
+    end
+
     context 'when contacts belong to a different account' do
       it 'throws an exception' do
         new_account = create(:account)