Add tests for temp double write method

spec/models/application_qualification_spec.rb

@@ -44,6 +44,31 @@
     end
   end
 
+  describe '#enic_reference=' do
+    context 'when value is present' do
+      it 'sets enic_reason to :obtained' do
+        application_form = create(:application_form)
+        application_qualification = create(:application_qualification, application_form: application_form)
+
+        application_qualification.enic_reference = '12345'
+        expect(application_qualification.enic_reason).to eq('obtained')
+      end
+    end
+
+    context 'when value is not present' do
+      it 'sets enic_reason to :maybe' do
+        application_form = create(:application_form)
+        application_qualification = create(:application_qualification, application_form: application_form)
+
+        application_qualification.enic_reference = nil
+        expect(application_qualification.enic_reason).to eq('maybe')
+
+        application_qualification.enic_reference = ''
+        expect(application_qualification.enic_reason).to eq('maybe')
+      end
+    end
+  end
+
   describe 'auditing', :with_audited do
     it 'creates audit entries' do
       application_form = create(:application_form)