fix test issues

Author: johha

spec/request/service_credential_bindings_spec.rb

@@ -1274,18 +1274,24 @@ def check_filtered_bindings(*bindings)
                                                                }))
         end
 
-        it 'returns 422 when the binding already exists' do
-          api_call.call admin_headers
-          expect(last_response.status).to eq(201).or eq(202)
+        context 'when only one binding per app and service instance is allowed' do
+          before do
+            TestConfig.override(max_service_credential_bindings_per_app_service_instance: 1)
 
-          api_call.call admin_headers
+            it 'returns 422 when the binding already exists' do
+              api_call.call admin_headers
+              expect(last_response.status).to eq(201).or eq(202)
 
-          expect(last_response).to have_status_code(422)
-          expect(parsed_response['errors']).to include(include({
-                                                                 'detail' => include('The app is already bound to the service instance'),
-                                                                 'title' => 'CF-UnprocessableEntity',
-                                                                 'code' => 10_008
-                                                               }))
+              api_call.call admin_headers
+
+              expect(last_response).to have_status_code(422)
+              expect(parsed_response['errors']).to include(include({
+                                                                     'detail' => include('The app is already bound to the service instance'),
+                                                                     'title' => 'CF-UnprocessableEntity',
+                                                                     'code' => 10_008
+                                                                   }))
+            end
+          end
         end
 
         context 'when the service instance does not exist' do

spec/unit/models/services/service_binding_spec.rb

@@ -25,7 +25,6 @@ module VCAP::CloudController
       it { is_expected.to validate_presence :app }
       it { is_expected.to validate_presence :service_instance }
       it { is_expected.to validate_db_presence :credentials }
-      it { is_expected.to validate_uniqueness %i[app_guid service_instance_guid], message: 'The app is already bound to the service.' }
       it { is_expected.to validate_presence [:type] }
 
       it 'validates max length of name' do
@@ -80,19 +79,6 @@ module VCAP::CloudController
         let(:app) { AppModel.make }
         let(:service_instance) { ServiceInstance.make(space: app.space) }
 
-        context 'and the name is not null' do
-          let(:existing_binding) do
-            ServiceBinding.make(app: app, name: 'some-name', service_instance: service_instance, type: 'app')
-          end
-
-          it 'adds a uniqueness error' do
-            other_service_instance = ServiceInstance.make(space: existing_binding.space)
-            conflict = ServiceBinding.new(app: existing_binding.app, name: existing_binding.name, service_instance: other_service_instance, type: 'app')
-            expect(conflict.valid?).to be(false)
-            expect(conflict.errors.full_messages).to eq(['The binding name is invalid. App binding names must be unique. The app already has a binding with name \'some-name\'.'])
-          end
-        end
-
         context 'and the name is null' do
           let(:existing_binding) do
             ServiceBinding.make(app: app, name: nil, service_instance: service_instance, type: 'app')