1 files changed, 32 insertions, 0 deletions
diff --git a/spec/models/project_services/issue_tracker_service_spec.rb b/spec/models/project_services/issue_tracker_service_spec.rb
new file mode 100644
index 00000000000..fbe6f344a98
--- /dev/null
+++ b/spec/models/project_services/issue_tracker_service_spec.rb
@@ -0,0 +1,32 @@
+require 'spec_helper'
+
+describe IssueTrackerService, models: true do
+  describe 'Validations' do
+    let(:project) { create :project }
+
+    describe 'only one issue tracker per project' do
+      let(:service) { RedmineService.new(project: project, active: true) }
+
+      before do
+        create(:service, project: project, active: true, category: 'issue_tracker')  
+      end
+
+      context 'when service is changed manually by user' do
+        it 'executes the validation' do
+          valid = service.valid?(:manual_change)
+
+          expect(valid).to be_falsey
+          expect(service.errors[:base]).to include(
+            'Another issue tracker is already in use. Only one issue tracker service can be active at a time'
+          )
+        end
+      end
+
+      context 'when service is changed internally' do
+        it 'does not execute the validation' do
+          expect(service.valid?).to be_truthy
+        end
+      end
+    end
+  end
+end