Prevent GitLab issue tracker spec from failing later specs

spec/models/project_services/gitlab_issue_tracker_service_spec.rb

@@ -23,38 +23,29 @@ describe GitlabIssueTrackerService, models: true do
 
   describe 'project and issue urls' do
     let(:project) { create(:empty_project) }
+    let(:service) { project.create_gitlab_issue_tracker_service(active: true) }
 
     context 'with absolute urls' do
       before do
-        GitlabIssueTrackerService.default_url_options[:script_name] = "/gitlab/root"
-        @service = project.create_gitlab_issue_tracker_service(active: true)
-      end
-
-      after do
-        @service.destroy!
+        allow(GitlabIssueTrackerService).to receive(:default_url_options).and_return(script_name: "/gitlab/root")
       end
 
       it 'gives the correct path' do
-        expect(@service.project_url).to eq("http://#{Gitlab.config.gitlab.host}/gitlab/root/#{project.path_with_namespace}/issues")
-        expect(@service.new_issue_url).to eq("http://#{Gitlab.config.gitlab.host}/gitlab/root/#{project.path_with_namespace}/issues/new")
-        expect(@service.issue_url(432)).to eq("http://#{Gitlab.config.gitlab.host}/gitlab/root/#{project.path_with_namespace}/issues/432")
+        expect(service.project_url).to eq("http://#{Gitlab.config.gitlab.host}/gitlab/root/#{project.path_with_namespace}/issues")
+        expect(service.new_issue_url).to eq("http://#{Gitlab.config.gitlab.host}/gitlab/root/#{project.path_with_namespace}/issues/new")
+        expect(service.issue_url(432)).to eq("http://#{Gitlab.config.gitlab.host}/gitlab/root/#{project.path_with_namespace}/issues/432")
       end
     end
 
     context 'with relative urls' do
       before do
-        GitlabIssueTrackerService.default_url_options[:script_name] = "/gitlab/root"
-        @service = project.create_gitlab_issue_tracker_service(active: true)
-      end
-
-      after do
-        @service.destroy!
+        allow(GitlabIssueTrackerService).to receive(:default_url_options).and_return(script_name: "/gitlab/root")
       end
 
       it 'gives the correct path' do
-        expect(@service.project_path).to eq("/gitlab/root/#{project.path_with_namespace}/issues")
-        expect(@service.new_issue_path).to eq("/gitlab/root/#{project.path_with_namespace}/issues/new")
-        expect(@service.issue_path(432)).to eq("/gitlab/root/#{project.path_with_namespace}/issues/432")
+        expect(service.project_path).to eq("/gitlab/root/#{project.path_with_namespace}/issues")
+        expect(service.new_issue_path).to eq("/gitlab/root/#{project.path_with_namespace}/issues/new")
+        expect(service.issue_path(432)).to eq("/gitlab/root/#{project.path_with_namespace}/issues/432")
       end
     end
   end