Add a spec when ressource is not modified

lib/api/projects.rb

@@ -365,8 +365,7 @@ module API
         authorize! :remove_fork_project, user_project
         if user_project.forked?
-          status 204
-          user_project.forked_project_link.destroy
+          destroy_conditionally!(user_project.forked_project_link)
         else
           not_modified!
         end
@@ -410,8 +409,7 @@ module API
         link = user_project.project_group_links.find_by(group_id: params[:group_id])
         not_found!('Group Link') unless link
-        status 204
-        link.destroy
+        destroy_conditionally!(link)
       end
       desc 'Upload a file'

spec/requests/api/projects_spec.rb

@@ -1541,6 +1541,7 @@ describe API::Projects do
       end
       it_behaves_like '412 response' do
+        let(:success_status) { 202 }
         let(:request) { api("/projects/#{project.id}", user) }
       end
@@ -1576,6 +1577,7 @@ describe API::Projects do
       end
       it_behaves_like '412 response' do
+        let(:success_status) { 202 }
         let(:request) { api("/projects/#{project.id}", admin) }
       end
     end

spec/support/shared_examples/requests/api/status_shared_examples.rb

@@ -43,11 +43,25 @@ end
 shared_examples_for '412 response' do
   let(:params) { nil }
-  before do
-    delete request, params, { 'HTTP_IF_UNMODIFIED_SINCE' => '1990-01-12T00:00:48-0600' }
+  let(:success_status) { 204 }
+
+  context 'for a modified ressource' do
+    before do
+      delete request, params, { 'HTTP_IF_UNMODIFIED_SINCE' => '1990-01-12T00:00:48-0600' }
+    end
+
+    it 'returns 412' do
+      expect(response).to have_gitlab_http_status(412)
+    end
   end
-  it 'returns 412' do
-    expect(response).to have_gitlab_http_status(412)
+  context 'for an unmodified ressource' do
+    before do
+      delete request, params, { 'HTTP_IF_UNMODIFIED_SINCE' => Time.now }
+    end
+
+    it 'returns accepted' do
+      expect(response).to have_gitlab_http_status(success_status)
+    end
   end
 end