Move promote to put and add more specs

doc/api/labels.md

@@ -193,7 +193,7 @@ Example response:
 Promotes a project label to a group label.
 
 ```
-POST /projects/:id/labels/promote
+PUT /projects/:id/labels/promote
 ```
 
 | Attribute       | Type    | Required                          | Description                      |
@@ -202,7 +202,7 @@ POST /projects/:id/labels/promote
 | `name`          | string  | yes                               | The name of the existing label   |
 
 ```bash
-curl --request POST --data "name=documentation" --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/1/labels/promote"
+curl --request PUT --data "name=documentation" --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/1/labels/promote"
 ```
 
 Example response:

lib/api/labels.rb

@@ -70,7 +70,7 @@ module API
       params do
         requires :name, type: String, desc: 'The name of the label to be promoted'
       end
-      post ':id/labels/promote' do
+      put ':id/labels/promote' do
         authorize! :admin_label, user_project
 
         label = find_label(user_project, params[:name], include_ancestor_groups: false)

spec/requests/api/labels_spec.rb

@@ -473,23 +473,47 @@ describe API::Labels do
     end
   end
 
-  describe 'POST /projects/:id/labels/promote' do
+  describe 'PUT /projects/:id/labels/promote' do
+    let(:group) { create(:group) }
+
+    before do
+      project.update(group: group)
+    end
+
     it 'returns 200 if label is promoted' do
-      post api("/projects/#{project.id}/labels/promote", user), params: { name: 'label1' }
+      put api("/projects/#{project.id}/labels/promote", user), params: { name: label1.name }
 
       expect(response).to have_gitlab_http_status(200)
       expect(json_response['name']).to eq(label1.name)
-      expect(json_response['color']).to eq('#FFFFFF')
+      expect(json_response['color']).to eq(label1.color)
+    end
+
+    it 'returns 400 if group label already exists' do
+      create(:group_label, title: label1.name, group: group)
+
+      put api("/projects/#{project.id}/labels/promote", user), params: { name: label1.name }
+
+      expect(response).to have_gitlab_http_status(400)
+      expect(json_response['message']).to eq('Failed to promote project label to group label')
+    end
+
+    it 'returns 403 if guest promotes label' do
+      guest = create(:user)
+      project.add_guest(guest)
+
+      put api("/projects/#{project.id}/labels/promote", guest), params: { name: label1.name }
+
+      expect(response).to have_gitlab_http_status(403)
     end
 
     it 'returns 404 if label does not exist' do
-      post api("/projects/#{project.id}/labels/promote", user), params: { name: 'unknown' }
+      put api("/projects/#{project.id}/labels/promote", user), params: { name: 'unknown' }
 
       expect(response).to have_gitlab_http_status(404)
     end
 
     it 'returns 400 if no label name given' do
-      post api("/projects/#{project.id}/labels/promote", user)
+      put api("/projects/#{project.id}/labels/promote", user)
 
       expect(response).to have_gitlab_http_status(400)
       expect(json_response['error']).to eq('name is missing')