Fix minor issues according development guidelines

doc/api/groups.md

@@ -140,7 +140,7 @@ PUT /groups/:id
 | `name` | string | no | The name of the group |
 | `path` | string | no | The path of the group |
 | `description` | string | no | The description of the group |
-| `visibility_level` | integer | no | The visibility_level of the group. 0 for private, 10 for internal, 20 for public. |
+| `visibility_level` | integer | no | The visibility level of the group. 0 for private, 10 for internal, 20 for public. |
 
 ```bash
 curl -X PUT -H "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/groups/5?name=Experimental"

lib/api/groups.rb

@@ -59,12 +59,10 @@ module API
 
         attrs = attributes_for_keys [:name, :path, :description, :visibility_level]
 
-        ::Groups::UpdateService.new(group, current_user, attrs).execute
-
-        if group.errors.any?
-          render_validation_error!(group)
-        else
+        if ::Groups::UpdateService.new(group, current_user, attrs).execute
           present group, with: Entities::GroupDetail
+        else
+          render_validation_error!(group)
         end
       end
 

spec/requests/api/groups_spec.rb

@@ -100,7 +100,7 @@ describe API::API, api: true  do
   describe 'PUT /groups/:id' do
     let(:new_group_name) { 'New Group'}
 
-    context "when authenticated the group owner" do
+    context 'when authenticated as the group owner' do
       it 'updates the group' do
         put api("/groups/#{group1.id}", user1), name: new_group_name
 
@@ -115,7 +115,7 @@ describe API::API, api: true  do
       end
     end
 
-    context "when authenticated the admin" do
+    context 'when authenticated as the admin' do
       it 'updates the group' do
         put api("/groups/#{group1.id}", admin), name: new_group_name
 
@@ -124,13 +124,21 @@ describe API::API, api: true  do
       end
     end
 
-    context "when authenticated an user" do
-      it 'updates the group' do
+    context 'when authenticated as an user that can see the group' do
+      it 'does not updates the group' do
         put api("/groups/#{group1.id}", user2), name: new_group_name
 
         expect(response.status).to eq(403)
       end
     end
+
+    context 'when authenticated as an user that cannot see the group' do
+      it 'returns 403 when trying to update the group' do
+        put api("/groups/#{group2.id}", user1), name: new_group_name
+
+        expect(response.status).to eq(403)
+      end
+    end
   end
 
   describe "GET /groups/:id/projects" do