Remove invalid specs from releases finder

there's no requirement for subgroups/projects
with multiple permissions on this endpoint

app/finders/releases_finder.rb

@@ -38,19 +38,17 @@ class ReleasesFinder
       if parent.is_a?(Project)
         Ability.allowed?(current_user, :read_release, parent) ? [parent] : []
       elsif parent.is_a?(Group)
-        accessible_projects
+        Ability.allowed?(current_user, :read_release, parent) ? accessible_projects : []
       end
     end
   end
 
   def accessible_projects
-    projects = if include_subgroups?
-                 Project.for_group_and_its_subgroups(parent)
-               else
-                 parent.projects
-               end
-
-    projects.select { |project| Ability.allowed?(current_user, :read_release, project) }
+    if include_subgroups?
+      Project.for_group_and_its_subgroups(parent)
+    else
+      parent.projects
+    end
   end
 
   # rubocop: disable CodeReuse/ActiveRecord

app/policies/group_policy.rb

@@ -100,6 +100,7 @@ class GroupPolicy < Namespaces::GroupProjectNamespaceSharedPolicy
     enable :read_group
     enable :upload_file
     enable :guest_access
+    enable :read_release
   end
 
   rule { admin }.policy do

spec/controllers/groups/releases_controller_spec.rb

@@ -6,14 +6,14 @@ RSpec.describe Groups::ReleasesController do
   let(:group) { create(:group) }
   let!(:project)         { create(:project, :repository, :public, namespace: group) }
   let!(:private_project) { create(:project, :repository, :private, namespace: group) }
-  let(:developer)        { create(:user) }
+  let(:guest) { create(:user) }
   let!(:release_1)       { create(:release, project: project, tag: 'v1', released_at: Time.zone.parse('2020-02-15')) }
   let!(:release_2)       { create(:release, project: project, tag: 'v2', released_at: Time.zone.parse('2020-02-20')) }
   let!(:private_release_1)       { create(:release, project: private_project, tag: 'p1', released_at: Time.zone.parse('2020-03-01')) }
   let!(:private_release_2)       { create(:release, project: private_project, tag: 'p2', released_at: Time.zone.parse('2020-03-05')) }
 
   before do
-    private_project.add_developer(developer)
+    group.add_guest(guest)
   end
 
   describe 'GET #index' do
@@ -42,7 +42,7 @@ RSpec.describe Groups::ReleasesController do
         end
 
         it 'does not return any releases' do
-          expect(json_response.map {|r| r['tag'] } ).to match_array(%w(v2 v1))
+          expect(json_response.map {|r| r['tag'] } ).to be_empty
         end
 
         it 'returns OK' do
@@ -52,7 +52,7 @@ RSpec.describe Groups::ReleasesController do
 
       context 'the user is authorized' do
         it "returns all group's public and private project's releases as JSON, ordered by released_at" do
-          sign_in(developer)
+          sign_in(guest)
 
           subject
 

spec/finders/releases_finder_spec.rb

@@ -23,6 +23,16 @@ RSpec.describe ReleasesFinder do
     end
   end
 
+  shared_examples_for 'when the user is not part of the group' do
+    before do
+      allow(Ability).to receive(:allowed?).with(user, :read_release, group).and_return(false)
+    end
+
+    it 'returns no releases' do
+      is_expected.to be_empty
+    end
+  end
+
   # See https://gitlab.com/gitlab-org/gitlab/-/merge_requests/27716
   shared_examples_for 'when tag is nil' do
     before do
@@ -66,9 +76,9 @@ RSpec.describe ReleasesFinder do
 
     it_behaves_like 'when the user is not part of the project'
 
-    context 'when the user is a project developer' do
+    context 'when the user is a project guest' do
       before do
-        project.add_developer(user)
+        project.add_guest(user)
       end
 
       it 'sorts by release date' do
@@ -118,25 +128,24 @@ RSpec.describe ReleasesFinder do
 
       subject { described_class.new(group, user, params).execute(**args) }
 
-      it_behaves_like 'when the user is not part of the project'
+      it_behaves_like 'when the user is not part of the group'
 
-      context 'when the user is a project developer on one sibling project' do
+      context 'when the user is a project guest on one sibling project' do
         before do
-          project.add_developer(user)
+          project.add_guest(user)
           v1_0_0.update_attribute(:released_at, 3.days.ago)
           v1_1_0.update_attribute(:released_at, 1.day.ago)
         end
 
-        it 'sorts by release date' do
-          expect(subject.size).to eq(2)
-          expect(subject).to eq([v1_1_0, v1_0_0])
+        it 'does not return any releases' do
+          expect(subject.size).to eq(0)
+          expect(subject).to eq([])
         end
       end
 
-      context 'when the user is a project developer on all projects' do
+      context 'when the user is a guest on the group' do
         before do
-          project.add_developer(user)
-          project2.add_developer(user)
+          group.add_guest(user)
           v1_0_0.update_attribute(:released_at, 3.days.ago)
           v6.update_attribute(:released_at, 2.days.ago)
           v1_1_0.update_attribute(:released_at, 1.day.ago)
@@ -161,22 +170,21 @@ RSpec.describe ReleasesFinder do
         let(:project2) { create(:project, :repository, namespace: subgroup) }
         let!(:v6)      { create(:release, project: project2, tag: 'v6') }
 
-        it_behaves_like 'when the user is not part of the project'
+        it_behaves_like 'when the user is not part of the group'
 
-        context 'when the user a project developer in the subgroup project' do
+        context 'when the user a project guest in the subgroup project' do
           before do
-            project2.add_developer(user)
+            project2.add_guest(user)
           end
 
-          it 'returns only the subgroup releases' do
-            expect(subject).to match_array([v6])
+          it 'does not return any releases' do
+            expect(subject).to match_array([])
           end
         end
 
-        context 'when the user a project developer in both projects' do
+        context 'when the user is a guest on the group' do
           before do
-            project.add_developer(user)
-            project2.add_developer(user)
+            group.add_guest(user)
             v6.update_attribute(:released_at, 2.days.ago)
           end
 
@@ -201,34 +209,32 @@ RSpec.describe ReleasesFinder do
           p3.update_attribute(:released_at, 3.days.ago)
         end
 
-        it_behaves_like 'when the user is not part of the project'
+        it_behaves_like 'when the user is not part of the group'
 
-        context 'when the user a project developer in the subgroup and subsubgroup project' do
+        context 'when the user a project guest in the subgroup and subsubgroup project' do
           before do
-            project2.add_developer(user)
-            project3.add_developer(user)
+            project2.add_guest(user)
+            project3.add_guest(user)
           end
 
-          it 'returns only the subgroup and subsubgroup releases' do
-            expect(subject).to match_array([v6, p3])
+          it 'does not return any releases' do
+            expect(subject).to match_array([])
           end
         end
 
-        context 'when the user a project developer in the subsubgroup project' do
+        context 'when the user a project guest in the subsubgroup project' do
           before do
-            project3.add_developer(user)
+            project3.add_guest(user)
           end
 
-          it 'returns only the subsubgroup releases' do
-            expect(subject).to match_array([p3])
+          it 'does not return any releases' do
+            expect(subject).to match_array([])
           end
         end
 
-        context 'when the user a project developer in all projects' do
+        context 'when the user a guest on the group' do
           before do
-            project.add_developer(user)
-            project2.add_developer(user)
-            project3.add_developer(user)
+            group.add_guest(user)
           end
 
           it 'returns all releases' do