1 files changed, 60 insertions, 0 deletions
diff --git a/spec/requests/api/graphql/project/fork_details_spec.rb b/spec/requests/api/graphql/project/fork_details_spec.rb
new file mode 100644
index 00000000000..efd48b00833
--- /dev/null
+++ b/spec/requests/api/graphql/project/fork_details_spec.rb
@@ -0,0 +1,60 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'getting project fork details', feature_category: :source_code_management do
+  include GraphqlHelpers
+  include ProjectForksHelper
+
+  let_it_be(:project) { create(:project, :public, :repository_private, :repository) }
+  let_it_be(:current_user) { create(:user, maintainer_projects: [project]) }
+  let_it_be(:forked_project) { fork_project(project, current_user, repository: true) }
+
+  let(:queried_project) { forked_project }
+
+  let(:query) do
+    graphql_query_for(:project,
+      { full_path: queried_project.full_path }, <<~QUERY
+      forkDetails(ref: "feature"){
+        ahead
+        behind
+      }
+      QUERY
+    )
+  end
+
+  it 'returns fork details' do
+    post_graphql(query, current_user: current_user)
+
+    expect(graphql_data['project']['forkDetails']).to eq(
+      { 'ahead' => 1, 'behind' => 29 }
+    )
+  end
+
+  context 'when a project is not a fork' do
+    let(:queried_project) { project }
+
+    it 'does not return fork details' do
+      post_graphql(query, current_user: current_user)
+
+      expect(graphql_data['project']['forkDetails']).to be_nil
+    end
+  end
+
+  context 'when a user cannot read the code' do
+    let_it_be(:current_user) { create(:user) }
+
+    before do
+      forked_project.update!({
+                               repository_access_level: 'private',
+                               merge_requests_access_level: 'private'
+                             })
+    end
+
+    it 'does not return fork details' do
+      post_graphql(query, current_user: current_user)
+
+      expect(graphql_data['project']['forkDetails']).to be_nil
+    end
+  end
+end