fix spec

spec/requests/api/snippets_spec.rb

@@ -255,6 +255,7 @@ describe API::Snippets do
   end
 
   describe 'DELETE /snippets/:id' do
+    let!(:public_snippet) { create(:personal_snippet, :public, author: user) }
     it 'deletes snippet' do
       expect do
         delete api("/snippets/#{public_snippet.id}", user)