make tests work

spec/authority_browse/subjects_spec.rb

@@ -35,7 +35,7 @@
     it "fetches authority records from the alma api for a given set and generates a file with a list of marcxml authorities" do
       auth_stub = stub_authority_request
       set_stub = stub_set_request
-      file_path = "/app/tmp/auth_file.xml"
+      file_path = "#{S.project_root}/tmp/auth_file.xml"
       described_class.generate_remediated_authorities_file(file_path: file_path, set_id: set_id)
       expect(auth_stub).to have_been_requested
       expect(set_stub).to have_been_requested