diff --git a/app/models/standard_identifiers.rb b/app/models/standard_identifiers.rb
index 1946967..59a6abb 100644
--- a/app/models/standard_identifiers.rb
+++ b/app/models/standard_identifiers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class StandardIdentifiers
   attr_reader :identifiers
 
diff --git a/test/controllers/graphql_controller_test.rb b/test/controllers/graphql_controller_test.rb
index 33c356d..981f2cb 100644
--- a/test/controllers/graphql_controller_test.rb
+++ b/test/controllers/graphql_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class GraphqlControllerTest < ActionDispatch::IntegrationTest
@@ -50,7 +52,6 @@ class GraphqlControllerTest < ActionDispatch::IntegrationTest
   end
 
   test 'search event query can return detected standard identifiers' do
-    initial_term_count = Term.count
     post '/graphql', params: { query: '{
                                  logSearchEvent(sourceSystem: "timdex", searchTerm: "10.1038/nphys1170") {
                                   standardIdentifiers {