Fix test

Author: Aidan Haran

test/cases/coerced_tests.rb

@@ -1521,7 +1521,7 @@ def test_statement_cache_values_differ_coerced
 
       original_test_statement_cache_values_differ
     ensure
-      Book.where(author_id: nil, name: nil).delete_all
+      Book.where(author_id: nil, name: 'my book').delete_all
       Book.connection.add_index(:books, [:author_id, :name], unique: true)
     end
   end