diff --git a/spec/fuzzy_where/config_spec.rb b/spec/fuzzy_where/config_spec.rb
index 8016c77..8df87fa 100644
--- a/spec/fuzzy_where/config_spec.rb
+++ b/spec/fuzzy_where/config_spec.rb
@@ -83,5 +83,17 @@
         FuzzyWhere.configure { |c| c.predicates_file = nil }
       end
     end
+    context 'with forbidden predicates_file' do
+      let(:path) { FIXTURES_PATH.join('forbidden_predicates.yml') }
+      before do
+        FuzzyWhere.configure { |c| c.predicates_file = path }
+      end
+      it 'should raise FuzzyWhere::ConfigError' do
+        expect { config.fuzzy_predicate(:some_key) }.to raise_error(FuzzyWhere::ConfigError)
+      end
+      after do
+        FuzzyWhere.configure { |c| c.predicates_file = nil }
+      end
+    end
   end
 end