diff --git a/test/unit/lib/redmine/scm/adapters/git_adapter_test.rb b/test/unit/lib/redmine/scm/adapters/git_adapter_test.rb
index 5e2d15af4..c4e5e1e91 100644
--- a/test/unit/lib/redmine/scm/adapters/git_adapter_test.rb
+++ b/test/unit/lib/redmine/scm/adapters/git_adapter_test.rb
@@ -384,6 +384,11 @@ begin
         assert_nil @adapter.annotate('invalid')
       end
 
+      def test_annotate_revision_invalid
+        assert     @adapter.annotate('README')
+        assert_nil @adapter.annotate('README', 'abcd1234efgh')
+      end
+
       private
 
       def test_scm_version_for(scm_command_version, version)