func (s *ServiceLeaderSuite) TestTxnRevnoChange(c *gc.C) {
	defer state.SetBeforeHooks(c, s.State, func() {
		s.writeSettings(c, map[string]string{
			"other":   "values",
			"slipped": "in",
			"before":  "we",
			"managed": "to",
		})
	}).Check()

	s.writeSettings(c, map[string]string{
		"but":       "we",
		"overwrite": "those",
		"before":    "",
	})

	s.checkSettings(c, map[string]string{
		"other":     "values",
		"slipped":   "in",
		"but":       "we",
		"managed":   "to",
		"overwrite": "those",
	})
}