consumable("b", {})
        }
        verifyUnlocked(ConfigurationRoles.CONSUMABLE, "c") {
            consumableUnlocked("c")
        }
        verifyUnlocked(ConfigurationRoles.CONSUMABLE, "d") {
            consumableUnlocked("d", {})
        }
        verifyUnlocked(ConfigurationRoles.CONSUMABLE, "e") {
            maybeCreateConsumableUnlocked("e")
        }
    }

    /**
     * Creates a consumable configuration which can change roles.
     */
    Configuration consumableUnlocked(String name);

    /**
     * Creates a consumable configuration which can change roles and executes the provided
     * {@code action} against the configuration.
     */
    Configuration consumableUnlocked(String name, Action<? super Configuration> action);

    /**