public boolean deleteRole(Role role) {
        return rolesConfig.remove(role);
    }
@Test
    public void shouldReturnTrueIfDeletingARoleGoesThroughSuccessfully() throws Exception {
        SecurityConfig securityConfig = security(passwordFileAuthConfig(), admins());
        securityConfig.deleteRole(ROLE1);

        assertUserRoles(securityConfig, "chris", ROLE2);
        assertUserRoles(securityConfig, "jez");
    }