From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00
	autolearn=unavailable autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Tests in a software release
Date: Wed, 15 Nov 2017 21:46:34 +0100
Organization: Aioe.org NNTP Server
Message-ID: <oui938$1rb6$2@gioia.aioe.org>
References: <osqoph$1ves$1@gioia.aioe.org> <oss2c3$1p2m$1@gioia.aioe.org>
 <osvsjs$t4b$1@dont-email.me> <osvvds$s97$1@gioia.aioe.org>
 <ot19fo$7mi$2@dont-email.me> <ot1bvm$ub7$1@gioia.aioe.org>
 <ot82v3$h2c$1@dont-email.me> <ot83l0$1rb1$1@gioia.aioe.org>
 <ot981s$7m5$1@dont-email.me> <ot9cfr$1k6s$1@gioia.aioe.org>
 <oth5k4$eih$1@dont-email.me> <oug0n1$h7m$1@franka.jacob-sparre.dk>
 <ouhv6m$cig$1@dont-email.me>
NNTP-Posting-Host: MajGvm9MbNtGBKE7r8NgYA.user.gioia.aioe.org
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
X-Complaints-To: abuse@aioe.org
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101
 Thunderbird/52.4.0
X-Notice: Filtered by postfilter v. 0.8.2
Content-Language: en-US
Xref: feeder.eternal-september.org comp.lang.ada:48914
Date: 2017-11-15T21:46:34+01:00
List-Id: <comp.lang.ada>

On 2017-11-15 18:57, G. B. wrote:

> The most important thing is, designing by contract
> is *not* programming defensively.

It exactly is. In both cases no assumptions beyond known preconditions 
are made. Ada was especially designed to uphold defensive programming. 
E.g. case requires others alternative:

    I : Positive := 1;

    case I is
       when 1 =>
          ...
       when others => -- Defensive and mandatory
          ...
    end case;

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de