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Make use of practice exercise scenarios

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难度
4/5
预计耗时
3-5 天
新手友好度
35/100
Issue 类型
功能
描述清晰度
基本清楚
活跃度
停滞
技术栈
php
领域
testing

调研方向

首先检查 canonical-data.json 中列出的场景条目，以及使用这些条目的 PHP 练习测试生成器或学生存根。确定哪些场景从不实现、始终实现或可选实现，然后验证可选场景可以由提议的常量控制，并且所需的测试仍会按预期运行。

由索引模型根据 Issue 内容生成。

描述

Problem

Some practice exercises have scenarios "to allow for selectively including/excluding test cases based on a property of the test case". We currently have not defined how these are treated within the PHP track.

At the time of writing, these are the scenarios in use within exercises:

~/.cache/exercism/configlet/problem-specifications$ fgrep -H -e 'scenario' -r --include='*.json' exercises/
exercises/bank-account/canonical-data.json:      "scenarios": ["concurrent"],
exercises/dnd-character/canonical-data.json:      "scenarios": ["random"],
exercises/high-scores/canonical-data.json:          "scenarios": ["immutable"],
exercises/protein-translation/canonical-data.json:      "scenarios": ["input-validation", "runtime-validation"],
exercises/parallel-letter-frequency/canonical-data.json:      "scenarios": ["unicode"],
exercises/parallel-letter-frequency/canonical-data.json:      "scenarios": ["concurrent"],
exercises/reverse-string/canonical-data.json:      "scenarios": ["unicode"],
exercises/gigasecond/canonical-data.json:      "scenarios": ["date"],
exercises/gigasecond/canonical-data.json:      "scenarios": ["datetime"],
exercises/gigasecond/canonical-data.json:      "scenarios": ["immutable"],
exercises/diffie-hellman/canonical-data.json:      "scenarios": ["random"],
exercises/diffie-hellman/canonical-data.json:      "scenarios": ["immutable"],
exercises/forth/canonical-data.json:          "scenarios": ["local-scope"],
exercises/armstrong-numbers/canonical-data.json:      "scenarios": ["big-integer"],
exercises/simple-cipher/canonical-data.json:          "scenarios": ["random"],
exercises/triangle/canonical-data.json:          "scenarios": ["floating-point"],
exercises/anagram/canonical-data.json:      "scenarios": ["unicode"],

Suggestion

Scenarios can be grouped into categories based on how we want to treat them:

  • Never implemented: We do not implement those test cases at all.
  • Always implemented: We always include those test cases as required tests.
  • Optionally implemented: Students should be able to opt-in to implement their solution so they pass those test cases in addition to the required tests.

We decide, which scenarios we want to treat as "optional", "always" or "never". I think, this a way to use the categories:

  • Never implemented: concurrent, library-test, any unknown scenario
  • Always implemented: date, datetime, floating-point, local-scope
  • Optionally implemented: big-integer, immutable, input-validation, random, runtime-validation, unicode

Based on these categories, test generators can simply skip over "never" scenarios and treat "always" scenarios like "no scenario".

For the "optional" ones I suggest using PHP constants in students files (define('BIG_INTEGER', 1);) and inside the test methods if (!defined('BIG_INTEGER') || constant('BIG_INTEGER' !== 1)) { $this->markTestSkipped(); }. Using the functions to create / read the constants avoids the problems that arise, when including the students file into a class method (as we do in the test class).

The constants provide a means to easily pre-define them in the students stub file:

[...]

// Change this constant value to 1 if you want to test your solution using Unicode strings:
define('UNICODE', 0);

class ExerciseName
{
    [...]
}
主要语言
PHP
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环境准备

在 Codespaces 中打开

在浏览器里用你自己的 GitHub 账号启动这个项目的开发容器。

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  • 没有贡献指南

从这里开始

  1. 先读完整个 Issue，再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库，在一个分支上完成修改。
  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

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