多输入单元测试 [英] Unit testing with multiple inputs

问题描述

我一直在试图环绕单元测试我的头，我试图处理单元测试的返回值取决于一堆参数的函数。有很多的信息，但是，这是一个有点势不可挡。

I've been trying to wrap my head around unit testing and I'm trying to deal with unit testing a function whose return value depends on a bunch of parameters. There's a lot of information however and it's a bit overwhelming..

考虑以下几点：

我有一个类文章，其价格的集合。它有一个方法 GetCurrentPrice 它根据一些规则目前的价格：

I have a class Article, which has a collection of prices. It has a method GetCurrentPrice which determines the current price based on a few rules:

public class Article
{
    public string Id { get; set; }
    public string Description { get; set; }
    public List<Price> Prices { get; set; }

    public Article()
    {
        Prices = new List<Price>();
    }

    public Price GetCurrentPrice()
    {
        if (Prices == null)
            return null;

        return (
            from
            price in Prices

            where

            price.Active &&
            DateTime.Now >= price.Start &&
            DateTime.Now <= price.End

            select price)
            .OrderByDescending(p => p.Type)
            .FirstOrDefault();
    }
}

的

PriceType 枚举和价格类：

public enum PriceType
{
    Normal = 0,
    Action = 1
}

public class Price
{
    public string Id { get; set; }
    public string Description { get; set; }
    public decimal Amount { get; set; }
    public PriceType Type { get; set; }
    public DateTime Start { get; set; }
    public DateTime End { get; set; }
    public bool Active { get; set; }
}

我想创建为一个单元测试 GetCurrentPrice 方法。基本上，我想测试可能可能发生的所有规则的组合，所以我必须创建多篇文章，以遏制房价的各种组合来获得全覆盖。

I want to create a unit test for the GetCurrentPrice method. Basically I want to test all combinations of rules that could possibly occur, so I would have to create multiple articles to contain various combinations of prices to get full coverage.

我单元测试m的思维像这样的（伪）：

I'm thinking of a unit test such as this (pseudo):

[TestMethod()]
public void GetCurrentPriceTest()
{
    var articles = getTestArticles();
    foreach (var article in articles)
    {
        var price = article.GetCurrentPrice();
        // somehow compare the gotten price to a predefined value
    } 
}

• 我读过，多个断言是邪恶的，但没有我需要
  他们在这里测试的所有条件？或者，我需要每个条件一个独立的单元
  测试？

  • I've read that 'multiple asserts are evil', but don't I need them to test all conditions here? Or would I need a separate unit test per condition?

    我怎么会去提供单元测试用一组测试数据？
    我应该嘲笑一个资料库？并应这些数据还包括
    的预期值？

    How would I go about providing the unit test with a set of test data? Should I mock a repository? And should that data also include the expected values?

    推荐答案

    你没有使用在这个例子中一个仓库，所以没有必要嘲笑什么。你可以做的就是为不同的可能的输入创建多个单元测试：

    You are not using a repository in this example so there's no need to mock anything. What you could do is to create multiple unit tests for the different possible inputs:

    [TestMethod]
    public void Foo()
    {
        // arrange
        var article = new Article();
        // TODO: go ahead and populate the Prices collection with dummy data
    
    
        // act
        var actual = article.GetCurrentPrice();
    
        // assert
        // TODO: assert on the actual price returned by the method
        // depending on what you put in the arrange phase you know
    }
    

    等等，你可以添加其他的单元测试，你只会修改安排每一个可能的输入和断言阶段。

    and so on you could add other unit tests where you would only change the arrange and assert phases for each possible input.

    这篇关于多输入单元测试的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！