使用事件和委托对类进行单元测试 [英] unit testing a class with event and delegate

问题描述

我是测试新手，请帮忙.

I am new to testing please help.

我有以下课程

public delegate void OnInvalidEntryMethod(ITnEntry entry, string message);

public class EntryValidator
{
    public event OnInvalidEntryMethod OnInvalidEntry;

    public bool IsValidEntry(ITnEntry entry, string ticker)
    {
        if (!IsFieldValid(entry, ticker.Trim().Length.ToString(), "0"))
            return false;

        return true;
    }

    private bool IsFieldValid(ITnEntry entry, string actual, string invalidValue)
    {
        if (actual == invalidValue)
        {
            RaiseInvalidEntryEvent(entry);
            return false;
        }

        return true;
    }

    private void RaiseInvalidEntryEvent(ITnEntry entry)
    {
        if (OnInvalidEntry != null)
            OnInvalidEntry(entry, "Invalid entry in list: " + entry.List.Name + ".");
    }
}

到目前为止，我已经编写了测试用例，但正在努力处理事件和委托，如下所示

I have written the test case so far but am struggling with the event and delegate as shown below

[TestFixture]
public class EntryValidatorTests
{
    private EntryValidator _entryValidator;

    private FakeTnEntry _selectedEntry;
    private string _ticker;

    [SetUp]
    public void Setup()
    {
        _entryValidator = new EntryValidator();
        _ticker = "BOL";
    }

    private FakeTnEntry MakeEntry(string ticker)
    {
        return new FakeTnEntry { Ticker = ticker};
    }

    [Test]
    public void IsValidEntry_WithValidValues()
    {
        _selectedEntry = MakeEntry(_ticker);

        Assert.IsTrue(_entryValidator.IsValidEntry(_selectedEntry, _selectedEntry.Ticker));
    }

    [Test]
    public void IsValidEntry_WithInValidTicker()
    {
        _selectedEntry = MakeEntry("");
        Assert.IsFalse(_entryValidator.IsValidEntry(_selectedEntry, _selectedEntry.Ticker));
    }
}}

请问有人可以帮忙吗?谢谢..

Please can someone help? Thanks..

推荐答案

使用匿名方法订阅事件可能是最简单的:

It's probably simplest just to subscribe to the event using an anonymous method:

[Test]
public void IsValidEntry_WithValidValues()
{
    _selectedEntry = MakeEntry(_ticker);
    _entryValidator.OnInvalidEntry += delegate { 
        Assert.Fail("Shouldn't be called");
    };

    Assert.IsTrue(_entryValidator.IsValidEntry(_selectedEntry, _selectedEntry.Ticker));
}    

[Test]
public void IsValidEntry_WithInValidTicker()
{
    bool eventRaised = false;
    _selectedEntry = MakeEntry("");
    _entryValidator.OnInvalidEntry += delegate { eventRaised = true; };

    Assert.IsFalse(_entryValidator.IsValidEntry(_selectedEntry, _selectedEntry.Ticker));
    Assert.IsTrue(eventRaised);
}

在第二个测试中，您可能想要验证事件参数是否也符合预期.

In the second test you might want to validate that the event arguments were as expected too.

还要注意无效"是一个词 - 所以你的测试应该是 IsValidEntry_WithInvalidTicker.我也不会为设置而烦恼 - 我只需在每个测试中声明新的局部变量.

Also note that "invalid" is one word - so your test should be IsValidEntry_WithInvalidTicker. I'd also not bother with the setup - I'd just declare new local variables in each test.

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