单元测试一个类与事件和委托 [英] unit testing a class with event and delegate

问题描述

我有以下课程

  public delegate void OnInvalidEntryMethod（ITnEntry条目，字符串消息）; 
 
 public class EntryValidator 
 {
 public event OnInvalidEntryMethod OnInvalidEntry; 
 
 public bool IsValidEntry（ITnEntry条目，字符串代码）
 {
 if（！IsFieldValid（entry，ticker.Trim（）。Length.ToString（），0） ）
 return false; 
 
返回true; 
} 
 
私人bool IsFieldValid（ITnEntry条目，字符串实际，字符串无效值）
 {
 if（actual == invalidValue）
 {
 RaiseInvalidEntryEvent（entry）; 
返回false; 
} 
 
返回true; 
 
 
 private void RaiseInvalidEntryEvent（ITnEntry条目）
 {
 if（OnInvalidEntry！= null）
 OnInvalidEntry（条目列表中的无效条目： + entry.List.Name +。）; 
} 
} 
  

我已经写了测试案例，但是正在努力事件和委托如下所示

  [TestFixture] 
 public class EntryValidatorTests 
 {
 private EntryValidator _entryValidator; 
 
 private FakeTnEntry _selectedEntry; 
私人字符串_ticker; 
 
 [SetUp] 
 public void Setup（）
 {
 _entryValidator = new EntryValidator（）; 
 _ticker =BOL; 
} 
 
 private FakeTnEntry MakeEntry（string ticker）
 {
返回新的FakeTnEntry {Ticker = ticker}; 
} 
 
 [测试] 
 public void IsValidEntry_WithValidValues（）
 {
 _selectedEntry = MakeEntry（_ticker）; 
 
 Assert.IsTrue（_entryValidator.IsValidEntry（_selectedEntry，_selectedEntry.Ticker））; 
} 
 
 [测试] 
 public void IsValidEntry_WithInValidTicker（）
 {
 _selectedEntry = MakeEntry（）; 
 Assert.IsFalse（_entryValidator.IsValidEntry（_selectedEntry，_selectedEntry.Ticker））; 
} 
}} 
  

有人可以帮忙吗？谢谢..

解决方案

使用匿名方法订阅该事件可能最简单：

  [Test] 
 public void IsValidEntry_WithValidValues（）
 {
 _selectedEntry = MakeEntry（_ticker）; 
 _entryValidator.OnInvalidEntry + = delegate {
 Assert.Fail（不应该被调用）; 
}; 
 
 Assert.IsTrue（_entryValidator.IsValidEntry（_selectedEntry，_selectedEntry.Ticker））; 
} 
 
 [测试] 
 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，您可能需要验证事件参数是否符合预期

另请注意，无效是一个字，因此您的测试应为 IsValidEntry_WithInvalidTicker 。我也没有打扰设置 - 我只是在每个测试中声明新的局部变量。

I am new to testing please help.

I have the following class

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 + ".");
    }
}

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));
    }
}}

Please can someone help? Thanks..

解决方案

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);
}

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

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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