单元测试一个类与事件和委托

单元测试一个类与事件和委托

本文介绍了单元测试一个类与事件和委托的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

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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07-30 10:28