mstest实现类似单元测试nunit中assert.throws功能
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了mstest实现类似单元测试nunit中assert.throws功能,小编现在分享给大家,供广大互联网技能从业者学习和参考。文章包含3111字,纯文字阅读大概需要5分钟。
内容图文
![mstest实现类似单元测试nunit中assert.throws功能](/upload/InfoBanner/zyjiaocheng/379/05057995b7d3435e947ff0c2adf71fff.jpg)
我们做单元测试NUnit中,有一个断言Assert.Throws很好用,但当我们使用MsTest时你需要这样写:
代码如下:
[TestMethod]
[ExpectedException(typeof(ArgumentNullException))]
public void WriteToTextFile()
{
PDFUtility.WriteToTextFile("D:\\ACA.pdf", null);
}
现在让我们来扩展一下也实现类似成功能,增加一个类,代码如下:
代码如下:
/// <summary>
/// Useful assertions for actions that are expected to throw an exception.
/// </summary>
public static class ExceptionAssert
{
/// <summary>
/// Executes an exception, expecting an exception to be thrown.
/// Like Assert.Throws in NUnit.
/// </summary>
/// <param name="action">The action to execute</param>
/// <returns>The exception thrown by the action</returns>
public static Exception Throws(Action action)
{
return Throws(action, null);
}
/// <summary>
/// Executes an exception, expecting an exception to be thrown.
/// Like Assert.Throws in NUnit.
/// </summary>
/// <param name="action">The action to execute</param>
/// <param name="message">The error message if the expected exception is not thrown</param>
/// <returns>The exception thrown by the action</returns>
public static Exception Throws(Action action, string message)
{
try
{
action();
}
catch (Exception ex)
{
// The action method has thrown the expected exception.
// Return the exception, in case the unit test wants to perform further assertions on it.
return ex;
}
// If we end up here, the expected exception was not thrown. Fail!
throw new AssertFailedException(message ?? "Expected exception was not thrown.");
}
/// <summary>
/// Executes an exception, expecting an exception of a specific type to be thrown.
/// Like Assert.Throws in NUnit.
/// </summary>
/// <param name="action">The action to execute</param>
/// <returns>The exception thrown by the action</returns>
public static T Throws<T>(Action action) where T : Exception
{
return Throws<T>(action, null);
}
/// <summary>
/// Executes an exception, expecting an exception of a specific type to be thrown.
/// Like Assert.Throws in NUnit.
/// </summary>
/// <param name="action">The action to execute</param>
/// <param name="message">The error message if the expected exception is not thrown</param>
/// <returns>The exception thrown by the action</returns>
public static T Throws<T>(Action action, string message) where T : Exception
{
try
{
action();
}
catch (Exception ex)
{
T actual = ex as T;
if (actual == null)
{
throw new AssertFailedException(message ?? String.Format("Expected exception of type {0} not thrown. Actual exception type was {1}.", typeof(T), ex.GetType()));
}
// The action method has thrown the expected exception of type 'T'.
// Return the exception, in case the unit test wants to perform further assertions on it.
return actual;
}
// If we end up here, the expected exception of type 'T' was not thrown. Fail!
throw new AssertFailedException(message ?? String.Format("Expected exception of type {0} not thrown.", typeof(T)));
}
}
好了,现在我们在MsTest中可以这样了,看下面代码:
代码如下:
[TestMethod]
public void WriteToTextFile2()
{
//Implement Assert.Throws in MSTest
ExceptionAssert.Throws<ArgumentNullException>(()=> PDFUtility.WriteToTextFile("D:\\ACA.pdf", null)
,"Output file path should not be null");
}
内容总结
以上是互联网集市为您收集整理的mstest实现类似单元测试nunit中assert.throws功能全部内容,希望文章能够帮你解决mstest实现类似单元测试nunit中assert.throws功能所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错,欢迎将互联网集市网站推荐给程序员好友。
内容备注
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 gblab@vip.qq.com 举报,一经查实,本站将立刻删除。
内容手机端
扫描二维码推送至手机访问。