C＃单元测试断言日期时间

Question

我有一个单元测试TimeSpan，我不知道我是否做得对。

测试用例：

/// <summary> 
    /// Wrapper around TimeSpan.TryParse that avoids out parameters. 
    /// Tries to parse a string as a TimeSpan and returns the parsed value as a TimeSpan or null if parsing failed. 
    /// </summary> 
    /// <param name="toParse">A string containing a value to convert</param> 
    /// <param name="formatProvider">An object that provides culture-specific formatting information</param> 
    /// <returns>The value parsed as a TimeSpan or null if parsing failed</returns> 
     public static TimeSpan? ParseTimeSpan(this string toParse, IFormatProvider formatProvider) 
    { 
     TimeSpan value; 
     if (TimeSpan.TryParse(toParse, formatProvider, out value)) 
     { 
      return value; 
     } 
     return null; 
    } 

单位测试：

 [TestMethod()] 
    public void ParseTimeSpanTest() 
    { 
     Assert.AreEqual(ParseTime("5:33 pm"), "5:33".ParseTimeSpan(CultureInfo.InvariantCulture)); 
     Assert.AreEqual(ParseTime("9:22 AM"), "9:22 AM".ParseTimeSpan(CultureInfo.InvariantCulture)); 
     Assert.AreEqual(ParseTime("8:22 pm"), "8:22 pm".ParseTimeSpan(CultureInfo.InvariantCulture)); 
     Assert.AreEqual(ParseTime("7:22:44 AM"), "7:22:44 AM".ParseTimeSpan(CultureInfo.InvariantCulture)); 
     Assert.AreEqual(ParseTime("9:22:44 pm"), "9:22:44 pm".ParseTimeSpan(CultureInfo.InvariantCulture)); 
     Assert.AreEqual(ParseTime("13:22:14"), "13:22:14".ParseTimeSpan(CultureInfo.InvariantCulture)); 
     Assert.AreEqual(ParseTime("23:59:00"), "23:59:00".ParseTimeSpan(CultureInfo.InvariantCulture)); 

     Assert.AreEqual(null, "25:59:00".ParseTimeSpan(CultureInfo.InvariantCulture)); 
     Assert.AreEqual(null, "23:70:00 ".ParseTimeSpan(CultureInfo.InvariantCulture)); 
     Assert.AreEqual(null, "23:59:75".ParseTimeSpan(CultureInfo.InvariantCulture)); 
     Assert.AreEqual(null, "five thirty".ParseTimeSpan(CultureInfo.InvariantCulture)); 


    } 




    private static DateTime ParseTime(string time) 
    { 
     return DateTime.Parse(time, System.Globalization.CultureInfo.InvariantCulture); 
    } 

Answer 1

有可能是类型DateTime和时间跨度之间的误解。 DateTime是代表时间点的数据类型，例如， 1776年7月4日下午12点。 TimeSpan旨在表示经过的时间/持续时间，即比赛持续12小时36分钟。

您可以取两个DateTime的差异来产生TimeSpan。试图将时间解析为时间跨度是很难做到的。例如，如何将9:30 AM转换为TimeSpan？

如果您正在寻找如何测试TimeSpan，或许下面的内容会有所帮助。

public static TimeSpan? ParseTimeSpan(this string toParse, IFormatProvider formatProvider) 
    { 
     TimeSpan value; 
     if (TimeSpan.TryParse(toParse, formatProvider, out value)) 
     { 
      return value; 
     } 
     return null; 
    } 

[TestMethod()] 
public void ParseTimeSpanTest() 
{ 
    Assert.AreEqual(ParseTime("5:33"), "5:33".ParseTimeSpan(CultureInfo.InvariantCulture)); 
    Assert.AreEqual(ParseTime("9:22"), "9:22".ParseTimeSpan(CultureInfo.InvariantCulture)); 
    Assert.AreEqual(ParseTime("8:22"), "8:22".ParseTimeSpan(CultureInfo.InvariantCulture)); 
    Assert.AreEqual(ParseTime("7:22:44"), "7:22:44".ParseTimeSpan(CultureInfo.InvariantCulture)); 
    Assert.AreEqual(ParseTime("9:22:44"), "9:22:44".ParseTimeSpan(CultureInfo.InvariantCulture)); 
    Assert.AreEqual(ParseTime("13:22:14"), "13:22:14".ParseTimeSpan(CultureInfo.InvariantCulture)); 
    Assert.AreEqual(ParseTime("23:59:00"), "23:59:00".ParseTimeSpan(CultureInfo.InvariantCulture)); 

    Assert.AreEqual(null, "22:59:00 AM".ParseTimeSpan(CultureInfo.InvariantCulture)); 
    Assert.AreEqual(null, "23:70:00 PM".ParseTimeSpan(CultureInfo.InvariantCulture)); 
    Assert.AreEqual(null, "23:59:75 AM".ParseTimeSpan(CultureInfo.InvariantCulture)); 
    Assert.AreEqual(null, "five thirty PM".ParseTimeSpan(CultureInfo.InvariantCulture)); 

    var dt = DateTime.Now; 
    Assert.AreEqual(dt.AddHours(1) - dt, "1:00".ParseTimeSpan(CultureInfo.InvariantCulture)); 
} 

private static TimeSpan ParseTime(string time) 
{ 
    return TimeSpan.Parse(time, CultureInfo.InvariantCulture); 
}