C# 单元测试断言日期时间

Question

我对

TimeSpan

进行了单元测试，我不知道我做得是否正确。

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;
    }

单元测试：

        [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

DateTime 和 TimeSpan 类型之间可能存在误解。 DateTime 是一种数据类型，用于表示时间点，例如1776 年 7 月 4 日中午 12 点。 TimeSpan 旨在表示经过的时间/持续时间，即比赛持续了 12 小时 36 分钟。

您可以使用两个日期时间的差值来生成时间跨度。尝试将时间解析为时间跨度是很困难的。例如，如何将上午 9:30 转换为时间跨度？

如果您正在寻找如何测试 TimeSpan，也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);
}