如何检查是否名单是有序? [英] How to check if a list is ordered?
问题描述
我做的一些单元测试,我想知道是否有任何的方式来测试,如果名单是由它包含的对象的属性进行排序。
现在我做这种方式,但我不喜欢,我希望有一个更好的办法。有人可以帮我吗?
//(填充列表)
清单< StudyFeedItem> studyFeeds =
Feeds.GetStudyFeeds(2120,DateTime.Today.AddDays(-200),20);StudyFeedItem previous = studyFeeds.First();的foreach(在studyFeeds StudyFeedItem项)
{
如果(项目!= previous)
{
Assert.IsTrue(previous.Date> item.Date);
} previous =项目;
}
如果你正在使用MSTest的,你可能想看看<一个href=\"http://msdn.microsoft.com/en-us/library/microsoft.visualstudio.testtools.unittesting.collectionassert.areequal.aspx\">CollectionAssert.AreEqual.
Enumerable.SequenceEqual 的可能只有一个断言使用其他有用的API。对>
在这两种情况下,你应该prepare保存在预期的顺序预期列表中的列表,然后该列表进行比较的结果。
下面是一个例子:
VAR studyFeeds = Feeds.GetStudyFeeds(2120,DateTime.Today.AddDays(-200),20);
VAR expectedList = studyFeeds.OrderByDescending(X =&GT; x.Date);
Assert.IsTrue(expectedList.SequenceEqual(studyFeeds));
I am doing some unit tests and I want to know if there's any way to test if a list is ordered by a property of the objects it contains.
Right now I am doing it this way but I don't like it, I want a better way. Can somebody help me please?
// (fill the list)
List<StudyFeedItem> studyFeeds =
Feeds.GetStudyFeeds(2120, DateTime.Today.AddDays(-200), 20);
StudyFeedItem previous = studyFeeds.First();
foreach (StudyFeedItem item in studyFeeds)
{
if (item != previous)
{
Assert.IsTrue(previous.Date > item.Date);
}
previous = item;
}
If you are using MSTest, you may want to take a look at CollectionAssert.AreEqual.
Enumerable.SequenceEqual may be another useful API to use in an assertion.
In both cases you should prepare a list that holds the expected list in the expected order, and then compare that list to the result.
Here's an example:
var studyFeeds = Feeds.GetStudyFeeds(2120, DateTime.Today.AddDays(-200), 20);
var expectedList = studyFeeds.OrderByDescending(x => x.Date);
Assert.IsTrue(expectedList.SequenceEqual(studyFeeds));
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