使用Fluent断言,我们可以使用以下内容断言两个集合相等(就属性值而言):
list1.ShouldBeEquivalentTo(list2);
假设list1
和list2
包含相同的对象in any order
,则断言将为真。
如果我们想断言列表的顺序是正确的,我们可以这样做:
list1.ShouldBeEquivalentTo(list2, o => o.WithStrictOrdering());
如果列表在wrong order
中包含相同的对象,但我找不到任何对象,我正在寻找断言false的东西。
使用Fluent断言的最佳方式是什么?
PS-这是一种学术好奇心,在现实中可能没有那么有用:)
EDIT:现在我了解了davy的要求(请参阅下面的注释),我更新了代码以使用此解决方案。尽管语法相似,但它不是FluentAssession的扩展,但经过一些操作,它可能是。
public static class IEnumerableAssertionExtensions
{
public static void ShouldContainInWrongOrder<TSubject>(this IEnumerable<TSubject> source, IEnumerable<TSubject> expected)
{
var remaining = expected.ToList();
var inOrder = true;
foreach (var subject in source)
{
if (inOrder && !ReferenceEquals(subject, remaining[0]))
{
inOrder = false;
}
var s = subject;
Execute.Verification.ForCondition(() => remaining.Remove(s)).FailWith("Expected item in the collection: {0}", subject.ToString());
}
Execute.Verification.ForCondition(() => remaining.Count == 0).FailWith(string.Format("{0} more item{1} than expected found in the list.", remaining.Count, ((remaining.Count == 1) ? string.Empty : "s")));
Execute.Verification.ForCondition(() => !inOrder).FailWith("list items are ordered identically");
}
}
[TestClass]
public class TestFoo
{
class Thing
{
public int i;
}
[TestMethod]
public void MyMethod()
{
var a1 = new Thing { i=0 };
var a2 = new Thing { i=1 };
var a3 = new Thing { i=2 };
var a4 = new Thing { i=2 };
var list1 = new List<Thing> { a1, a2, a3 };
var list2 = new List<Thing> { a1, a2, a3 };
var list3 = new List<Thing> { a3, a2, a1 };
var list4 = new List<Thing> { a1, a2, a3, a4 };
var list5 = new List<Thing> { a3, a2 };
list1.ShouldContainInWrongOrder(list3); // Succeeds
list1.ShouldContainInWrongOrder(list2); // Fails
list1.ShouldContainInWrongOrder(list4); // Fails
list1.ShouldContainInWrongOrder(list5); // Fails
}
}