我希望将Fluent Assertion的集合断言和属性断言“结合”起来,例如使用按属性(可能是“嵌套”)比较(即功能语言术语中的结构相等)来断言两个IEnumerable是否成对相等。
具体示例:
在这里,我编写了一个扩展方法
具体示例:
var dic = new Dictionary<int, string>() { {1, "hi"}, {2, "bye" } };
var actual = dic.ToSelectListItems(0).OrderBy(si => si.Text);
var expected = new List<SelectListItem>() {
new SelectListItem() {Selected = false, Text="bye", Value="2"},
new SelectListItem() {Selected = false, Text="hi", Value="1"}
};
在这里,我编写了一个扩展方法
ToSelectListItems
,将Dictionary
转换为IEnumerable
中的SelectListItem
(来自ASP.NET MVC)。 我想断言actual
和expected
在结构上相等,注意引用类型SelectListItem
没有覆盖Equal
,因此默认情况下使用引用相等性。
更新
目前使用以下手动解决方案,仍希望有更好的内置于FluentAssertions中:
public static void ShouldBeStructurallyEqualTo<T, U>(this IEnumerable<T> actual, IEnumerable<U> expected) {
actual.Should().HaveCount(expected.Count());
actual.Zip(expected).ForEach(pair => pair.Item1.ShouldHave().AllProperties().IncludingNestedObjects().EqualTo(pair.Item2));
}
(注:这里的 Zip
是我自己编写的IEnumerable
扩展,它使用Tuple.Create
作为默认投影)
更新2
这里有两个最小的示例:
public class FooBar {
public string Foo { get; set; }
public int Bar { get; set; }
}
public class TestClass {
[Test]
public void MinimalExample() {
List<FooBar> enumerable1 = new List<FooBar>() { new FooBar() { Foo = "x", Bar = 1 }, new FooBar() { Foo = "y", Bar = 2 } };
List<FooBar> enumerable2 = new List<FooBar>() { new FooBar() { Foo = "x", Bar = 1 }, new FooBar() { Foo = "y", Bar = 2 } };
enumerable1.ShouldHave().SharedProperties().IncludingNestedObjects().EqualTo(enumerable2);
//Test 'TestClass.MinimalExample' failed: System.Reflection.TargetParameterCountException : Parameter count mismatch.
// at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
// at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
// at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
// at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, Object[] index)
// at FluentAssertions.Assertions.PropertyEqualityValidator.AssertSelectedPropertiesAreEqual(Object subject, Object expected)
// at FluentAssertions.Assertions.PropertyEqualityValidator.Validate(UniqueObjectTracker tracker, String parentPropertyName)
// at FluentAssertions.Assertions.PropertyEqualityValidator.Validate()
// at FluentAssertions.Assertions.PropertyAssertions`1.EqualTo(Object otherObject, String reason, Object[] reasonArgs)
// at FluentAssertions.Assertions.PropertyAssertions`1.EqualTo(Object otherObject)
// MiscAssertions.cs(32,0): at TestClass.MinimalExample()
}
[Test]
public void MinimalExample2() {
IEnumerable<FooBar> enumerable1 = (new List<FooBar>() { new FooBar() { Foo = "x", Bar = 1 }, new FooBar() { Foo = "y", Bar = 2 } }).Cast<FooBar>();
FooBar[] enumerable2 = new [] { new FooBar() { Foo = "x", Bar = 1 }, new FooBar() { Foo = "y", Bar = 2 } };
enumerable1.ShouldHave().SharedProperties().IncludingNestedObjects().EqualTo(enumerable2);
//Test 'TestClass.MinimalExample2' failed: System.InvalidOperationException : Please specify some properties to include in the comparison.
// at FluentAssertions.Assertions.PropertyEqualityValidator.Validate(UniqueObjectTracker tracker, String parentPropertyName)
// at FluentAssertions.Assertions.PropertyEqualityValidator.Validate()
// at FluentAssertions.Assertions.PropertyAssertions`1.EqualTo(Object otherObject, String reason, Object[] reasonArgs)
// at FluentAssertions.Assertions.PropertyAssertions`1.EqualTo(Object otherObject)
// MiscAssertions.cs(52,0): at TestClass.MinimalExample2()
}
}
dto
和customer
都是IEnumerable<'T>
的子类,因此它们没有任何共享属性(它们包含的元素有,但不是IEnumerable本身)。因此,我得到了System.InvalidOperationException:请指定要包括在比较中的一些属性。 at FluentAssertions.Assertions.PropertyEqualityValidator.Validate(UniqueObjectTracker tracker, String parentPropertyName)
。 - Stephen Swensenactual
和expected
都表示可枚举的集合,其中的对象并不完全相同,但具有相同的属性吗? - Dennis Doomenvar
等)! - Stephen Swensen