How to assert a collection is a child of other collection using fluent-assertions?

Question

I want to test a method returning collection using fluent-assertions to ensure that returned collection is a child of other collection, I tried fatherCollection.Should().Contain(childCollection); but not work. How to do that?

Answer 1

You can use collection.Should().ContainEquivalentOf(item) on each of the items in the child collection.