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public static class MyCollectionAssertionExtensions
{
public static AndConstraint<StringCollectionAssertions> ContainMagic(this StringCollectionAssertions assertions)
{
Execute.Assertion
.ForCondition(assertions.Subject.As<MyType>().ContainsMagicString())
.FailWith("No, there's no magic");
return new AndConstraint<StringCollectionAssertions>(assertions);
}