Learn XUnit collection assertion methods including Assert.Contains, Assert.DoesNotContain, Assert.All, Assert.Empty, Assert.NotEmpty, Assert.Single, Assert.Distinct, and Assert.Collection for testing lists, arrays, and IEnumerable in C# unit tests. This XUnit tutorial explains how to test collection values, verify items exist in collections, check if collections are empty, validate all elements meet conditions, ensure collection uniqueness with Assert.Distinct, test single-item collections, and validate collection elements in order with Assert.Collection in ASP.NET Core applications. Master XUnit collection testing for .NET developers with practical examples of testing List of arrays, IEnumerable, and best practices for collection assertions in your C# unit tests.
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