How Can I Pass Complex Parameters, Like Lists of Custom Classes, to XUnit Theories?

Passing Complex Parameters to Theories

Problem:

XUnit allows creating parameterized tests using InlineData attributes. However, challenges arise when dealing with complex parameters, such as lists of custom classes.

Answer:

XUnit provides various Data attributes, including MemberData. By implementing a property that returns IEnumerable, each item in the collection can be unpacked as a parameter for a single theory method call.

MemberData Example:

public class MyClass { public string Name { get; set; } }

public static void WriteReportsToMemoryStream(
    IEnumerable<MyClass> listReport,
    MemoryStream ms,
    StreamWriter writer) { ... }

[Theory, MemberData(nameof(Data))]
public void WriteReports(IEnumerable<MyClass> listReport)
{
    using (var ms = new MemoryStream())
    {
        using (var writer = new StreamWriter(ms))
        {
            WriteReportsToMemoryStream(listReport, ms, writer);
            // ...
        }
    }
}

public static IEnumerable<object[]> Data => new[]
{
    new object[] { new[] { new MyClass { Name = "Item1" } } },
    new object[] { new[] { new MyClass { Name = "Item2" } } },
};

The Data property generates an enumerable of object arrays, where each array corresponds to a set of parameters for the WriteReports method.

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