How Can I Pass Complex Parameters to xUnit Theory Tests?

Passing Complex Parameters to [Theory]

In Xunit, the InlineData attribute enables you to create individual tests for each set of data provided. However, what if your method takes a complex parameter, such as a list of custom objects?

To handle this situation, XUnit offers the MemberData attribute. By defining a property that returns IEnumerable, you can generate an array of objects that will be unpacked and passed as individual parameters to your Theory method. Here's an example:

MemberData Example:

public class StringTests2
{
    [Theory, MemberData(nameof(SplitCountData))]
    public void SplitCount(string input, int expectedCount)
    {
        var actualCount = input.Split(' ').Count();
        Assert.Equal(expectedCount, actualCount);
    }

    public static IEnumerable<object[]> SplitCountData =>
        new List<object[]>
        {
            new object[] { "xUnit", 1 },
            new object[] { "is fun", 2 },
            new object[] { "to test with", 3 }
        };
}

In XUnit version 2.0 or later, you can use the [MemberData] attribute on a method that returns IEnumerable. The following example demonstrates this:

Overloaded MemberData Example:

public class StringTests3
{
    [Theory, MemberData(nameof(IndexOfData.SplitCountData), MemberType = typeof(IndexOfData))]
    public void IndexOf(string input, char letter, int expected)
    {
        var actual = input.IndexOf(letter);
        Assert.Equal(expected, actual);
    }
}

public class IndexOfData  
{
    public static IEnumerable<object[]> SplitCountData => 
        new List<object[]>
        {
            new object[] { "hello world", 'w', 6 },
            new object[] { "goodnight moon", 'w', -1 }
        };
}

By utilizing these techniques, you can effectively pass complex parameters to your Theory tests.

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