xUnit Theory test ClassData with complex type

xUnit.net is a powerful, free, open source, unit testing tool for the .NET Framework. xUnit uses different notation to NUnit or MSUnit to specify test with parameters. Here I am going to show how to use Theory ClassData with complex type.

I have a sample class Plant, which has function 'bool IsEqual(Plant plant);'. We will create a Theory test for it.

[Theory]
[ClassData(typeof(IsEqualTestData))]
public void IsEqual(Plant plant1, Plant plant2, bool expectedResult)
{
   Assert.Equal(expectedResult, plant1.IsEqual(plant2));
}

Class IsEqualTestData is a ClassData used with complex type Plant. It generates a list of arrays of 3 objects Plant1, Plant2, and ExpectedResult boolean.

private class IsEqualTestData : IEnumerable<object[]>
{
    private readonly List<object[]> _data = new List<object[]>
    {
        new object[] 
        {
            new Plant() 
            { 
                Name = PlantTester.PlantName1, 
                Description = PlantTester.PlantDescription1 
            },
            new Plant() 
            { 
                Name = PlantTester.PlantName2, 
                Description = PlantTester.PlantDescription2 
            }, 
            false
        },
        new object[] 
        {
            new Plant() { Name = PlantTester.PlantName1 },
            new Plant() { Name = PlantTester.PlantName1 },
            true
        },
        new object[] 
        {
            new Plant() 
            { 
                Name = PlantTester.PlantName1, 
                Description = PlantTester.PlantDescription1 
            },
            new Plant() 
            { 
                Name = PlantTester.PlantName2, 
                Description = PlantTester.PlantDescription1 
            }, 
            true
        }
    };

    public IEnumerator<object[]> GetEnumerator()
    {
        return _data.GetEnumerator();
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
}

When running in xUnit it will report result of running each entry in the test.

If you are using Visual Studio you can download snippet file from github repository.

Reference:

xUnit_ClassData.snippet
Using dotnet watch test for continuous testing with .NET Core and XUnit.net - Scott Hanselman