The member referenced by the MemberData attribute returns untyped data rows
xUnit.net offers a strongly-typed TheoryData<> class which can be used instead of IEnumerable<object[]>
when returning member data. For v3 projects, you can also use IEnumerable<TheoryDataRow<>> and
IAsyncEnumerable<TheoryDataRow<>>, as well as supporting Task<> or ValueTask<> around the
entire data set.
Using TheoryData<> or TheoryDataRow<> provides a type-safe way to provide member data for
theories. The compiler can indicate when you have provided incompatible data, and several other analyzers
will help ensure your TheoryData<> or TheoryDataRow<> type usage matches your test method parameters.
To fix a violation of this rule in v2, replace IEnumerable<object[]> with TheoryData<>.
To fix a violation of this rule in v3, replace IEnumerable<object[]>, IEnumerable<ITheoryDataRow>, or IEnumerable<TheoryDataRow> with either TheoryData<> or IEnumerable<TheoryDataRow<>>. You may also use IAsyncEnumerable<>, and you may wrap the return value in either Task<> or ValueTask<>.
using System.Collections.Generic;
using Xunit;
public class xUnit1042
{
public static IEnumerable<object[]> TestData = new[] { new object[] { 42 }, new object[] { 2112 } };
[Theory]
[MemberData(nameof(TestData))]
public static void TestMethod(int _)
{ }
}
using System.Collections.Generic;
using Xunit;
public class xUnit1042
{
public static IEnumerable<TheoryDataRow> TestData = [new(42), new(2112)];
[Theory]
[MemberData(nameof(TestData))]
public static void TestMethod(int _)
{ }
}
using Xunit;
public class xUnit1042
{
public static TheoryData<int> TestData = new() { 42, 2112 };
[Theory]
[MemberData(nameof(TestData))]
public static void TestMethod(int _)
{ }
}
using System.Collections.Generic;
using Xunit;
public class xUnit1042
{
public static IEnumerable<TheoryDataRow<int>> TestData = [new(42), new(2112)];
[Theory]
[MemberData(nameof(TestData))]
public static void TestMethod(int _)
{ }
}