v2 v3   Error

xUnit9015

"There is no matching MemberData method argument"

Cause

A violation of this rule occurs when [MemberData] references a method, and not enough arguments are provided for the

Reason for rule

You must provide arguments for all [MemberData] parameters.

How to fix violations

To fix a violation of this rule, do one of:

• Remove parameters
• Make parameters optional
• Add arguments

Examples

Violates

using Xunit;

public class xUnit9015
{
    public static TheoryData<int> DataSource(int multiplier) => [42 * multiplier];

    [Theory]
    [MemberData(nameof(DataSource))]
    public void TestMethod(int _)
    { }
}

Does not violate

using Xunit;

public class xUnit9015
{
    public static TheoryData<int> DataSource() => [42];

    [Theory]
    [MemberData(nameof(DataSource))]
    public void TestMethod(int _)
    { }
}

using Xunit;

public class xUnit9015
{
    public static TheoryData<int> DataSource(int multiplier = 1) => [42 * multiplier];

    [Theory]
    [MemberData(nameof(DataSource))]
    public void TestMethod(int _)
    { }
}

using Xunit;

public class xUnit9015
{
    public static TheoryData<int> DataSource(int multiplier) => [42 * multiplier];

    [Theory]
    [MemberData(nameof(DataSource), 1)]
    public void TestMethod(int _)
    { }
}