v2 v3   Warning

xUnit1053

"The static member used as theory data must be statically initialized"

Cause

A violation of this rule occurs when a member referenced by [MemberData] is not statically initialized.

Reason for rule

Data provided by a member data source must be statically initialized so that it can be used to provide data for the tests that reference it with [MemberData]. Failing to initialize the data source will result in no data rows.

How to fix violations

To fix a violation of this rule, either initialize the value inline or via a static constructor.

Examples

Violates

using Xunit;

public class xUnit1053
{
    public static TheoryData<int> DataSource;

    [Theory]
    [MemberData(nameof(DataSource))]
    public void TestMethod(int x) =>
        Assert.NotEqual(0, x);
}

Does not violate

using Xunit;

public class xUnit1053
{
    public static TheoryData<int> DataSource = [4, 9, 16];

    [Theory]
    [MemberData(nameof(DataSource))]
    public void TestMethod(int x) =>
        Assert.NotEqual(0, x);
}

using Xunit;

public class xUnit1053
{
    public static TheoryData<int> DataSource;

    static xUnit1053() =>
        DataSource = [4, 9, 16];

    [Theory]
    [MemberData(nameof(DataSource))]
    public void TestMethod(int x) =>
        Assert.NotEqual(0, x);
}