NUnit1031

The individual arguments provided by a ValuesAttribute must match the type of the corresponding parameter of the method

Topic	Value
Id	NUnit1031
Severity	Error
Enabled	True
Category	Structure
Code	ValuesUsageAnalyzer

Description

The individual arguments provided by a ValuesAttribute must match the type of the corresponding parameter of the method.

Motivation

To prevent tests that will fail at runtime due to improper construction.

How to fix violations

Example Violation

[Test]
public void SampleTest([Values(0.0, 1.0)] int numberValue)
{
    Assert.That(numberValue, Is.AnyOf(0, 1));
}

Problem

In the test above, numberValue is declared as an integer. However, [Values(0.0, 1.0)] provides values as doubles. This will lead to a runtime failure.

Fix

Ensure that the type of the objects used by the ValuesAttribute matches that of the parameter.

So, this fix would be acceptable:

// Both use type int.
[Test]
public void SampleTest([Values(0, 1)] int numberValue)
{
    Assert.That(numberValue, Is.AnyOf(0, 1));
}

And this would also work:

// Both use type double
[Test]
public void SampleTest([Values(0.0, 1.0)] double numberValue)
{
    Assert.That(numberValue, Is.AnyOf(0, 1));
}

Configure severity

Via ruleset file

Configure the severity per project, for more info see MSDN.

Via .editorconfig file

# NUnit1031: The individual arguments provided by a ValuesAttribute must match the type of the corresponding parameter of the method
dotnet_diagnostic.NUnit1031.severity = chosenSeverity

where chosenSeverity can be one of none, silent, suggestion, warning, or error.

Via #pragma directive

#pragma warning disable NUnit1031 // The individual arguments provided by a ValuesAttribute must match the type of the corresponding parameter of the method
Code violating the rule here
#pragma warning restore NUnit1031 // The individual arguments provided by a ValuesAttribute must match the type of the corresponding parameter of the method

Or put this at the top of the file to disable all instances.

#pragma warning disable NUnit1031 // The individual arguments provided by a ValuesAttribute must match the type of the corresponding parameter of the method

Via attribute [SuppressMessage]

[System.Diagnostics.CodeAnalysis.SuppressMessage("Structure",
    "NUnit1031:The individual arguments provided by a ValuesAttribute must match the type of the corresponding parameter of the method",
    Justification = "Reason...")]