NUnit2023

NUnit2023

Invalid NullConstraint usage.

Topic	Value
Id	NUnit2023
Severity	Warning
Enabled	True
Category	Assertion
Code	NullConstraintUsageAnalyzer

Description

NullConstraint is allowed only for reference types or nullable value types.

Motivation

Non-nullable value types cannot have null value, therefore Is.Null assertions will always fail (or will always pass for Is.Not.Null).

How to fix violations

Use suitable constraint.

Configure severity

Via ruleset file.

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

Via #pragma directive.

#pragma warning disable NUnit2023 // Invalid NullConstraint usage.
Code violating the rule here
#pragma warning restore NUnit2023 // Invalid NullConstraint usage.

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

#pragma warning disable NUnit2023 // Invalid NullConstraint usage.

Via attribute [SuppressMessage].

[System.Diagnostics.CodeAnalysis.SuppressMessage("Assertion", 
    "NUnit2023:Invalid NullConstraint usage.",
    Justification = "Reason...")]