NUnit2023
Invalid NullConstraint usage
| Topic | Value |
|---|---|
| Id | NUnit2023 |
| Severity | Error |
| 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 .editorconfig file
# NUnit2023: Invalid NullConstraint usage
dotnet_diagnostic.NUnit2023.severity = chosenSeverity
where chosenSeverity can be one of none, silent, suggestion, warning, or error.
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...")]