NUnit2025

Wrong actual type used with ContainsConstraint

Topic	Value
Id	NUnit2025
Severity	Error
Enabled	True
Category	Assertion
Code	ContainsConstraintWrongActualTypeAnalyzer

Description

The ContainsConstraint requires the type of the actual value to be either a string or a collection of strings.

Motivation

Using a ContainsConstraint with an actual argument, which is neither a string nor a collection of strings, leads to an assertion error.

How to fix violations

Fix the actual value or use appropriate constraint.

Configure severity

Via ruleset file

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

Via .editorconfig file

# NUnit2025: Wrong actual type used with ContainsConstraint
dotnet_diagnostic.NUnit2025.severity = chosenSeverity

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

Via #pragma directive

#pragma warning disable NUnit2025 // Wrong actual type used with ContainsConstraint
Code violating the rule here
#pragma warning restore NUnit2025 // Wrong actual type used with ContainsConstraint

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

#pragma warning disable NUnit2025 // Wrong actual type used with ContainsConstraint

Via attribute [SuppressMessage]

[System.Diagnostics.CodeAnalysis.SuppressMessage("Assertion",
    "NUnit2025:Wrong actual type used with ContainsConstraint",
    Justification = "Reason...")]