<PackageReference Include="NUnit" Version="4.3.2" />

TrueConstraint

public class TrueConstraint : Constraint
TrueConstraint tests that the actual value is true
using System; using System.Runtime.CompilerServices; namespace NUnit.Framework.Constraints { [NullableContext(1)] [Nullable(0)] public class TrueConstraint : Constraint { public override string Description => "True"; public override ConstraintResult ApplyTo<[Nullable(2)] TActual>(TActual actual) { return new ConstraintResult(this, actual, true.Equals((object)actual)); } public TrueConstraint() : base(Array.Empty<object>()) { } } }