RangeConstraint
RangeConstraint tests whether two values are within a
specified range.
using System;
using System.Collections;
using System.Collections.Generic;
namespace NUnit.Framework.Constraints
{
public class RangeConstraint : Constraint
{
private readonly object from;
private readonly object to;
private ComparisonAdapter comparer = ComparisonAdapter.Default;
public override string Description => $"""{from}""{to}""";
public RangeConstraint(object from, object to)
: base(from, to)
{
this.from = from;
this.to = to;
}
public override ConstraintResult ApplyTo<TActual>(TActual actual)
{
if (from == null || to == null || actual == null)
throw new ArgumentException("Cannot compare using a null reference", "actual");
CompareFromAndTo();
bool isSuccess = comparer.Compare(from, actual) <= 0 && comparer.Compare(to, actual) >= 0;
return new ConstraintResult(this, actual, isSuccess);
}
public RangeConstraint Using(IComparer comparer)
{
this.comparer = ComparisonAdapter.For(comparer);
return this;
}
public RangeConstraint Using<T>(IComparer<T> comparer)
{
this.comparer = ComparisonAdapter.For(comparer);
return this;
}
public RangeConstraint Using<T>(Comparison<T> comparer)
{
this.comparer = ComparisonAdapter.For(comparer);
return this;
}
private void CompareFromAndTo()
{
if (comparer.Compare(from, to) > 0)
throw new ArgumentException("The from value must be less than or equal to the to value.");
}
}
}