StringConstraint
StringConstraint is the abstract base for constraints
that operate on strings. It supports the IgnoreCase
modifier for string operations.
using NUnit.Framework.Internal;
using System;
using System.Runtime.CompilerServices;
namespace NUnit.Framework.Constraints
{
[NullableContext(1)]
[Nullable(0)]
public abstract class StringConstraint : Constraint
{
protected readonly string expected;
protected bool caseInsensitive;
protected string descriptionText = string.Empty;
public override string Description {
get {
string text = descriptionText + " " + MsgUtils.FormatValue(expected);
if (caseInsensitive)
text += ", ignoring case";
return text;
}
}
public virtual StringConstraint IgnoreCase {
get {
caseInsensitive = true;
return this;
}
}
protected StringConstraint()
: base(Array.Empty<object>())
{
expected = string.Empty;
}
protected StringConstraint(string expected)
: base(expected)
{
this.expected = expected;
}
public override ConstraintResult ApplyTo<[Nullable(2)] TActual>(TActual actual)
{
string actual2 = ConstraintUtils.RequireActual<string>(actual, "actual", true);
return new ConstraintResult(this, actual, Matches(actual2));
}
[NullableContext(2)]
protected abstract bool Matches(string actual);
}
}