52 lines
1.5 KiB
C#
52 lines
1.5 KiB
C#
// ****************************************************************
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// Copyright 2007, Charlie Poole
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// This is free software licensed under the NUnit license. You may
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// obtain a copy of the license at http://nunit.org/?p=license&r=2.4
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// ****************************************************************
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using System;
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using System.Collections;
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namespace NUnit.Framework.Constraints
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{
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/// <summary>
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/// EmptyConstraint tests a whether a string or collection is empty,
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/// postponing the decision about which test is applied until the
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/// type of the actual argument is known.
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/// </summary>
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public class EmptyConstraint : Constraint
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{
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private Constraint RealConstraint
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{
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get
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{
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if ( actual is string )
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return new EmptyStringConstraint();
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else
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return new EmptyCollectionConstraint();
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}
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}
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/// <summary>
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/// Test whether the constraint is satisfied by a given value
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/// </summary>
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/// <param name="actual">The value to be tested</param>
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/// <returns>True for success, false for failure</returns>
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public override bool Matches(object actual)
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{
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this.actual = actual;
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return this.RealConstraint.Matches( actual );
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}
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/// <summary>
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/// Write the constraint description to a MessageWriter
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/// </summary>
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/// <param name="writer">The writer on which the description is displayed</param>
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public override void WriteDescriptionTo(MessageWriter writer)
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{
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this.RealConstraint.WriteDescriptionTo( writer );
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}
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}
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}
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