1 // ***********************************************************************
2 // Copyright (c) 2008 Charlie Poole
4 // Permission is hereby granted, free of charge, to any person obtaining
5 // a copy of this software and associated documentation files (the
6 // "Software"), to deal in the Software without restriction, including
7 // without limitation the rights to use, copy, modify, merge, publish,
8 // distribute, sublicense, and/or sell copies of the Software, and to
9 // permit persons to whom the Software is furnished to do so, subject to
10 // the following conditions:
12 // The above copyright notice and this permission notice shall be
13 // included in all copies or substantial portions of the Software.
15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 // ***********************************************************************
25 #define NUNIT_FRAMEWORK
31 namespace NUnit.Framework.Constraints
34 /// ThrowsNothingConstraint tests that a delegate does not
35 /// throw an exception.
37 public class ThrowsNothingConstraint : Constraint
39 // TODO: This constraint needs tests
40 private Exception caughtException;
43 /// Gets text describing a constraint
45 public override string Description
47 get { return "No Exception to be thrown"; }
51 /// Test whether the constraint is satisfied by a given value
53 /// <param name="actual">The value to be tested</param>
54 /// <returns>True if no exception is thrown, otherwise false</returns>
55 public override ConstraintResult ApplyTo<TActual>(TActual actual)
57 caughtException = ThrowsConstraint.ExceptionInterceptor.Intercept(actual);
58 return new ConstraintResult(this, caughtException, caughtException == null);
62 /// Applies the constraint to an ActualValueDelegate that returns
63 /// the value to be tested. The default implementation simply evaluates
64 /// the delegate but derived classes may override it to provide for
65 /// delayed processing.
67 /// <param name="del">An ActualValueDelegate</param>
68 /// <returns>A ConstraintResult</returns>
69 public override ConstraintResult ApplyTo<TActual>(ActualValueDelegate<TActual> del)
71 return ApplyTo(new ThrowsConstraint.GenericInvocationDescriptor<TActual>(del));