/// <summary>
/// Apply a constraint to an actual value, succeedingt if the constraint
/// is satisfied and throwing an assertion exception on failure.
/// </summary>
/// <param name="constraint">An IConstraint to be applied</param>
/// <param name="actual">The actual value to test</param>
/// <param name="message">The message that will be displayed on failure</param>
/// <param name="args">Arguments to be used in formatting the message</param>
public static void That( object actual, IConstraint constraint, string message, params object[] args )
{
Assert.IncrementAssertCount();
if ( !constraint.Matches( actual ) )
{
MessageWriter writer = new TextMessageWriter( message, args );
constraint.WriteMessageTo( writer );
throw new AssertionException( writer.ToString() );
}
}