I am trying to extend MbUnit with a new test attribute
[ExpectedCOMException(int)]. You can probably guess what it does.
Inside the class, I throw exceptions such as
ExceptionTypeMismatchException (similar to how ExpectedException does
it). The problem is that when I throw these exceptions, they are not
handled by anyone and therefore cause an unhandled exception message
dialog to appear. I am confused because I though MbUnit would be
catching these somewhere and failing the test (which is what I want).
My question is, where does MbUnit catch exceptions thrown in test
methods? How can I solve this problem?
my code:
namespace MbUnit.Framework
{
[AttributeUsage(AttributeTargets.Method, AllowMultiple = true,
Inherited = true)]
public sealed class ExpectedCOMExceptionAttribute :
DecoratorPatternAttribute
{
private int m_nErrorCode;
public ExpectedCOMExceptionAttribute(int errorCode)
{
m_nErrorCode = errorCode;
}
public int M_nErrorCode
{
get
{
return this.m_nErrorCode;
}
}
public override IRunInvoker GetInvoker(IRunInvoker invoker)
{
return new ExpectedCOMExceptionRunInvoker(invoker, this);
}
private sealed class ExpectedCOMExceptionRunInvoker :
DecoratorRunInvoker
{
private ExpectedCOMExceptionAttribute attribute;
public ExpectedCOMExceptionRunInvoker
(
IRunInvoker invoker,
ExpectedCOMExceptionAttribute attribute)
: base(invoker)
{
this.attribute = attribute;
}
public override object Execute(object o, IList args)
{
//invoke tagged method
try
{
this.Invoker.Execute(o, args);
}
catch (Exception ex)
{
Exception catchedException = ex;
if (catchedException is TargetInvocationException)
catchedException = ex.InnerException;
if (!
typeof(System.Runtime.InteropServices.COMException).IsInstanceOfType(catchedException))
throw new
MbUnit.Core.Exceptions.ExceptionTypeMistmachException(typeof(System.Runtime.InteropServices.COMException),
"Description not implemented",
catchedException);
else
{
System.Runtime.InteropServices.COMException
current =
(System.Runtime.InteropServices.COMException)catchedException;
if (current.ErrorCode !=
attribute.M_nErrorCode)
throw new Exception("wrong error code");
else return null;
}
}
throw new
ExceptionNotThrownException(typeof(System.Runtime.InteropServices.COMException),
"Description not implemented");
}
}
}
}
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