For NUnit 3.0 we should re-address this. Options...

1) Allow multiple ExpectedExceptionAttributes on a method, where any of the 
given exceptions satisfies the test
2) Verify that only one ExpectedException is present and give an error if there 
are more

This may apply to other attributes as well.

** Also affects: nunit-3.0
   Importance: Undecided
       Status: New

** Tags added: feature framework

-- 
ExpectedException specification
https://bugs.launchpad.net/bugs/532536
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Status in NUnit Test Framework: New
Status in NUnit V2 Test Framework: Won't Fix

Bug description:
I subclassed ExpectedException attribute passing to super constructor 
AssertionException type.

Now if I attibute my test method with both my subclass and 
ExpectedException(AssertionException) I get runner and attribute order 
dependent behaviour: 

  - R# runner interpretes all attributes in sequence so a test method body that 
passes is toggled to failure by the first ExpectedException attribute then the 
failure is toggled back to pass by the next ExpectedException attribute. 

  - Nunit 2.5.3 gui-runner seems to interpret just the first one 

for:

    <Test()> <ObservedBehaviour("Code generator produces duplicates.")> 
<ExpectedException(GetType(AssertionException))> _
    Public Sub ObservedBehaviourAfterChangeTest()

yielding:

     Observed behaviour has been changed. Please balance the value of the 
change with compatibility breach costs.
     Originally observed behaviour: Code generator produces duplicates.
     NUnit.Framework.AssertionException was expected

while for

    <Test()> <ExpectedException(GetType(AssertionException))> 
<ObservedBehaviour("Code generator produces duplicates.")> _
    Public Sub ObservedBehaviourAfterChangeTest()

returning:

    NUnit.Framework.AssertionException was expected

The documentation deserves a clarification.



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