Re: Fwd: How to test an Exception marked withSerializableAttribute

Simon,
 
In general, it would seem that you are testing too much in one [Test],
but for fairly simple cases like this, I personally would probably
combine them (TDD purists would disagree), because I would probably
write the serialisation and deserialisation routines at the same time.
 
One thing I would do though is compare the deserBaseEx values to the
baseException values, rather than comparing them to hard coded strings
that just happen to be the same in both cases - this makes the intent of
the tests clearer - ie, to show that what you put in is what you got out
again.
 
cheers
 
Tony.
 
 
From: [email protected]
[mailto:[email protected]] On Behalf Of Simon
Garratt
Sent: 31 March 2008 11:55
To: [email protected]
Subject: [Nunit-users] Fwd: How to test an Exception marked
withSerializableAttribute



	Apologies for the earlier, rather lame "Please help me mail".
I'd been up since 3.20am after the darling daughter let go a startled
"Daddy!"  Needless to say, she was back asleep 30 seconds later and I
was still awake come 5.20!  
	 
	Serialization is not an area I'm particularly familiar with.
I've come up with a plan and would appreciate feedback.  I'm looking to
avoid a 'Fragile Test' so please do chip in with any comments.
Basically, I'm serializing a new instance of the exception into a
MemoryStream, resetting the position and then immediately deserializing
it.  Then I perform the Asserts on the deserialized object.
	[

	Test] 

	

	public void BaseException_Serialization() 

	{

	

	BaseException baseException = new BaseException("Test message",
new ArgumentNullException("NullParam")); 

	

	BaseException deserBaseEx; 

	

	BinaryFormatter binaryFormatter = new BinaryFormatter(); 

	

	

	using (MemoryStream memoryStream = new MemoryStream()) 

	{

	binaryFormatter.Serialize(memoryStream, baseException);

	baseException = 

	null; 

	

	memoryStream.Position = 0; 

	deserBaseEx = (

	BaseException)binaryFormatter.Deserialize(memoryStream); 

	}

	

	Assert.That(deserBaseEx.Message, Is.EqualTo("Test message")); 

	

	Assert.That(deserBaseEx.InnerException,
Is.InstanceOfType(typeof(ArgumentNullException))); 

	

	
Assert.That(((ArgumentNullException)deserBaseEx.InnerException).ParamNam
e, Is.EqualTo("NullParam")); 

	

	Assert.That(deserBaseEx.ComputerName,
Is.EqualTo(System.Environment.MachineName)); 

	}



	---------- Forwarded message ----------

	I'm building a base exception class and I want to test it but I
can't think how.  The bit I'm having trouble with is the fourth required
constructor - the serializable one.  What's the best way to serialize
and deserialize it within a test?
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