Oren Eini

aka Ayende Rahien

Oren Eini

CEO of RavenDB

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Jul 01 2008

Bug of the day...

time to read 1 min | 13 words

Using MbUnit 2.4, this test pass:

Guid g = Guid.Empty;
Assert.AreEqual(Guid.Empty, g);
Assert.AreNotEqual(Guid.Empty, g);

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Comments

01 Jul 2008
21:02 PM

josh

well that's helpful

01 Jul 2008
22:00 PM

Oran

Yep, ran into that one a while ago...

http://code.google.com/p/mb-unit/issues/detail?id=114

01 Jul 2008
22:01 PM

Andrey Shchekin

It's funny that I have stumbled in the exactly same bug today.

Well, seems almost no one is actually using AreNotEqual if this lived to the 2.4.

01 Jul 2008
22:02 PM

Andy Stopford

Thanks Oren, I'll need to investigate this more but I think in the absence of an assert for Guid that MbUnit is casting to object and then equating as a null. The AreNotEqual has this gem.

if (expected == null ^ actual == null)

return;

As both become null in the cast it passes. Thats a complete guess at the moment until I can investigate more. Always fun.

Andy

02 Jul 2008
00:46 AM

James Curran

Maybe it been updated since the version I'm running (1.0.2700) but the real problem I see is that AreEqual(object, object) uses the object's Equals() methods (via ObjectsEqual) which is customized to the class, while AreNotEqual just uses !(obj==obj) which ultimately just Object.ReferenceEquals.

02 Jul 2008
09:19 AM

Stefan Wenig

That's because GUIDs are so unique that even two identical GUIDs are not quite equal. Duh.

02 Jul 2008
14:28 PM

arielr

That's nothing compared to my bug of the day:

try running this piece of code in the immediate window and then in the body of a funcion.

bool a = object.ReferenceEquals("A","A")

03 Jul 2008
10:37 AM

AndyKernahan

That's nothing compared to my bug of the day:

try running this piece of code in the immediate window and then in the body of a funcion.

bool a = object.ReferenceEquals("A","A")

a would be true as the compiler would have inturned the string "A"

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