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From: Eric Sosman <esosman@comcast-dot-net.invalid>
Newsgroups: comp.lang.java.help
Subject: Re: What is/are the difference(s) between assertSame and assertEquals in JUnit?
Date: Fri, 28 Apr 2017 11:03:34 -0400
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On 4/28/2017 10:04 AM, anvesh.boddupalli@securifi.com wrote:
> I have a similar problem
> 
> Genericindex a;
> Genericindex b;
> 
> a= datafrommethod();//returns object of Genericindex
> b= datafrommethod();//returns object of Genericindex
> 
> b= anothermethod(b);//some object might be overriden
> 
> if(notoverridden){
> assertEquals(a,b);}// this fails
> 
> can someone explain this?

     There's not enough information for a full explanation -- in
particular, we don't know what datafrommethod() does, nor what
anothermethod() does.  However, if the assertEquals() reports a
failure, what we *do* know is

     1) At least one of `a' and `b' is non-null, because if both
were null assertEquals() would not fail.  (It considers two
null references to be "equal.")

     2) If `a' is null then `b' is non-null.  Similarly, if `b'
is null then `a' is non-null.  Either way, `a' and `b' are
unequal: One points to an object, and the other is null.

     3) If both `a' and `b' are non-null, then they point to
two objects that are not equal according to the equals() method.
This might be the equals() method of GenericIndex itself, or of
a subclass of GenericIndex (if `a' or `b' points to a subclass
instance), or an equals() method that GenericIndex inherits
from one of its superclasses (perhaps java.lang.Object).

     ... and that's really all I can discern from what you've
provided.  If I knew more about about datafrommethod(), about
anothermethod(), and about GenericIndex and its sub- and
super-classes, I might be able to explain more fully.

-- 
esosman@comcast-dot-net.invalid
Thirteen hundred sixty-three days to go.