assertEquals() Asserts that two objects are equal. assertSame() Asserts that two objects refer to the same object. the assertEquals should pass and assertSame should fail, as the value of both classes are equal but they have different reference location.
JUnit 5 Tutorial assertNotEquals() method with examples. The assertNotEquals() method asserts that two objects are not equals. If they are, an AssertionError without a message is thrown. If unexpected and actual are null, they are considered equal.
The old method (of JUnit 3) was to mark the test-classes by extending junit.framework.TestCase
. That inherited junit.framework.Assert
itself and your test class gained the ability to call the assert methods this way.
Since version 4 of JUnit, the framework uses Annotations
for marking tests. So you no longer need to extend TestCase
. But that means, the assert methods aren't available. But you can make a static import of the new Assert
class. That's why all the assert methods in the new class are static methods. So you can import it this way:
import static org.junit.Assert.*;
After this static import, you can use this methods without prefix.
At the redesign they also moved to the new package org.junit
that follows better the normal conventions for package naming.
JUnit 3.X: junit.framework.Assert
JUnit 4.X: org.junit.Assert
Prefer the newest one, especially when running JDK5 and higher with annotation support.
There is in fact a functional change: org.junit.Assert
will complain if you use the two-argument assertEquals()
with float
or double
, while junit.framework.Assert
will silently autobox it.
I believe they are refactoring from junit.framework
to org.junit
and junit.framework.Assert
is maintained for backwards compatibility.
I did a rough source code compare and there are no serious changes. A lot of comments were added in org.junit.Assert
and some refactorings are done. The only change is the comparison with Arrays
. There are some code cleanups, but there's (imho) no functional change.
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