I am new to java, for curiosity I am asking, can I mock methods of another classes by using mockito, or only the classes I can mock. thanks in advance
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I'm very novice to Unit Testing, I have created a Spring Boot Application and now I want to do some testing what's confusing me is where to use what e.g. I have classes and interfaces Controllers, Service, Repository I know each will have it's own Test class, so what will I be using let's say in Controllers, JUnit or Mockito ? similar question for Service and Repository.
conclusion: JUnit and Mockito can be used at same time, JUnit is used to do common test, and Mockito is used to mock objects.
In my view, JUnit is used more often, and Mockito is only used when I want to mock object, such as the object which is not finished yet. If you just want to test your Controller, Service and Repository, I recommend you to use JUnit. But if you need to mock some objects, you can use Mockito.
For example, when you test ServiceA, which depends on ServiceB, and ServiceB is not finished yet, you can use Mockito to mock ServiceB just to satisfy your requirements to test ServiceA
Hope this answer helps you! you can go to mockito and JUnit5 to learn more about them.
I've been trying to understand how Mockito mocking works. I've read various responses and there seems to be a conflicting argument whether Mockito uses reflection internally or not.
Here, it clearly says that mockito does not use Reflection:
https://stackoverflow.com/questions/15970810/using-mockito-to-mock-methods-by-reflection#:~:text=Mockito%20is%20a%20really%20well,easy%20to%20read%20and%20understand.
On the other hand, the most popular tutorial website says otherwise in the very first line under Mockito:
https://www.tutorialspoint.com/mockito/mockito_overview.htm
I'm slightly confused with what's true about mocking with Mockito.
Mockito uses the reflection internally. You can check it out this source code also on Mockito Git Library.
I'm writing some tests with JUnit and Mockito.
I've noticed that Mockito provides a JUnit Runner and a JUnit TestRule
Which are the pros and cons of each solution ?
In general, a rule provides more flexibility than a runner. There can be only one runner, whereas you can have multiple rules in one test class.
Since Mockitos runner and rule apparently do the same I don't see a reason to use the runner here.
For the sake of completeness, I'd like to mention that there is no need to use Mockito's rules (or runners) unless you want to use mock annotations or validateMockitoUsage().
For consistency I usually create all mocks with mock() as quite often tests have mocked fields as well as mocked local variables.
Are there any libraries for the JVM that allow mocking of static methods WITHOUT needing annotations? I am attempting to build this feature into a Clojure testing framework (Midje). Clojure has very poor, or non-existant annotation support.
Use powermock.It's a great library for mocking. And here is an example that explains how to mock static methods.
Would anyone suggest a Mock library and provide the reasoning behind the pick?
I am looking to introduce one to the existing code base.
Thanks.
This is the best comparison I've seen, of multiple Java mocking frameworks, including EasyMock and mockito. [The original page is offline; this link is to an archived copy.]
It includes EasyMock, Mockito, jMock, SevenMock, JMockit, rMock, Unitils.
I used EasyMock first, but have moved to Mockito. Unit tests created with EasyMock were sometimes fragile and hard to debug. Mockito is easy, partly because it distinguishes between stubbing and verification. Here's a Mockito-oriented comparison of it and EasyMock: http://code.google.com/p/mockito/wiki/MockitoVSEasyMock.
My suggestion is JMockit (I wrote it). The project site has a lot of information (and hundreds of actual JUnit tests) comparing several Java mocking APIs (EasyMock, jMock, JMockit, Mockito, PowerMock, Unitils Mock), as well as an extensive feature comparison matrix.
easymock. Reasons, from their site
'EasyMock provides Mock Objects for interfaces (and objects through the class extension) by generating them on the fly using Java's proxy mechanism. Due to EasyMock's unique style of recording expectations, most refactorings will not affect the Mock Objects. So EasyMock is a perfect fit for Test-Driven Development.'
Here is another comparison: http://softwareinabottle.wordpress.com/2010/09/12/finding-the-mock-framework-that-best-suits-me-part-1-the-contenders/
http://softwareinabottle.wordpress.com/2010/10/06/comparing-java-mock-frameworks-part-2-creating-mock-objects/