Mockito Junit Interview Question and Answer for fresher and experienced with example | Code Decode

In this video of code decode we have explained mockito interview questions and answers
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What is Mockito in JUnit?
Mockito is a Java-based mocking framework used for unit testing of Java application. Its used in conjunction with other testing frameworks such as JUnit and TestNG. It internally uses Java Reflection API in order to create mock objects for a given interface. Mock objects are nothing but proxy for actual implementations.
What is Mocking?
Mocking in mockito is a process of developing the objects that act as the mock or clone of the real objects. In other words, mocking is a testing technique where mock objects are used instead of real objects for testing purposes. Mock objects provide a specific (dummy) output for a particular (dummy) input passed to it.
Mocking in mockito is used for unit testing is when you create an object that implements the behavior of a real subsystem in controlled ways. In short, mocks are used as a replacement for a dependency.
To mock objects, you need to understand these key concepts of mocking, i.e., stub, fake, spy, dummy and mock. Some of the unit tests involve only stubs, whereas some involve fake, and mocks.
A method invoked using mocked reference does not execute the actual method body defined in the class file, rather the method behavior is configured using when(...).thenReturn(...) methods.
What is @Mock and @InjectMocks?
In mockito-based junit tests, @Mock annotation creates mocks and @InjectMocks creates actual objects and injects mocked dependencies into it.
We must define the when(...).thenReturn(...) methods for mock objects whose class methods will be invoked during actual test execution.
So In a junit test, we create objects for the class which need to be tested and its methods to be invoked using inject mock
We create mocks for the dependencies which will not be present in the test environment and objects are dependent on it to complete the method call.
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[@235gurukeerthana5]

i learned some many things because of your explanation huge fan of you!!!!!. Please create a series for other Junit topics also like spy, fake and dummy etc.. and please create updated technologys full of topics for interviews

[@bluesibilings2806]

No words to describe for your explanation, became huge fan of you!!!!!🥰. Please create a series for other Junit topics also like spy, fake and dummy etc..

[@BaluKompalli]

Great tutorial. I have followed each and every video and have practiced the same flow. Got successful response.

[@mdshahnawaz5949]

It is awsome how you are helping us. Please do release the next part soon ie writing Junit for controller.

[@CodeDecode]

Sure Shahnawaz 👍🙂

[@manognajoshik8465]

Wonderful!! I am a regular follower of your tutorials. Can you please cover everything related to junit and mockito for all layers?

[@CodeDecode]

Sure Manogna 🙂🙂

[@shilpajagdeesh7156]

very helpful. great understanding. Please cover all remaining Junit along with controller.

[@ankitshah4211]

Marvellous work you are doing...waiting for next videos eagerly

[@CodeDecode]

Thanks Ankit 🙂👍

[@KateShubham]

This is quality stuff! Are next parts already there now?? can somebody provide link to next parts?

[@dileephl2709]

Your explanation is very good, please do cover the remaining things also. We will support you!!

[@CodeDecode]

Thanks 🙏👍 sure 😊

[@bhavikjoshi1561]

Thanks for hearing my request so sooner than later.. I appreciate it,,😊😊

[@CodeDecode]

Thanks for suggesting Mockito. 👍👍nice suggestion Man 👍👍

[@lakshmichepeni6903]

Thanks for the video.. could you please make complete video for Mockito including the topics mentioned at the ending of this video

[@abusufiyanrafey4555]

very helpful..🙂👍Please come soon with other parts..Thanks!!!

[@CodeDecode]

Thanks sure 👍👍🙂🙂

[@shrutik1863]

Waiting for next video in series, thanks a lot💐

[@CodeDecode]

sure Shruti we will upload it soon

[@rakeshburra7655]

Thanks very neat explanation, Waiting for next video on Mockito

[@CodeDecode]

Sure we will create it soon

[@kalavalaharipriya6407]

Nice and good understanding tutorial, please help to cover all the concepts related to JUnit testing

[@CodeDecode]

Sure we will upload soon 👍👍🙂

[@VVV-xf5vl]

Thanx, do the the rest please. It is a great list of tutorials

[@CodeDecode]

Thanks . Sure👍👍

[@rakeshkachhadiya]

Great work again.

[@CodeDecode]

Thanks Rakesh

[@raakesh4652]

These videos are very helpful.... pls cover the remaining topics....

[@CodeDecode]

sure we will cover it soon

[@hussainbasha8106]

Thanks for the great session on mockito junit could please cover the remaining parts like controller all those concepts.

[@CodeDecode]

Sure thing!👍👍

[@swapnilmishra697]

Thanks for this series

[@CodeDecode]

😊😊

[@RanjitKumar-kb7zt]

Great explanation. Please cover remaining as well from Junit :)

[@CodeDecode]

sure Ranjit we will create it soon

[@RanjitKumar-kb7zt]

@@CodeDecode Thank you

[@NIKHILKUMAR-it4nj]

like the way you are explaining mam , waiting for another junit on controller 🙏🙏

[@CodeDecode]

Sure Nikhil 👍👍

[@pritesh427]

Hi Maam, such a great explanation.!! Can you please upload the third video, covering the test cases for controller class?

[@CodeDecode]

Sure 👍👍

[@truthreveal6521]

How to mock private methods . Plz continue these series

[@CodeDecode]

Sure 👍👍

[@akashsaha9366]

Thanks, please make the next video on spy and mockito

[@CodeDecode]

Sure Akash 🙂👍

[@anandnerurkar2572]

good one and nice explainaion, pls add for fake ,spy,dummy also

[@CodeDecode]

Sure we will create video on it soon

[@sanketh768]

Please make a detailed video on other annotations like spy mock, mockbean and other annotations as well.

[@CodeDecode]

Sure 🙂🙂

[@sanketh768]

@@CodeDecode will be waiting for your video

[@codingmoments]

Thnx for this video

[@CodeDecode]

you're welcome

[@snehalakkar9842]

Very good tutorial, pls cover further part of this tutorial and spy

[@CodeDecode]

Sure we will cover it soon

[@bhavikjoshi1561]

please create next part. I will be waiting for it. thanks

[@CodeDecode]

Sure Bhavik 👍👍

[@AshutoshMohanty07]

Thanks for hearing the request. 🙏🙏

[@CodeDecode]

You're welcome

[@sufiyanKhan-wn9wq]

PLEASE MAKE VIDEO ON Controller junit and remaning topics of mockito ....

[@CodeDecode]

Sure 👍

[@oldaccount137]

Very helpful mam please make furthur videos

[@CodeDecode]

Sure 😊👍

[@kiranlulla6540]

Thank you

[@CodeDecode]

Thanks Kiran 😊👍

[@rishiraj2548]

👍👍

[@bharukeerthi1986]

Great .. please cover remaining topics

[@CodeDecode]

sure we will cover it soon

[@neha6000]

Nice video

[@CodeDecode]

Thanks 😊😊

[@virajpatel5859]

Nice.

[@CodeDecode]

😊Thanks

[@utkarshshukla4505]

Excellent video mam 👍 , mam can you please cover all

[@CodeDecode]

sure we will cover it soon

[@ankitambekar6073]

Hi, please upload a next video of the mockito series.

[@CodeDecode]

Sure Ankit 👍

[@harshitsachdeva4836]

How to throw checked exception like IOEXception using thenThrow of mockito ?

[@swarnavakhara7501]

Please make a video on junit controller class as well

[@CodeDecode]

Sure 👍👍

[@lakshmipriyaalagiyamanaval3059]

Please create the subsequent part. We are waiting

[@CodeDecode]

Sure LakshmiPriya👍👍

[@nareshk4880]

please do video for rest controlloer junit with mockito

[@kavithaeswaradoss8970]

Pl add a video on doreturn thenreturn controllerjunit tests do nothing etc

[@velankayalasrinu2190]

please do for the controller also

[@CodeDecode]

sure we will create it soon

[@ionadsouza1066]

Please make another video

[@CodeDecode]

Sure we will create it soon

[@prathappoojary8585]

Do the video spy,, dothrows ..ect pls

[@CodeDecode]

Sure 👍👍

[@satyanarayanareddyb3052]

Please do the controller Junit..

[@CodeDecode]

Sure 👍👍

[@sarannav365]

@@CodeDecode can u please provide the link for controller Junit?

[@shubhamraj5184]

Where is Controller class Junit

[@aakashyadav9117]

only 5 likes remaining for 500

[@pavanpavankalyan2790]

how can we write test case for printstacktrace in catch and Logger Messsages (log.isDebugEnabled)