Mock, When and ThenReturn with Mockito - JUnit Tutorial

Learn about what a mocking framework is used for with unit testing, when we it would want to use it, and how we can use the Mockito framework within our tests.
This tutorial involves testing a class method in isolation despite its dependency upon a database call. We will understand why mocking is useful and how we can approach it in 3 steps.
Link to GitHub repo: github.com/4neesh/TH-cam-Cha...
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Visit my website to also see my blogs: aneesh.co.uk

[@mrpunch_777_]

Thank god you popped out as I was looking for a mockito tutorial. Clear explanation, good speed, HD quality, and understandable examples. You're doing great, keep it up!👍 🔥

[@AneeshMistry]

Thanks a lot for your comment!! Glad it could help!!

[@dariamusinova7113]

Thanks a lot, the most comprehensive video on youtube, watched like 3 other before this one... everywhere lots of unneeded information, unnecessary repetitions of useless information. Your video is exactly on the topic, nothing more, nothing else. Please make more videos of that kind :)

[@AneeshMistry]

Thank you so much!!

[@smithcodes1243]

This channel is underrated. Subscribed!

[@AneeshMistry]

Thank you!

[@jagadeeshp1163]

YOUR ARE MY SAVIOUR BROTHER LOVE THIS PLAYLIST

[@ShubhamSharma-sf8wk]

Man I was so confused when I saw when and thenReturn in my org's code, thank you so much for this video. You saved me.

[@AneeshMistry]

I’m really glad it helped! Thank you!!

[@ekrarefaz8594]

Hey man a little late here, but I hope you're doing well. I loved the series and helped me adapt to my new work super fast!

[@AneeshMistry]

That’s so nice to hear! Thank you!!

[@shikuanchung4650]

Clear and straight to the point, nice job!

[@AneeshMistry]

Thank you!

[@9cashew]

simple and best explanation of the concept..It would be awesome to see more detailed videos with other options of Mockito.

[@AneeshMistry]

Thanks! More mockito from next week

[@marko8640]

Clear and concise. Keep it up!

[@AneeshMistry]

Thank you!

[@aldolunabueno2634]

This is the one. This is the video I was seeking. Thanks!!

[@AneeshMistry]

Thank you!!

[@chizebamaulu9053]

Clear and concise. Wonderful video. Thanks for this

[@AneeshMistry]

Thank you so much!

[@gonzalooviedo5435]

Thanks, nobody explain what when and thenReturn do, and is very simple, is, when you executed this Injected Class, simulate (thenReturn) with the data is in the setup or init or before method annotated.

[@AneeshMistry]

Exactly it, thanks Gonzalo!

[@srujanan]

Thanks for the video! The GitHub Repo link was much useful.

[@AneeshMistry]

Thank you!

[@aelafdev]

clear and concise explanation!

[@AneeshMistry]

Thank you!

[@bilaldmx]

Lovely men, so simple exaple to understand, i was Lost in complex examples. thank you 😊

[@AneeshMistry]

Thank you!

[@TomaAndreiMusic]

very nice explanation and very pleasant voice. keep going!

[@AneeshMistry]

Thank you!

[@user-38e9f4e7cu]

what a great video! thank you so much! it was better than googling around for 1 hr+!

[@AneeshMistry]

Thank you!!

[@snvarun9979]

Great tutorial

[@AneeshMistry]

Thank you!

[@user-md4mx4uq4q]

Best explanation. Thank you!

[@AneeshMistry]

Thank you!

[@loveyouself5389]

Brief and superb!

[@AneeshMistry]

Thank you!

[@moinkhan]

Simple and powerful!

[@AneeshMistry]

Thank you!

[@Jadenyuki35]

Very nice tutorial.

[@AneeshMistry]

Thank you!

[@sahilvishwakarma6509]

Like I am test testing the business service layer of my spring rest web project with Spring data jpa . So should I create mock stubs for repository interfaces for testing the Business layer which is interacting with DAO layer?

[@denislensky9132]

jeez, man, thank You so much

[@AneeshMistry]

Glad it could help 😄

[@hbycodingacademic7667]

at 5:18, is the setup function be the same meaning as hotelDao annotated by @Mock?

[@zahirulislam2097]

Very helpful videos. Thank you again. One thing I faced was mock object could not be created.
I was getting:
Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module
Thank I had to add jvm argument: --illegal-access=warn --add-opens java.base/java.lang=ALL-UNNAMED

[@loveyouself5389]

We need jacoco coverage video!

[@rishiraj2548]

thanks

[@HenryLeu]

can you also make a video for REST API using Java ?

[@AneeshMistry]

Hi Henry, please check out my Spring playlist where we create a fullstack MEAN application

[@deepasreedhara5265]

good accent and tutorial.

[@AneeshMistry]

Thanks!

[@rahulbhiwre8698]

how to test if method return type is void ?

[@AneeshMistry]

Hey Rahul, check out my video on Mockito Verify, where you can verify the behaviour of a void method. th-cam.com/video/lbN2nfsC7C4/w-d-xo.html

[@jeetchatterjee9628]

Mockito.doNothing

[@barreneric00]

Sprit ful faith. Based mov. Mobjective