How to Unit Test your Business Logic in Flutter
Вставка
- Опубліковано 31 лип 2024
- This tutorial goes over the basics of unit testing and how to determine which unit tests to write and how to write them in Flutter.
00:00 - Intro
00:34 - What is unit testing
01:11 - What is a unit
02:11 - Rules to define units
04:40 - What do we unit test
05:54 - Unit test anatomy
06:40 - Unit test naming
08:12 - Unit test structure
09:10 - Writing unit tests
10:11 - Write ViewModel Tests
14:05 - Practice unit tests to write
14:51 - Setup unit test run shortcut
Source: github.com/FilledStacks/stack...
Written tutorial: www.filledstacks.com/post/how...
You're my knight in armour. Always there to pump up my skills for flutter.
hehe! That's great to hear. I'm happy to help
I've been searching for four days how to run multiple tests. Thank you! Open terminal, point to project, type "flutter test" and that's it! Thank you big time!
You're very welcome. It's weird how small things are so hidden in the docs. You would expect that to be easier to find.
Seriously Dane!!! I really appreciate your time and effort dude. You're a major help. I hope to see you around Cape Town sometime. I hope we can return the favour someday. You rock!
Thanks Wayne! I appreciate the kind words :) One day when we move around freely again we'll have a higher chance of "bumping" into eachother. Thanks for watching and supporting man. much appreciated.
Dude I don't know how to thank you. you will find me on every social network appreciating your work much thanks.
I planned today to take a full testing course on udacity this video and the course will help me test my apps.
Keep rocking 🔥🔥🔥
Niiiiiice!! Testing is a pretty broad subject so I'm happy I could help shed some light on it. I'm making some additional videos after this as follow ups as well. And thank you very much for all the support. I really appreciate it.
if you have any additional questions after the testing then please let me know and I'll work those questions into my next few videos as well.
@@FilledStacks Yes, in the next episode you said that you will start testing services please include when you get data from firebase. The firebase I already abstracted as firebase service and its functions. I made implementation separate class for it. It will be great if you showed us an example of how you test Firebase service. I want to know more about how you manage to do it within your process as no need to test Firebase itself. I wonder how you test the implemented functions of Firebase service within your app. Did you test the logic only inside The viewModel as you did in This episode or you do more Things To test Firebase Service?
really big thanks for your tutorials&libraries&efforts. Thank you!
I appreciate that! Thank you for leaving the comment.
I always ran away from testing but after your deep explanation everything is coming together. I wanted to learn testing for quite a long time but didn't find anything to motivate me. Now I just love it. Thanks for the effort that you put into your content. And the most awesome thing is that its for free.
I have a little question which might be weird but still its in my mind so I think I should ask it.
What happens to the testing code that we write after we compile our app? Does it get removed automatically or we have to do something manually to prevent the testing code from being compiled?
That's awesome to hear! Thanks for letting me know. I'm happy you enjoy unit testing :) It's nice to work with once you get the hang of it.
You don't have to do anything. Flutter only builds the code in the lib folder. Nothing else :) Test files only run on your machine when you execute the command to run it.
@@FilledStacks Thanks alot.
I just wanna thank you for such great videos, this really has helped me to be a better programmer👍👍👍.
You're very welcome. It makes me happy to hear that I've made such an impact. Thanks for watching!
Thanks for this! Appreciate your efforts!
You're welcome. I appreciate your comment
Perfect timing. I have just started learning Unit testing. Thanks.
Awesome! It's going to be nice and code improving journey. Goodluck.
Hi bro I need some help from unit testing
What do you need help with?
I am new in unittesting bro.how to start in unittesting any idea.and also structure of project in unittesting
The same way I show in the video :) that's why the guide is there.
its been a long time my friend , we missed you
also , i have been thinking lately about TDD and how to implement it without complicating my code and this might be the starting point
:) aaaaawwww man ... And yes, I do a very non-strict version of TDD. I think just using these "rules" in here will help you define what to test or what to define as a unit. As you gain more unit testing experience that will most likely change but I think it's a good starting point.
Keep them coming, please 😀. Thank you, Dane! 👌
David! I will try my best to expand on the unit testing more. i think i'll most likely have to make a course to fully show the technique and approach to covering your code base with tests.
@@FilledStacks can't wait to see it.. it's always interesting to see your take on all these stuff. Very nice job man, and as usual, excellent video!
your channel should have 1000000000000000~ subscribers .
haha, that's more people than there are in the world but I'll take it !!!! :) One day we'll have a bigger community, it takes time and lots of sharing
I think I just found a gem, thank you very much
I'm very happy to hear that :) There's a new video out for unit testing as well.
Great video as always! I, myself, have thought about changing to more of a TDD aproach:)
I do a very laid back TDD approach compared to how I use to do it. It's been very beneficial so far. I'll share more about that as I figure out what I'm doing to make the process less intrusive for new comers to TDD.
Please! add a video of How to use Authentication Service in your stacked architecture.
Hey, I don't think that's required. It'll be literally exactly the same as I showed in the firebase series. Exactly the same, using stacked doesn't change how services are used. Service classes are used in every architecture.
Thanks man!
It's my pleasure to have made it.
Can we get this guy a million subs!!!
Haha, thank you and I appreciate it! I'd be happy to get to 100k soon :D
I know unit tests are supposed to be independent of each other. What is your approach to writing tests for calls that depend on and adjust state for each other?
I don't have an approach for that because I personally spend my time making sure that's not the case. Won't be able to give you any pointers there. i keep unit tests in units, testing only 1 unit of work / 1 state at a time.
Can you do a video on how to use gRPC framework on flutter ?
I probably can not. I have no idea what gRPC is. Been hearing about it. If I ever have to use it in production then you'll get a tutorial. I only share what we use in production as a team, so far I've never used gRPC so I've got 0 knowledge of it.
Wow !! I'm falling in love with this last series and I'm starting to use it in my apps !! I am now confronted with error handling. How do you do to make them climbed up from Services to the View ? Are you planning to release a video on this topic or do you have some recommendations regarding this subject ? Thanks in advance
Awesome! that's great news. I will make a video about it. I'm trying out things myself and will need to add some additional functionality into stacked to do it the way I want it to be done. currently I throw exceptions and it's handled in the viewModel. I'm removing the try/catch statements. In the specialised viewmodels we already have the onError callback which returns your exception and sets a property on the viewmodel. I want to build that into the base viewmodel as well to handle errors thrown. But I will make a video about it.
Ok !! Nice !!
I'm going to try your way and see how efficient it is.
I'll be waiting your next videos for sure !! ❤
I've recommended your videos to my friends, but they are beginners and kinda dont know where to start. Can you post a Roadmap to watch your videos? like in what order we should watch them , that would be really helpful. I use the numbering in the Github repo for now. Also , can you add some "playlist" like feature on the website? to group all series related articles in one place. Like the firebase series or architecture series in youtube playlists.
that sounds like quite a lot of work and i'm already struggling to put out 1 video every 2 weeks. We won't have time to dedicate to the website, right now. I don't recommend learning for the same of learning either. build something, if you need to know how to do just one thing then google that and learn that from my videos or the other creators. Just going through content doesn't actually work as we can see from school as well as university to some degree. They should learn what they need to know, i probably know less than 30% of flutter. I only learn the things I need to know to solve to problem at hand.
As always, outstanding tutorial. Would really love to see a series on TDD! Quick couple questions: do you use widget tests in when you test your code? What is the point of setup/test_helpers as you don't use them at all? Finally, do you recommend saving globalKeys in view models, because you mentioned no UI code in the viewmodel. I will commonly store the globalKey in a viewmodel, and call .validate(), and .save() for a formKey within a function in my viewmodel.
Thank you.
- I don't use widget tests
- setup/test_helpers and data will be used in the next video where we have to register services before tests and setup data for the test we'll add functions in those files that wrap all that functionality
- No, no ui code in the ViewModel. You won't be able to unit test properly because it'll be reliant on flutter which you can't mock out.
@@FilledStacks Thanks for your quick response! Can't wait for your next video
@@FilledStacks Is there any particular reason why you don't use widget tests? I write unit tests for all my view models and services but widget tests are hard to test with a view model. Do you consider it not worth it to test out widgets?
Yes, that's exactly the reason. I don't find it worth it to write. I would rather use it for full integration testing instead of testing a single widget.
Hey love your videos. It really has made me realize how many mistakes and pitfalls I've made in my programs and makes me a better programmer overall. For your note on widgets not being in the ViewModel. In one of my apps I have put the streambuilder widget which listens to onauthchanges from firebase in my viewmodel (based on the log in status a different page is returned). I did this as I did not want the routing logic within my UI but it violates the rule of not having widgets in my viewmodel. Do you have any advice on how better to implement this feature?
Hey, yes. You can use a StreamViewModel and do the same thing in your viewmodel then simply call the navigationService.navigateTo with your route name you want to go to.
Question:
What’s if the methods being tested in the viewmodel use dialog service or snackbar service?
How to test this type of method?
good questions, you create a mock for it using Mockito and then you can confirm it was called with the correct data and you can make it return anything you want incase you're expecting a response from it. That's in the mocks video :D
Oh those snippets for creating tests etc looks sweet, what did you do to get them?
Thanks Robert. I made them, i posted them to a gist. I'll be updating these snippets as I need more things during development. gist.github.com/FilledStacks/b57b77da10fdcb2d4d95a28de4a4ced4
@@FilledStacks Awesome looking forward to more! :)
W/FlutterActivity( 7241): Tried to automatically register plugins with FlutterEngine (io.flutter.embedding.engine.FlutterEngine@4d9c159) but could not find and invoke the GeneratedPluginRegistrant..
..
.
How can I solve this issue?!?
Make sure you're not trying to unit test something that depends on flutter or a plugin
@@FilledStacks
Flutter showing this issue because I didn't migrate my project in
Upgrading pre 1.12 Android projects
@@berozgaarengineer3999 Aaaaaah, I see. thanks for sharing the solution
@@FilledStacks I am implementing firebase authentication in flutter project but I'm getting error due to above mention issue (tried to automatically register...), I tried solution upgrading pre 1.12 Android project. But works for me!
..
Please make video on upgrading pre 1.12 android project..
Hi, Please make video on MVVM / MVC / MVP Architecture, which is most commanly used in a 5 -20 minute video is possible.
Hey, Stacked is based on mvvm so you can go through those and you'll see how I use it.
@@FilledStacks okay, thanks
@@FilledStacks , can I know if we are using MVVM pattern / stacked,
Then where should we handle UI dailogs and routing, permission denied prompts, etc, do we need to do all in provider { View Model } by taking context in method call parameter or we should do in UI
Thankyou
@@mruduladdipalli5417 Hey, stacked is a package that implements a version of MVVM. I show all of that in my stacked videos. Interfaces are available in the viewmodels where the business logic lives, but the dialog is shown at a different place. It'll be better to watch my latest state management setup video.
How to test sqlite database without running the emulator?
You'll need an implementation of SQLite that allows you to run an in memory version of it.
Anyone watching this during quarantine?
not exactly watching during quarintine but I made it during quarintine :)
@@FilledStacks lol
@@gameplaymaster5502 :)
Your videos are great but people get bored when you only talk & show an Article in a video for long time. I'd have loved it more if you were also doing the things you were explaining from the article/composition in realtime. That'll make the video shorter & people won't get lost like I get lost in the example part
It's just my personal opinion
Hey Hey, thanks. I prefer to talk about the actual implementation and give more details when I'm writing the code. The first part should serve as an overview. Most viewers cannot translate plain english directly into the code so me talking in normal english and showing the code could cause even more confusion because I won't stop to explain the code.
It's easier to follow if you a path of where we're going. Just jumping into things make the tutorials harder to follow.