Flutter TDD Clean Architecture Course [2] - Entities & Use Cases

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In the first part, you learned the core concepts of clean architecture as it pertains to Flutter. We also created a bunch of empty folders for the presentation, domain and data layers inside the Number Trivia App we're building. Now it's time to start filling those empty folders with code, using TDD, of course.
Whenever you are building an app with a UI, you should design the UI and UX first. I've done this homework for you and the app was showcased in the previous part.
The actual coding process will happen from the inner, most stable layers of the architecture outwards. This means we'll first implement the domain layer starting with the Entity.
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[@ryftus5004]

TAKE NOTE! For people that just started now, the latest equatable requires you to use props rather than super constructors. So, Rather than this:- class NumberTrivia extends Equatable { final String text; final int number; NumberTrivia({ @required this.number, @required this.text }) : super([number,text]); } //WRONG Do this:- class NumberTrivia extends Equatable { final String text; final int number; NumberTrivia({ @required this.number, @required this.text }); @override List get props => [text, number]; } Peace!

[@mostafaabozaina4146]

Not wrong it's just old version than the current available one

[@ahmedmustahid4936]

Thanks a lot

[@fikrihaikal1353]

Thank you so much bro, you're a live saver

[@anassa6737]

for failures on core/error how i can solve the problem when i put the the lsit on super the respone to me no argmunts expection

[@urosteofilovic2394]

@@anassa6737 I have same problem, hadn't found the solution yet

[@muikrizalit6449]

7:30 equatable: ^1.0.1 Use @override List get props => [text, number]; instead of : super([text, number])

[@psybitcoin]

and in abstract class Failure?

[@virenkhatri1932]

Thank You, helped a lot! also, what about abstract class Failure?

[@utarnburanasaksri8241]

@@virenkhatri1932 No need to override the props in abstract class. Instead, you will need to override props in the implemented class.

[@David-rc8nm]

I'm coding for years as a hobby but you know.. never did anything in any professional manner but I always wanted to get better... and I have to say that until now it was difficult for me to comprehend the process of TDD and how to design a software in a professional or efficient way, or for the least part how to keep solid and clean code. Just from watching this video several Lego blocks connected in my head so thank you so much! And I cant wait to go through this course !!

[@ResoCoder]

I'm glad those Lego BLoCs 😉 fell in place for you!

[@matiasgomez9416]

domain/entities/number_trivia > 3:50 --> JSON core/error/failures > 12:30 --> abstract class domain/entities/number_trivia_repository > 15:50 --> abstract class test > 20:30 test/.../domain/usecases/get_concrete_number_trivia > 22:30 --> mockito domain/usecases/get_concrete_number_trivia > 26:20 run program > 36:50

[@h3w45]

thanks

[@scottb2284]

I really appreciate this tutorial so far because it's language agnostic. My struggle with coding has been less about understanding a particular language/dialect (they all say/do the same things, just in slightly different ways) and more about knowing how to structure a code base, where to put the files, how those files relate to each other, what to name them, when to write them (and why). This course is an architectural blueprint I can follow in any project in any stack. That way I'm not reinventing the wheel for every project I do and I'll get a lot of practice repeating these patterns, which means that over time I'll get faster at creating new projects. Thank you!

[@ResoCoder]

That was my goal in creating this course. Thanks for learning here!

[@clown7094]

I feel the same bro

[@isurujn]

Hear hear. After almost 10 years of coding, I still struggle with this. This video series is a gold mine. I'd pay for it if it was behind a paywall.

[@bascelik91]

It took me 5 iterations and 2 months to understand what you are doing :) thanks Matt !

[@luizmoraes4371]

Pls update the course to Null Safety :)

[@anassa6737]

did you solve it

[@vayshnavisivarajah485]

Did someone find a solution please ?

[@cnawico]

We need an update for Null-Safety, at least just a written one for the tests part. The production code is easy enough to adapt but I find it very difficult to adapt the tests. Mockito has documented solutions to the issue but given this is my very first foray into TDD, all I read is mumbo-jumbo... Being specific, the IDE shrieks at me when using "any" as an argument matcher. I have no idea how to make this pass null-safety.

[@giovanniitaliano4725]

Have you solved this issue? I'm facing the same, thanks

[@mbabuglia]

mockito doesn't play well with null-safety. You should switch to mocktail. The syntax is mostly the same, the migration is relatively easy.

[@legardemontcho6739]

I had the same problem. In writing the test every time you give a different number of tnumber, the test will not be conclusive. I think "any" was just an example but if you want the test to work, you have to give tNumber there.

[@anthonyjosuejarabustamante5314]

@@mbabuglia Using mocktail instead and it's working now. Thanks!!

[@anthonyjosuejarabustamante5314]

test( 'shoud get trivia for the number from the repository', () async { //arrange when(() => mockNumberTriviaRepository.getConcreteNumberTrivia(any())) .thenAnswer((_) async => const Right(tNumberTrivia)); //act final result = await usecase.execute(number: tNumber); //assert expect(result, const Right(tNumberTrivia)); verify(() => mockNumberTriviaRepository.getConcreteNumberTrivia(tNumber)); verifyNoMoreInteractions(mockNumberTriviaRepository); }, );

[@alfonsoisraelosorioavilez7]

Excellent video course, the form of how you explain the things and the way of how the video was created is awesome. Thank you very much for share your knowledge with us, after watch this video I think that this is the architecture that I go to implement in my future projects, TDD + Clean Architecture + Bloc, it is simply a jewel.

[@fridakalos]

The Best flutter course Ive found, just keep posting, you've got followers. Keep waiting for your videos.

[@fredericowebmaster]

Your videos are amazing. Your clean language and dedication to teaching are very impressive to me. Thank you for sharing your knowledge with us.

[@yanuaryusufadika7045]

This is what I looking for. Somehow senior programmer always told to me that we need to do TDD process when we code clean architecture. Unfortunately, I don't understand what the TDD is . In my desperate situation, I tried to find out TDD on youtube. And I found it, very good dude, love your video 👍👍

[@06dsyaniketnemade52]

Your teaching directly hit to heart bcz you make explanation as simple as possible .... And its Feels good i appreciate it!💯

[@bytebrunoOld]

2022 - What I did to work => // Dependencies - pubspec.yaml: dependencies: flutter: sdk: flutter cupertino_icons: ^1.0.2 get_it: ^7.2.0 flutter_bloc: ^8.0.1 equatable: ^2.0.3 dartz: ^0.10.1 internet_connection_checker: ^0.0.1+4 http: ^0.13.4 shared_preferences: ^2.0.15 dev_dependencies: flutter_test: sdk: flutter mocktail: ^0.3.0 ------------------------------------------------- // NumberTrivia entity (override instead of super constructor) @override List get props => [text, number]; -------------------------------------------------- // Test file with mocktail class MockNumberTriviaRepository extends Mock implements NumberTriviaRepository {} void main() { late MockNumberTriviaRepository mockNumberTriviaRepository; late GetConcreteNumberTrivia usecase; setUp(() { mockNumberTriviaRepository = MockNumberTriviaRepository(); usecase = GetConcreteNumberTrivia(mockNumberTriviaRepository); }); const tNumber = 1; const tNumberTrivia = NumberTrivia(text: 'test', number: tNumber); test('should get trivia for the number from the repository', () async { // arrange when(() => mockNumberTriviaRepository.getConcreteNumberTrivia(any())) .thenAnswer((_) async => const Right(tNumberTrivia)); // act final result = await usecase.execute(number: tNumber); // assert expect(result, const Right(tNumberTrivia)); verify(() => mockNumberTriviaRepository.getConcreteNumberTrivia(tNumber)); verifyNoMoreInteractions(mockNumberTriviaRepository); }); }

[@sagarkrishnabose8612]

Thanks, man! Saved a ton of time for me :)

[@bytebrunoOld]

@@sagarkrishnabose8612 No worries! I'm glad to hear that, it was a pain for me haha. :) edit: I just updated the pubspec here. I changed the connectivity_plus dependency to internet_connection_checker due to null safety issues with the connectivity packages.

[@marlonsubuyu2012]

Thanks man, it worked :)

[@matheussoaressilveira8408]

Thank you for this course! I'll base over this arquitecture for some future personal projects using Flutter.

[@programan6391]

This guy deserves be (very well) paid by Google.

[@dc5]

This is great, thank you for such an awesome explanation. Just two things I'm struggling with, 1 - Do you create all that folder structure for each "feature" in your app, both in the source and test folders? 2 - Do you create separate classes/files for every single method (what you call use case) of every feature? Loving the way you are explaining TDD with Clean Architecture for Flutter, but can't wrap my head about how many files and folders are required for creating just one screen with only two api calls. I'm probably missing something. Thanks a lot Reso!

[@ResoCoder]

I'm glad you find this valuable! The answer is yes and no at the same time. That is, you should create separate folders for features and files for use cases if you're strictly following Clean Architecture. However, if you feel that "perfect is the enemy of the good", you can also just scratch the use cases and put their logic into a BLoC. The bottom line is - it's all malleable as long as it's maintainable 😉

[@dc5]

@@ResoCoder Thanks a lot for the quick response, that's true, it can all be adopted to suit particular needs as long as it's maintainable, that's the key. I'm glad you mentioned in the first video that by following the clean architecture it doesn't matter which state management you use, I'm leaning more toward Provider, would love to see an explanation from your point of view on how to use Provider with Clean Architecture. Again, thanks for sharing! Awesome videos!

[@legardemontcho6739]

@@dc5 The biggest challenge would be to get the same result by changing BloC to Provider. I changed equatable to freezed and believe me I learned some new tricks about freezed while trying to fix the bugs. I also changed NumberTrivia to Order, it was still fadcinating. I'm just looking forward to the next step.

[@ShadowInfest]

Amazing tutorials, not just beginner stuff and always the same, everything is well structure and you deeply thought about what to tell and show! Relaxing voice, perfect speed and Linux haha. Keep up that good work!!

[@pashute12]

Thanks!! Two small remarks: 1. IMHO, a Failure abstract class should be called failure.dart not failures.dart. The folder holding it, which takes care of errors should be called errors and not error... 2. it would be good if you could give a short example of what kind of logic would be typically found in an entity. (say a line or two of code commented out, or quickly written and erased)

[@abderrahmansettani9843]

Keep going man, this is very well done, beautify explained.

[@Flutterdev6391]

Thanks bro it's little bit difflicult for beginning when you start learning TDD but I m sure at the end of this tutorials I will get atleast 60-70%

[@vedantkulkarni9098]

This is the best and most advanced flutter tutorial so far, keep going brother !

[@ikram-hasan]

This is the snippet for aaa test: "Arrange Act Assert test": { "prefix": "aaatest", "body": [ "test(", " 'should ${1}',", " () async {", " // arrange", "", " // act", "", " // assert", " },", ");" ], "description": "Arrange Act Assert test" },

[@carlosfau4492]

Very interesting presentation of an architecture. I have a question for you. In functional programming, you usually have an Either and a Try defined as Try = Either. A Future can be seen as an asynchronous version of Try. Why don't you use the Future error response to handle errors and instead adds an additional layer of wrapping the error inside an Either inside the Future? Is just to differentiate "Business" errors from "infrastructure" errors?

[@mdikcinar]

20:00 - Currenty if you right click the file that you want to write test and select go to test option, it will ask do you want create that file with same folder structure. Easy peasy :)

[@husseinqabalan775]

update ------------- for you test to work: 1.remove this line: class MockNumberTriviaRepository extends Mock implements NumberTriviaRepository {} 2.and annotate Main method with this: @GenerateMocks([NumberTriviaRepository]), PS. you need to import mockito/annotations.dart 3. go to terminal and run this command: flutter pub run build_runner build 4. import the new generated class. (MockNumberTriviaRepository) 5. done.

[@thanhvietnguyen998]

Thank you very much.

[@dedeandres455]

thank you bro, really helpful

[@ochornmapromise257]

Could not find package "build_runner". Did you forget to add a dependency? The error am getting

[@krishnateja296]

@@ochornmapromise257 run this in the project terminal -> flutter pub add build_runner

[@FabrizioCacicia]

Can't wait for the next part!

[@johnjackson4082]

At around 8 minutes you suggest writing tests on the entity if there is some logic in it. I think uncle bob suggests only testing the boundaries of the use case. The application only touches boundaries, not the entities. I don't think it is in his book but he talked about it at a conference when he talked about the originator of use case driven design.

[@hexdump8590]

I don't like to have dependencies in my code that I don't need. So, instead of dartz, why not just use a generic class with just a boolean to flag error/success and a member with the data (NumberTrivia) if everything is ok? Something like: class Result { bool success, T data }. By the way, awesome vids!

[@saadghazal9743]

type 'Null' is not a subtype of type 'Future' when i run the test

[@mirxtremapps]

i recommend this vs-code extension "Flutter & Dart Utilities", it let you create quickly equatable, mocks classes an more

[@SEOTADEO]

Thanks a lot for this video! Especially getting to know the Either type from dartz was helpful.

[@mugume]

Dude, you are the best at what you do. I love the quality of your tutorials, excellence at play. Thank you 🙏🏾

[@saadghazal9743]

hi i faced a problem with the any key word i just need to know how to fix it

[@mugume]

@@saadghazal9743 not sure buddy, but you could ask the author on the channel

[@saadghazal9743]

@@mugume i fixed it 🔥🔥🔥

[@user-xl2je5ul8t]

@@saadghazal9743 how

[@alisampson6639]

@@saadghazal9743 How did you fix it?

[@sametsahin10]

For those who are using Android Studio or IntelliJ as development environment, refer to this medium post for running tests. Select get_concrete_number_trivia.test as file instead of widget_test as it's mentioned in the post. medium.com/flutterpub/writing-and-running-widget-tests-from-android-studio-d63b9fea21c5

[@RobertWildling]

To the down-voters: At least be so fair and leave a constructive comment, so we know about the different points of views!

[@andreykaok9497]

I guess that down-voters are conservative xCode and Android SDK developers which understand that Flutter is really coming to win. ;)

[@wickedgummybear3104]

@@andreykaok9497 Doesnt even have to be that, might be that the program just is'nt running properly.

[@illiamaksymenko804]

only 7 for now, not so much..

[@RSPSify]

@@andreykaok9497 Honestly you are probably right. Between Jetpack Compose and Kotlin, I realized the only way out of "Hell" is platform independence. But many are just bitter over it, they see flutter as another change.

[@onwuasoanyageorge5364]

I long convinced myself that down-voters are bots. Can't tell me nothing else!

[@westiti6650]

I don't think async/await are necessary for a function definition that returns a Future : Future execute({@required int number}) { return repository.getConcreteNumberTrivia(number); } .But only when the Future is consumed such as: final result = await execute(number: Number);

[@loicngou9592]

Even your blog is well written , mamamyah..well done

[@baby45058]

hi i meet problem with Failure class Failure([List properties = const[]]) : super(properties); ->too many positional arguments i can not run test and i don't know which way i wrong

[@bmkgokong668]

remove the super(properties) at the end, same with the entities file - the documentation for Equatable is available on the dart-package page

[@afriendlyfellow]

in the test file, the variables usecase and mockNumberTriviaRepository should be marked as `late`, or else you will get compile errors like "The non-nullable local variable 'usecase' must be assigned before it can be used."

[@dc5]

Hi Reso, would be great to have some example of Update/Delete to see how you implement unit test for those. Thx

[@legardemontcho6739]

1) Thank you for the introduction to testing, it helps the beginner developer to improve his thinking. I followed your introduction and to understand it well I adapted it by changing equatable to freezed (Most recommended for equal value on pub). 2) I used an e-comerce order entity instead of triviaNumber. But I'm a little confused about how to write order test that contains customer?

[@06dsyaniketnemade52]

Big fan bro...big fan 🥺❤️

[@vladimirmbassi]

Awesome video, can't wait for the next parts

[@virenkhatri1932]

I wish there was a LOVE reaction on youtube. I don't just like it, i love it

[@BelgianDaSeeD]

Many thanks for your super clean tutorials ! Love them !

[@msayeed78]

Excellent. I never tested apps like this so it is new and little difficult to understand. I will search for tutorial on test.

[@uDropper]

I want to be a teacher and if my classes happen to have the same quality as yours, I will be very happy, you could make a tutorial about that.

[@VS.VishalSharma]

I can't understand this code in failure Failure([List properties = const []]) : super(properties); .what does it do exactly??

[@thedevkim2934]

Hi. can you do a refactor for the latest version of Dart ? Im having so many errors

[@conmeu6364]

for people who got "the non-nullable variable "..." must be initialized" error in the test file, u just need to add "?" at the declaration: void main() { GetConcreteNumberTrivia? usecase; MockNumberTriviaRepository? mockNumberTriviaRepository; setUp(() { mockNumberTriviaRepository = MockNumberTriviaRepository(); usecase = GetConcreteNumberTrivia(mockNumberTriviaRepository!); }) ; final tNumber = 1; final tNumberTrivia = NumberTrivial(text: 'test', number: 1); test('should get trivia from the number from the repository', () async { when(mockNumberTriviaRepository?.getRandomNumberTrivia(any)) .thenAnswer((_) async => Right(tNumberTrivia)); final result = await usecase?.execute(number: 20); expect(result, Right(tNumberTrivia)); verify(mockNumberTriviaRepository?.getConcreteNumberTrivia(tNumber)); verifyNoMoreInteractions(mockNumberTriviaRepository); }); }

[@lugardjulien5326]

For generating API fetching data I highly recommend retrofit package , also don't bother yourself writing the data class on your own , generate them with freeze package .

[@anassa6737]

how did you take off the null problem on test part

[@gersongallo6892]

I just found a gem, thanks man!

[@kecap_maniis]

im testing an object class instead of text and int. but its always return null. i did exactly what the video tells me....

[@AhmedAlaa-qs3ew]

type 'Null' is not a subtype of type 'Future' when running test code Any Help

[@gaweringo]

This video is from before when dart had null-safety. To fix this I switched from mockito to mocktail. It's almost a drop in replacement. when() needs to be turned into when(() => ) and any turns into any() but then it works for me.

[@ibensalcie]

How I solved it? 0. Use late while initialising the Repository mocks. late GetConcreteNumberTrivia usecase; late MockNumberTriviaRepository mockNumberTriviaRepository; 1. Changed mockito to mocktain : ^0.3.0 (Currently) 2. //Arrange will appear like so. when(() => mockNumberTriviaRepository.getConcreteNumberTrivia(any()),).thenAnswer((_) async => Right(tNumberTrivia)); 3. //act final result = await usecase.excecute(number: tNumber); 4. //assert expect(result, Right(tNumberTrivia)); verify(() => mockNumberTriviaRepository.getConcreteNumberTrivia(tNumber),); verifyNoMoreInteractions(mockNumberTriviaRepository); Test passes correctly.

[@eduardovinicius6047]

If you're having "type 'Null' is not a subtype of type..." paste @GenerateNiceMocks([MockSpec()]) a line above the main() instead of declaring the class yourself, then use "dart run build_runner build" (you must have build_runner added to your project, which you can do by using "dart pub add build_runner --dev"). When the mock is created just import it.

[@SpellOdyssey]

I really like your effort thank you so much, but I get some errors that I can deal with like the name of the class NumberTrivia needs to be overridden and the super [ Too many positional arguments: 0 expected, but 2 found. Try removing the extra ] line doesn't work for me, can anyone help me with this thank you again man I really appreciate your work and your detailed information on FLUTTER

[@westiti6650]

In the execute() function, you do not need to use async/await because the function already returns a Future.

[@ayushpawar9312]

If anyone is figuring out on how to get rid of the TypeError(type 'Null' is not a subtype of type 'Future') error, 1) Add build_runner package under dev dependencies in pubspec.yaml file. 2) Copy Paste this code 3) in the terminal, run this command: flutter pub run build_runner build // new imports import 'package:dartz/dartz.dart'; import 'package:flutter_num_trivia/features/numbertrivia/domain/entitites/number_trivia.dart'; import 'package:flutter_num_trivia/features/numbertrivia/domain/repositories/number_trivia_repository.dart'; import 'package:flutter_num_trivia/features/numbertrivia/domain/usecases/get_concrete_number_trivia.dart'; import 'package:flutter_test/flutter_test.dart'; import 'package:mockito/annotations.dart'; import 'package:mockito/mockito.dart'; import 'get_concrete_number_trivia_test.mocks.dart'; // new annotation @GenerateMocks([NumberTriviaRepository]) void main() { // initialization outside of setUp final tNumber = 1; final tNumberTrivia = NumberTrivia(number: 1, text: 'test'); final mockNumberTriviaRepository = MockNumberTriviaRepository(); final usecase = GetConcreteNumberTrivia(mockNumberTriviaRepository); test( 'should get trivia for the number from the repository', () async { //arrange when(mockNumberTriviaRepository.getConcreteNumberTrivia(1)) .thenAnswer((_) async => Right(tNumberTrivia)); // act final result = await usecase.execute(number: tNumber); // assert expect(result, Right(tNumberTrivia)); verify(mockNumberTriviaRepository.getConcreteNumberTrivia(tNumber)); verifyNoMoreInteractions(mockNumberTriviaRepository); }, ); }

[@enriquemarin8842]

Thank you very much, bro

[@simileoluwaaluko7582]

Works to fix the error type `` 'Null' is not a subtype of type 'Future ``. Thanks mate

[@ibensalcie]

How I solved it? 0. Use late while initialising the Repository mocks. late GetConcreteNumberTrivia usecase; late MockNumberTriviaRepository mockNumberTriviaRepository; 1. Changed mockito to mocktain : ^0.3.0 (Currently) 2. //Arrange will appear like so. when(() => mockNumberTriviaRepository.getConcreteNumberTrivia(any()),).thenAnswer((_) async => Right(tNumberTrivia)); 3. //act final result = await usecase.excecute(number: tNumber); 4. //assert expect(result, Right(tNumberTrivia)); verify(() => mockNumberTriviaRepository.getConcreteNumberTrivia(tNumber),); verifyNoMoreInteractions(mockNumberTriviaRepository); Test passes correctly.

[@ajinzrathod]

32:07 The non-nullable local variable 'mockNumberTriviaRepository' must be assigned before it can be used.

[@TheGT240]

Just use lazy initilization - with keyword 'late': void main() { late GetConcreteNumberTrivia usecase; late MockNumberTriviaRepository mockNumberTriviaRepository;

[@juniormalcom6603]

@@TheGT240 thanks

[@TakinProfit]

I really prefer to package by feature, but within each feature folder, I keep things hexagonal. This just makes a lot more sense to me than layering.

[@mohsenuss91]

Thank you for this great tutorial !!! Would you please make another one for more real use cases such us SIGNUP/LOGIN using this TDD method?

[@user-eh5wo8re3d]

Using failures instead of the provided catchError feels very much like an anti-pattern to me. What is the benefit of returning failures and having to handle them further up instead of just handling exceptions?

[@panosgr7228]

Your code will be much more organized if you can catch errors as soon as possible (ie in the Repository) and if you return Failures you won't need to worry about exceptions throughout all the rest of your code. You can have a control-flow depending on whether the result was a Failure or not anywhere in the Domain and pass the needed data to show in the Presenter. If you need to add a new type of Failure you can simply handle it in the Repository and you wouldn't need to search throughout the entire codebase for the line which is catching the exception/failure.

[@habibbellia2607]

Thank you I am interesting for this architecture 👍👍👍

[@hellofolks5606]

Hey Reso, I'm a bit confused by something. The (_) in .thenAnswer((_) async => Right(tNumberTrivia)) is an argument, correct? When I hover over it, it merely says it is an Invocation, and I can't find any documentation regarding this. Also, if _ is an argument, what is its value in this case? Is it what is returned by getConcreteNumberTrivia(any)? Or is it something returned from when? Thanks!

[@hellofolks5606]

Also, why do we need to declare async after .thenAnswer? Isn't async used to indicate to flutter that we will be awaiting something?

[@dharmikthakkar3642]

Very rare and useful series. Very Nicely explained...I also have a question. If I got 2 features then do I have to create all folders again for 2 different features? Like do i have to create 2 data folder, domain and presentation folders?

[@natdiv9]

Thank you for your video which contains clear explanations I still have a question about the entities, since with this architecture, each feature contains three main folders representing the 3 layers, domain, data and data source. What if an entity is used in two different features? Do we write it twice?

[@saadghazal9743]

hi guys this tutorial is powerful and it's really great thank you but i'm having an error in the any key word i set the int parameter to int? to make it pass but that's not enough any help

[@trungbui7518]

i have the same problem. Help me

[@user-tf4cd2rw3t]

you probably need any() instead of any

[@programmingnight]

Can u do Tdd clean new course in 2021 with flutter 2? this Architecture is the best I ever found for flutter. Thank You.

[@user-gc6fu9fd5u]

what was the dart version used here?

[@nautiluscove4730]

Not sure why, but lately all programming videos are way better x 1.5 speed :)

[@jeffreymercado1659]

You made me laugh with the 'Spaguetti code ca´nt be tested'

[@mateuspedroso6547]

It's so good this video! thks!!! If u can make an similar tut for the nem Flutter version it;s going to be great!!! thks again!!

[@YomenChannel]

Why do you prefer relative imports?

[@vjmathew6962]

the problem i encountered was when i want to change the package name, i had to do the change in every imports

[@AliAhmad-fx3dj]

Really need the course with Null Safety.

[@anassa6737]

class ServerFailure extends Failure { @override // TODO: implement props List get props => throw UnimplementedError(); } can you solver ot plz

[@VandersonRodriguessilva]

Many thanks for that. Well done.

[@anassa6737]

Bad state: No method stub was called from within `when()`. Was a real method called, or perhaps an extension method?

[@flujan987]

amazing, very good job, thanks for sharing

[@MaximoPower2024]

Please give some tips for Null Safety. Libraries equatable, connectivivy and shared_preferences are labelled as legacy.

[@amanpalariya]

Why are we creating classes for *use cases* ? Those classes do nothing but return whatever the functions of the *repository* return. Is it done to make testing easy or will it be helpful if there are complex *use cases* ?

[@uDropper]

When a import presents error just type 'flutter pub add [package name]' in the terminal

[@tareksellami7346]

Thanks a lot for your great work

[@moseskarunia]

what a great tutorial! thanks

[@TirthPatel]

If there is a bottom navigation bar with 4 items then how can I divide them into features? There will be a scaffold that would host the BNV it the first place.

[@luix138]

Hey teacher, I love your videos

[@user-tr6ul3gy2t]

Does it make sense if we have an entity that has a member variable of type of another entity? Or am I doing the architecture incorrectly?

[@eduardorabanal2803]

great video bro, I'm waiting for the next episode

[@ahsanalidev]

you are doing great please keep it up , I am really thankful to you like really !!!! :-)

[@THEMithrandir09]

Why use Either(which I like) over basing the failure on number trivia? Any concrete reasoning on that?

[@pathakvivek7865]

you are awesome. Really quality content.

[@jaboycjava]

I recently watched through some of Uncle Bob's Clean Code videos, and one thing he says seems to contradict what you are doing. In this video, kzbin.info/www/bejne/a2nNeKOMZ6iaa5I, at 1:23:06, someone asks if the test suite should match the folder structure of the production code, and Uncle Bob says it shouldn't (due to coupling), but your test folder seems to match the folder structure of the production code. Can you help me understand whether I misunderstood something or what thoughts you have on this?

[@aytunch]

Matej, what are tests for exactly? I have never done tests before. Do they exist to check if repository feeds our logic methods with un processable data? Or would tests work for UI as well? What could be the benefits?

[@guzidev]

Nice videos, I have a question, What if we have an entity that needs to be called from multiple screens, maybe a game_topscore that can be required in game and top_score screens? We need to create core/domain/entities folder? Thank you

[@RyanHooGeek]

Strange accent, charming voice, great tutorial! Thank you so much.

[@ResoCoder]

Wannabe US accent with Slovak subtones 😄 Thanks for watching!

[@meanwhile8811]

@@ResoCoder no offence but it sounds like you just got a set of new dentures. the fake yank accent be painful 😭⚰️

[@ResoCoder]

It’s not fake lol. I learned to speak English properly by watching a lot of Minecraft let’s plays as a kid mostly recorded by people from the US and Canada.

[@meanwhile8811]

@@ResoCoder fair enough my guy. thanks for the lessons 😘

[@goldcoderscorp1668]

how would you go about using clean architecture on getx package?

[@AimaneNajja]

Failure([List properties = const []]) : super(properties); [[]]; but this makes the test red because the Right-object expects a dynamic in it but a Failure-object is returned.. Please help

[@jeancarloflorescarrasco412]

I'm facing the same error ...

[@AimaneNajja]

For some reason it did not equal them even though the class extend Equatable. So what I did to make the test green was to make one instance for both thenAnswer and expect

[@dawidniegrebecki2205]

Great video!!!

[@bryanbarreto]

17:12 Using an external dependency on Domain doesn't break the rule that domain must not contain external dependecy? Because Domain is the most important layer of the application, and it's named domain because we mut have domain on everything on this layer. And importing DartZ break this rule. There's another solution for that?

[@haidarrmehsen]

Hello first thanks for the excellent explanation I just want to ask does this architecture fit for games developed with flutter as well? waiting for your response

[@yuwenpixon]

What is the call to this architecture? sorry, I'm still confused, what is the difference, compared to other architecture like BLoc, Redux etc?

[@gmc254quads6]

Thank you. Love the architecture and have started learning TDD.