Testing Navigation with Mockito & Espresso - Testing in Android - Part 13

[@thomasknee7844]

Everytime I get stuck in my Android testing knowledge and I can't find what I'm looking for in the docs, I find a video by you and it helps answer most if not all of my questions, thank you, keep doing what you do :)

[@Alchemist10241]

I was looking for a way to test navigations for a long time and this video explains how to do it in a simplistic manner. Philipp YOU ARE THE BEST 😎. By the way to create a new test class from a class (or switch to an existing test class) just use CTRL + SHIFT + T shortcut key. Thanks a lot.

[@matt-g-recovers]

Love it.
After this bit, I will be extremely comfortable with every aspect of modern professional Android development...
I mean shit I have been doing it since Eclipse in 2009, MVC. SQLiteOpenhelper, crashes, crashes, ANRs.... lol.
Things have come a long way, I can't wait to see how Compose goes!!!
(I put off testing for too long really was the issue why as a Sr developer I am just doing this, I love testing now though )

[@dmytrodolotov9723]

Hi everyone, I've got SecurityException: Writing DEX files are not allowed, when trying to call Mockito's mock() function for navController. Look's like it only happens on Android 14. Any suggestions?

[@ioannistzavaras6873]

Thank you so much, Philipp! Great job! Keep going!

[@PhilippLackner]

Thanks you're welcome! :)

[@nishaaggarwal7876]

@Phillipp Thanks for this awesome video.
But how are you able to test on backPressed from Fragment2 in isolation with Fragment1?

[@samalgerie25]

I have an unrelated question. at 3:30 Phillip used the floating button (fabAddShoppingItem.setOnCli...) without using binding or even findById. Does anyone know how he could do this?

[@daniboy943]

The way he did is deprecated now. Stick to view binding and you'll be fine.

[@akashdeepwadhwa5828]

thank you very much ... for tutorials learnt a lot from you .. i have question after finishing this series..which project from your website i should learn ..to atleast get the job ..

[@panspost609]

since the android studio has the espresso recorder, why not use that recorder to do all those tests automatically?

[@muhammadsarimmehdi]

how would you use this with databinding?

[@ardinalbts3330]

thank you sir.. great explanation

[@junecnol79]

awesome tutorials. thank you again

[@tochukwuokey-munonye7884]

I did the first test but the test for empty curImageUrl is difficult. Someone please help me

[@ochornmapromise257]

@Test
fun pressBackButton_imageUrlSetToEmptyString(){
val testViewModel = ShoppingViewModel(FakeShoppingRepository())
val navController = mock(NavController::class.java)
launchFragmentInHiltContainer {
Navigation.setViewNavController(requireView(), navController)
viewModel = testViewModel
}
pressBack()
val value = testViewModel.curImageUrl.getOrAwaitValue()
assertThat(value).isEmpty()
}

[@quangtruongpham4057]

your tutorial is very helpful . Nice

[@PhilippLackner]

Glad it was helpful!

[@hellosagar]

Awesome Video

[@foivosstamopoulos9709]

Great tutor!! Thank you!!

[@chuka_obi5167]

Thanks for your video Phillip! I learnt a lot from it. How do you test navigation if you have nav args? Would anyvalue work in the navdirections action?

[@PhilippLackner]

The same way, just check that the navigate function was called with the right parameters

[@chuka_obi5167]

@@PhilippLackner Thank you. Will Try that out this night

[@IdaBagusTrisnaWidia]

I tried but failed. Is that caused by using viewbinding? You're using syntetic which is going to be deprecated

[@akashdeepwadhwa5828]

just override oncreate view and return binding.root from there

[@baselnat93]

big thanks

[@mustafaammar551]

Thank you Bro

[@dmytromarchuk3023]

thank you

[@bhavyasharma3500]

Thanks man

[@saumilpatel2480]

How to test null URL? Have you tried?

[@pavesid]

​@@saumilpatel2480 In launchFragment... get reference to viewModel.currentImageUrl, after pressBack() get url using getOrAwaitValue() and then compare with "".

[@saumilpatel2480]

​@@pavesid Can you please put down the code, seems easy but i'm lost. Thank you

[@karimabdelhameed2418]

@@saumilpatel2480 : Hello , Hope this will help you my friend ideone.com/WvAofp , please try it and give me ur feedback, as I'm still not good at testing.

[@karimabdelhameed2418]

@@saumilpatel2480 Edit : I think it was wrong to assign/use the real viewModel instance, and we should use a fakeViewModel like this : ideone.com/UInCNT , I think if u saw the next videos , u will realize this by yourself, hope my answer helped u man!

[@dmytromarchuk3023]

Who is that man who is constantly putting a dislike on every video? :) It's gonna be your hater

[@antoniokomangyudistira4150]

Second

[@akashsaha8357]

Everytime I am getting this error while testing navigation for ShoppingFragment.
java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
Can anyone please help ???

[@akashsaha8357]

Any one if facing the same issue with your device , please keep the device unlocked.

[@siavashparsa5046]

java.lang.AbstractMethodError: abstract method "java.util.List org.mockito.invocation.Invocation.getArgumentsAsMatchers()"
i got this error would you please help me to solve this?

[@ahmedfahimfoysaleishon2097]

You have to remove the following
androidTestImplementation "com.linkedin.dexmaker:dexmaker-mockito:2.12.1"
androidTestImplementation "org.mockito:mockito-core:3.9.0"
and add
androidTestImplementation "org.mockito:mockito-android:3.9.0"

[@dalimhmd]

@@ahmedfahimfoysaleishon2097 Thanks very much bro, this totally works!

[@brunonunes6532]

@@ahmedfahimfoysaleishon2097 probably you dont remenber haha, but this comment saved a lot of my time, thnx bro!

[@ahmedfahimfoysaleishon2097]

@@brunonunes6532 True, I don't remember I left a comment here ;D

[@tochukwuokey-munonye7884]

I did the first test but the test for empty curImageUrl is difficult. Someone please help me