Cannot resolve symbol InstantTaskExecutorRule

Question

I open example code BasicRxJavaSample (from this article Room+RxJava) The main thing is there:

@Rule
public InstantTaskExecutorRule instantTaskExecutorRule = 
    new InstantTaskExecutorRule();

And BasicRxJavaSample is all ok. But I can not apply this in my test. That's what's going on:

Cannot resolve symbol InstantTaskExecutorRule

And manual import does not work:

My autocompletion works like this

But should be so

My app build.gradle (full gradle here):

// tests
testImplementation 'junit:junit:4.12'
androidTestCompile "com.android.support:support-annotations:$supportVersion"
testImplementation "android.arch.core:core-testing:$archVersion"
// Test helpers for Room
testImplementation "android.arch.persistence.room:testing:1.0.0"
// https://github.com/mockito/mockito
testImplementation 'org.mockito:mockito-core:2.13.0'
androidTestImplementation 'org.mockito:mockito-android:2.13.0'
// AndroidJUnitRunner and JUnit Rules
androidTestImplementation 'com.android.support.test:rules:1.0.1'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
// https://developer.android.com/topic/libraries/testing-support-library/packages.html
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
androidTestCompile 'com.android.support.test.espresso:espresso-idling-resource:3.0.1'

score 141 · Accepted Answer · edited Jan 02 '20 at 12:15

141

Replace testImplementation by androidTestImplementation. So the tests on folder androidTest can have access to the library.

dependencies {
    androidTestImplementation "androidx.arch.core:core-testing:2.1.0"
}

If you are not using androidx then use android.arch.core:core-testing:1.1.1

edited Jan 02 '20 at 12:15

Sanjeev

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answered Feb 13 '18 at 11:35

Paulo Pereira

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I have made the above changes but this solution didn't work in my case. Is there any other possibility? – Kavita Patil May 07 '19 at 18:58
24

@Kavita_p I changed `androidTestImplementation` to `testImplementation`, then it resolved and worked – Boy Jun 23 '20 at 14:22
2

If doesn't work after provided dependencies. Add manually `import androidx.arch.core.executor.testing.InstantTaskExecutorRule` – Philipp Buhaievskiy Dec 22 '20 at 14:41

Kavita Patil · Answer 2 · 2020-05-03T09:30:24.843

79

I know it's late but I would like to add one thing to this accepted answer.

If you want to use,

@Rule
public InstantTaskExecutorRule instantTaskExecutorRule = 
new InstantTaskExecutorRule();

in your JUnit test case, i.e., in test folder then use following dependency, i.e, with testImplementation

dependencies {
testImplementation "android.arch.core:core-testing:1.0.0"
}

If you want to use InstantTaskExecutorRule for your UI or integration test cases(androidTest folder), use androidTestImplementation. that is:

androidTestImplementation "android.arch.core:core-testing:1.0.0"

And if you want to add for both, use androidTestImplementation & testImplementation that is:

androidTestImplementation "android.arch.core:core-testing:1.0.0"

testImplementation "android.arch.core:core-testing:1.0.0"

For Android-X use below dependency:

androidTestImplementation 'androidx.arch.core:core-testing:2.0.0'

OR

testImplementation 'androidx.arch.core:core-testing:2.0.0'

edited May 03 '20 at 09:30

answered May 10 '19 at 08:14

Kavita Patil

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This shoild be the best answer – Idris Stack May 30 '19 at 21:08
Thanks for pointing out @Kavita_p .... Android is mostly crazy and not developer friendly. testImplementation and androidTestImplementation should be defined if system needs to have dependency in Instrumentation test and Unit test... Wondering, when Google will make all these as developer friendly..!!!! I found IOS development much more developer friendly... these thinks Really Sucks.... – Sreehari Jul 17 '19 at 07:36
1

But if you use implementation, this library code will be present on your release APK. Which is not necessary or correct. If you want use on both, you should use both androidTestImplementation and testImplementation. – Paulo Pereira Jul 24 '19 at 10:45
1

Hi, @PauloPereira thanks for your input. Yes, you are right about including these libs in release APK. I will update my answer as well. – Kavita Patil Jul 26 '19 at 05:00
YES:!!!! for AndroidX use androidTestImplemention (not just testImplementation) – Shimon Rothschild Sep 20 '22 at 09:57

Abhilash Das · Answer 3 · 2019-02-25T14:09:14.313

25

for androidX migration, add

androidTestImplementation "androidx.arch.core:core-testing:2.0.0"

edited Feb 25 '19 at 14:09

answered Feb 04 '19 at 11:22

Abhilash Das

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Latest version info can be found here - https://developer.android.com/jetpack/androidx/releases/lifecycle – Hossain Khan Sep 08 '19 at 14:03

score 7 · Answer 4 · answered May 10 '21 at 07:55

7

dependencies {
    testImplementation "androidx.arch.core:core-testing:2.1.0"
}

answered May 10 '21 at 07:55

Squall Huang

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score 6 · Answer 5 · answered Jan 01 '18 at 11:19

Please put this two dependencies in your gradle file,

dependencies {

    // Test helpers for LiveData
    testImplementation "android.arch.core:core-testing:1.0.0"

    // Test helpers for Room
    testImplementation "android.arch.persistence.room:testing:1.0.0"
}

Further information please go through this link, Android Architecture components integration guide

tim4dev · Answer 6 · 2018-02-24T11:06:08.240

1

I think that there is a conflict in some of the linked libraries. I got around this, I used blockingGet() and blockingFirst().

and, in the end, I used https://developer.android.com/training/testing/junit-runner.html#using-android-test-orchestrator

androidTestUtil 'com.android.support.test:orchestrator:1.0.1'

this is what you need!

edited Feb 24 '18 at 11:06

answered Jan 01 '18 at 17:02

tim4dev

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score 1 · Answer 7 · answered Apr 22 '19 at 22:53

1

Sometimes test dependency issues can be an issue of selecting the appropriate build variant, depending on your Gradle configuration. In my case, tests are configured for the debug build variant only.

answered Apr 22 '19 at 22:53

caitcoo0odes

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score 0 · Answer 8 · answered Nov 15 '22 at 06:32

0

Changing from 'androidTestImplementation 'androidx.arch.core:core-testing:1.0.0' to 2.0.0 somehow magically solved my problem.

Guessing it's because I use androidX.

answered Nov 15 '22 at 06:32

Kathy Lo

1

This does not provide an answer to the question. Once you have sufficient [reputation](https://stackoverflow.com/help/whats-reputation) you will be able to [comment on any post](https://stackoverflow.com/help/privileges/comment); instead, [provide answers that don't require clarification from the asker](https://meta.stackexchange.com/questions/214173/why-do-i-need-50-reputation-to-comment-what-can-i-do-instead). - [From Review](/review/late-answers/33184788) – IRTFM Nov 21 '22 at 23:22

Svape · Answer 9 · 2023-01-06T01:42:06.920

0

In my case, I use like that.

implementation 'androidx.arch.core:core-testing:2.1.0'

Changing testImplementation for implementation.

I am using Android Studio Dolphin | 2021.3.1 Patch 1.

edited Jan 06 '23 at 01:42

answered Jan 06 '23 at 01:40

Svape

1
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Cannot resolve symbol InstantTaskExecutorRule

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