Android instrumented test no tests found

Question

I am new to Android instrumented unit tests. I have a simple test that looks like this. This is in instrumented tests; before I really write an actual instrumented test, I just want to test a simple one:

@RunWith(AndroidJUnit4.class)
@SmallTest
public class AddressBookKeepingInstrumentedTest {


    public static final String TEST_STRING = "This is a string";
    public static final long TEST_LONG = 12345678L;

    @Test
    public void test_simple() {
        assertEquals(2,1+1);
    }
}

When I run this, I get the following error:

junit.framework.AssertionFailedError: No tests found in com.example.myfirstapp.AddressBookKeepingInstrumentedTest
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:191)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:176)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:554)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1729)

Tests ran to completion.

Gradle build passed with success before this. Any ideas why this is happening?

Have you put this class in this path app/src/androidTest/java/. ? Because I am able to run the test case sucessfully — pooja, Aug 31 '16 at 05:54
Relevant question related to AndroidX: https://stackoverflow.com/questions/53600222/no-tests-found-when-running-instrumented-tests-with-androidx — Alexandre, Sep 06 '19 at 21:15

score 34 · Accepted Answer · edited May 13 '23 at 02:09

34

Please add the following into your build.gradle and put your test classes into androidTest folder:

android {
    defaultConfig {
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
}

For AndroidX projects you should use:

testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

edited May 13 '23 at 02:09

user16217248

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answered Aug 31 '16 at 06:13

Long Ranger

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The classes are in the right folder. I added what you said, now I get another error:Test running failed: Unable to find instrumentation info for: ComponentInfo{com.example.myfirstapp.test/android.support.test.runner.AndroidJUnitRunner} Empty test suite. What test suite is it talking about? I didn't create one. – Serban Stoenescu Sep 01 '16 at 08:09
Actually, the answer in this question helped further: http://stackoverflow.com/questions/39241640/android-instrumented-test-no-tests-found/39241996#39241996 – Serban Stoenescu Sep 01 '16 at 08:13
1

Can this be helpful ? http://stackoverflow.com/questions/29930597/android-studio-espresso-testing-error-empty-test-suite I did not have the same error as you when I created a simple hello world project with your class. I can run it successfully. – Long Ranger Sep 01 '16 at 08:20
Yes, that is actually what I did. I posted the wrong link in the comment. Thanks. Yes, it helped! – Serban Stoenescu Sep 01 '16 at 08:44
https://stackoverflow.com/questions/9476968/could-not-be-found-or-has-no-tests-in-junit/46556983#46556983 – Imeshke Oct 17 '17 at 05:24
See @whla's answer for AndroidX – E.M. Aug 04 '22 at 18:52

whla · Answer 2 · 2020-02-14T00:02:38.523

15

I recently tried the accepted answer, but it gave me a process crash error when trying to run. If you get this you should use:

testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

Source: Instrumentation run failed due to 'Process crashed.'

edited Feb 14 '20 at 00:02

answered Feb 12 '20 at 00:57

whla

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score 3 · Answer 3 · answered May 30 '20 at 21:39

The typical cause of this can be seen as an exception in Logcat.

I had a specific issue regarding an instrumented multidex run on < API 21, I had to both install MultiDex on a subclass of androidx.test.runner.AndroidJUnitRunner, and override:

AndroidJUnitRunner::createTestRequestBuilder
TestRequestBuilder::createClassPathScanner
ClassPathScanner::getClassPathEntries with the implementation as:
- Unzip and extract the dex files from the APK
- Run dexlib2 to obtain the type names.
- Convert from the type names to a readable format: Ljava/lang/String; -> java.lang.string

This is because ClassPathScanner uses dalvik.system.DexFile, which on API 16, only reads APKs, and then only reads classes.dex

score 2 · Answer 4 · answered Oct 13 '20 at 21:50

2

Another reason to get this error message is when you have an Android App implemented with Java and test cases implemented with Kotlin. If that is the case, be sure you have the following lines in your gradle file:

apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

answered Oct 13 '20 at 21:50

RobertoAllende

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Which gradle file? Also the syntax has changed, and I think the ids as well. – Mister Smith Aug 22 '22 at 12:29

score 1 · Answer 5 · edited May 23 '17 at 12:25

1

This post helped me, just rename your tests methods with "test...", like testMethod()

edited May 23 '17 at 12:25

Community

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answered Mar 28 '17 at 20:18

Pablo Delgado

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score 0 · Answer 6 · answered Aug 22 '22 at 12:43

Make sure you added the correct dependencies in the app's build.gradle file:

    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

The Expresso one is required for any instrumented test even if you don't use it.

Android instrumented test no tests found

6 Answers6

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