java.lang.NoClassDefFoundError:android and junit test

Question

I saw that I'm not the only one having this problem but I don't find a correct answer. I have an android project that I want to test. I create a junit test class for each class of my project. My problem is when I run my test, I have the following error :

java.lang.NoClassDefFoundError: android/content/Context

This is my class test :

public class DevicesBDDTest extends TestCase {

    DevicesBDD bdd;

    /**
     * @throws java.lang.Exception
     */
    protected static void setUpBeforeClass() throws Exception {
    }

    /**
     * @throws java.lang.Exception
     */
    protected static void tearDownAfterClass() throws Exception {
    }

    protected void setUp() throws Exception {
        super.setUp();
        Context ctx = mock(Context.class);
        final MaBaseSQLiteInterface mockMaBaseSQLite = mock(MaBaseSQLiteInterface.class);
        bdd = new DevicesBDD(ctx){
            @Override
            public MaBaseSQLiteInterface createMaBaseSQlite(Context context) {
                return mockMaBaseSQLite;
            }
        };
    }


    protected void tearDown() throws Exception {
        super.tearDown();
    }

    public void test() {
        assertEquals(1, 1);
    }
}

My class DevicesBDD has needs an object Context, therefore I create a mock (with mockito). I tried with a object MockContext too, but it's doesn't work.

This is my Java Build Path :

mockito-all-1.9.5.jar
Android 2.1 -> android.jar
Android Dependencies -> annotations.jar
Junit 3 -> junit.jar

Context may be not available in the classs path, try add its jar file in the class path. also Context is a abstract class, you can extend it in to a anonymous class and use that... give more detail on the error and structure. — Dipak, Jan 08 '13 at 11:57
In build path, I have : - mockito-all-1.9.5.jar - Android 2.1 (with android.jar) - Andoird Dependencies - JUnit3 Normally, the class Context should be on library Android, no? — helene, Jan 08 '13 at 13:42
@user1836315 Are you trying to build android junit, or normal unit test, that you try to run on your workstation? — Boris Strandjev, Jan 08 '13 at 14:11
@BorisStrandjev, Sorry I'm not sure I understand your question. I have an other test class (in the same project) witch test an other simple class which hasn't android object. I can run this test class without problem — helene, Jan 08 '13 at 14:17
@BorisStrandjev, Your question is if I run my class with Junit test or Android Junit test ? For this case, I run with Junit test. If I try to run with Android Junit test, I have the error : java.lang.NoClassDefFoundError: org.mockito.Mockito — helene, Jan 08 '13 at 14:23
@user1836315 usually unit tests of Adnroid applications are meant to be run in a context of android device. This is why the android sdk related classes will not be automatically on your build path when you run ordinary junit tests. Thus `Context` is not recognized — Boris Strandjev, Jan 08 '13 at 14:29
OK. I have succeed to resolve my problem by running as Android Junit test and hadding mockito-all-1.9.5.jar on a folder libs/ on my android test projet. # I have a new error which ma be caused by mockito : java.lang.ExceptionInInitializerError at org.mockito.internal.creation.jmock.ClassImposterizer.createProxyClass(ClassImposterizer.java:85) at org.mockito.internal.creation.jmock.ClassImposterizer.imposterise(ClassImposterizer.java:62) ... — helene, Jan 08 '13 at 15:08

score 87 · Answer 1 · edited Aug 14 '17 at 18:54

87

Not sure if I had the same problem as you but I am using gradle and for some reason the tests just wouldn't run anymore, with the same error as you had. I tried cleaning and rebuilding but to no avail. After hours of frustration and trying to find an answer I came across the simple solution in a GitHub thread:

I resolved this issue by removing the .gradle folder in my project and rebuilding the project.

(thanks to vpetrov)

edited Aug 14 '17 at 18:54

IgorGanapolsky

26,189
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answered Mar 02 '17 at 10:27

LoPoBo

1,767
1
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Perfect. I had this problem after updating to Android Studio 2.3. Removing .gradle/ folder solves the issue. – Nicolás Arias Mar 08 '17 at 22:45
1

OMG. it works. I was almost going to bang my head. Thank you. If some problem comes, first delete .gradle evil file :D – Ajay Shrestha Jun 13 '17 at 01:12
Thanks a bunch my friend – prago Dec 20 '18 at 18:34
3

Just to make it explicit, here's what worked for me: Quit Android Studio, delete .gradle folder, open Android Studio and try again. – Luke Mar 25 '19 at 13:19

score 32 · Answer 2 · answered Mar 22 '17 at 09:20

32

You can run ./gradlew clean test in the terminal.

answered Mar 22 '17 at 09:20

rcde0

4,192
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If you're using Android Studio, you can run this as a gradle task. – Erigami Dec 06 '20 at 00:55

score 20 · Answer 3 · answered Apr 10 '19 at 20:56

20

Fixed the issue by following these steps --

1.Open module level build.gradle file, go to dependencies, go to this line --

testImplementation 'junit:junit:4.12'

2.Change the junit version to anything else below it (like 4.10)

testImplementation 'junit:junit:4.10'

3.Sync project

4.The issue fixed at this point in my case

5.Set the junit version back to what it was before (4.12 in my case) if you want

testImplementation 'junit:junit:4.12'

6.Sync project

Changing the junit version and syncing project worked in my case.

answered Apr 10 '19 at 20:56

Mohit Atray

452
4
15

1

Worked for me. Thanks! – LukeWaggoner May 08 '19 at 18:55
6

Worked for me, but what kind of voodoo is this?? What in the heck? – Kevin Oct 07 '19 at 17:12
did not work for me. was 'junit:junit:4.13' changed 'junit:junit:4.12' synced then back to 'junit:junit:4.13' ran tests but same error – Tajuddin Khandaker Nov 30 '22 at 12:47
@TajuddinKhandaker Try running tests after changing to 4.12 and 4.10. – Mohit Atray Dec 02 '22 at 11:24

Cavitedev · Answer 4 · 2020-11-01T16:14:22.247

0

Robolectric version 4.4 seems not to support jdk 14. So I could switch to jdk 13 or update robolectric to 4.5-alpha-1

edited Nov 01 '20 at 16:14

answered Nov 01 '20 at 15:48

Cavitedev

613
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java.lang.NoClassDefFoundError:android and junit test

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