realm-java: ISSUE - Unit test Problem (librealm-jni.so)

When i want to run this simple unit test :

@RunWith(RobolectricGradleTestRunner.class)
@Config(constants = BuildConfig.class, sdk = 19)
@PowerMockIgnore({"org.mockito.*", "org.robolectric.*", "android.*"})
@PrepareForTest({Realm.class, RealmLog.class})

public class ExampleUnitTest {

    @Rule
    public PowerMockRule rule = new PowerMockRule();
    Realm mockRealm;

    @Before
    public void setup() throws Exception {

        mockStatic(Realm.class);
        mockStatic(RealmLog.class);

        Realm mockRealm = PowerMockito.mock(Realm.class);

        when(Realm.getDefaultInstance()).thenReturn(mockRealm);
        when(Realm.getDefaultInstance()).thenReturn(mockRealm);
        this.mockRealm = mockRealm;
    }

    @Test
    public void shouldBeAbleToGetDefaultInstance() {
        assertThat(Realm.getDefaultInstance(), is(mockRealm));
    }
}

I face this error :

java.lang.UnsatisfiedLinkError: Can't load library: /tmp/android-tmp-robolectric2838690925023503406/app_lib/librealm-jni.so

and indicates to the error line in my class that extends from Application where i init the realm :

Realm.init(getApplicationContext());
        RealmConfiguration realmConfiguration = new RealmConfiguration.Builder().deleteRealmIfMigrationNeeded().build();
        Realm.setDefaultConfiguration(realmConfiguration);

About this issue

Original URL
State: closed
Created 8 years ago
Comments: 33 (18 by maintainers)

Most upvoted comments

I ran into the same / similar issue. After upgrading to Realm 2.x, a lot of robolectic tests failed. The root cause was the Realm.init addition to the Application.

Since I didn’t want to touch any of the tests, I ended up using reflection to make Realm.init think it is already initialized. Setting libraryIsLoaded to true was not enough - it was still causing exceptions.

Thoughts on this approach? For me the above mentioned mock approach with mockStatic/PrepareForTest only worked with PowerMockRule and not with MockitoRule.

Here is the code snippet to fake init Realm.

package io.realm;

import android.content.Context;
import java.lang.reflect.Field;

public class FakeRealmInitForTestEnvironment {

    public static void init(Context context) {
        try {
            Field applicationContext = BaseRealm.class.getDeclaredField("applicationContext");
            applicationContext.set(applicationContext, context);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

thorbenprimke on Nov 22, 2016

@erudonja1 Robolectric claims that they’ve fixed the classloader issue that broke Powermock in your case in 3.3.1

see https://github.com/robolectric/robolectric/issues/2944

Zhuinden on May 24, 2017

Ah, you should create a package named rx, and you should create an empty class inside it called Observable

package rx;

public class Observable {
}

Zhuinden on Nov 21, 2016

The only way to work around it for now is set RealmCore#libraryIsLoaded to true before calling Realm#init(Context) by using reflection.

zaki50 on Nov 17, 2016