CODEWITHSUNDEEP
androidandroid-contentproviderjunit4android-instrumentation
Nouvel Travay
Nouvel Travay

Reputation: 6462

Perform instrumentation testing of ContentProvider

Say my ContentProvider is called DogProvider. How do I set up my Instrumentation test skeleton? When I try to run the following, I always end up with a null MockContentResolver.

import org.junit.Test;
import org.junit.runner.RunWith;

import android.content.ContentProvider;
import android.database.Cursor;
import android.net.Uri;
import android.support.test.runner.AndroidJUnit4;
import android.support.test.filters.LargeTest;
import android.test.ProviderTestCase2;
import android.support.test.InstrumentationRegistry;
import android.test.mock.MockContentResolver;

import com.bus.proj.data.DogContract;
import com.bus.proj.data.DogProvider;

@RunWith(AndroidJUnit4.class)
@LargeTest
public class ContentProviderTest extends ProviderTestCase2<DogProvider>{

    public ContentProviderTest() {
        super(DogProvider.class, DogContract.CONTENT_AUTHORITY);
    }

    @Override
    protected void setUp() throws Exception{
        setContext(InstrumentationRegistry.getTargetContext());
        super.setUp();
    }

    @Test
    public void emptyQuery(){
        MockContentResolver contentResolver = getMockContentResolver();
        assertNotNull(contentResolver);//fail happens here
        Uri uri = DogContract.DogEntry.CONTENT_URI;
        Cursor cursor = contentResolver.query(uri,null,null,null,null);
    }

}

Upvotes: 1

Views: 888

Answers (1)

XGouchet
XGouchet

Reputation: 10203

In your test you're using the AndroidJunit4 test runner, which is based on annotation (compared to the JUnit3 which was based on method names).

This means that your setUp method is probably not called. For it to be called before each test, you need to use the @Before annotation, and make your method public : 

@Before
@Override 
public void setUp() throws Exception{
    setContext(InstrumentationRegistry.getTargetContext());
    super.setUp(); 
}

Upvotes: 1

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