Issue with Realm Unit Test on Android

Question

Using the JUnit4 Test Runner, the test runs and seems to work, but the query returns no results:

@RunWith(AndroidJUnit4::class) class LocationViewInstrumentationTest { @Rule public val mActivityRule: ActivityTestRule<MapsActivity> = ActivityTestRule(MapsActivity::class.java) @Rule var testFolder = TemporaryFolder() @Test fun mapViewIsRendered() { onView(withId(R.id.map)).check(matches(isDisplayed())) } @Test @Throws(IOException::class) fun canSaveLocation() { val tempFolder = testFolder.newFolder("realmdata") val config = RealmConfiguration.Builder(tempFolder).build() val realm = Realm.getInstance(config) realm.beginTransaction() val location = Location("Poppy Manor", 33.2, -121.3, 0.0) assertThat(location, not(nullValue())) realm.commitTransaction() RealmQuery<Location> query = realm.where(Location.class); RealmResults<Location> results = query.findAll(); assertThat(results.size(), equalTo(1)); }

Yes I looked at the example project but do not want to add all the dependencies and want my tests to be readable so trying to avoid all the mocks too.

You didn't write to the Realm in the transaction. Try to add realm.copyToRealm(location) before realm.commitTransaction(). — beeender
– beeender, Commented Mar 28, 2016 at 2:24
Why didn't you put this in as an answer? I used Realm in Swift, just moved to android and did not see those calls. I saw that method but thought it was for resyncing with the session as it were. Thanks! — Rob
– Rob, Commented Mar 28, 2016 at 4:45

beeender · Accepted Answer · 2016-03-29 06:43:53Z

1

You didn't write to the Realm in the transaction. Try to add realm.copyToRealm(location) before realm.commitTransaction().

edited Mar 29, 2016 at 6:43

answered Mar 29, 2016 at 2:17

beeender

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