Android test in kotlin of realm

Question

How can be done a simple test of a realm database in Android implementing the test in Kotlin?

I attempted to adapt a fragment from java realm test on github to kotlin and got the next code:

import io.realm.Realm import io.realm.log.RealmLog import org.hamcrest.CoreMatchers import org.junit.Assert import org.junit.Test import org.junit.Before import org.junit.Rule import org.mockito.Mockito.`when` import org.powermock.api.mockito.PowerMockito import org.powermock.modules.junit4.rule.PowerMockRule class DBTest { @Rule var rule = PowerMockRule() lateinit internal var mockRealm: Realm @Before fun setup() { PowerMockito.mockStatic(RealmLog::class.java) PowerMockito.mockStatic(Realm::class.java) val mockRealm = PowerMockito.mock(Realm::class.java) `when`(Realm.getDefaultInstance()).thenReturn(mockRealm) this.mockRealm = mockRealm } @Test fun shouldBeAbleToGetDefaultInstance() { Assert.assertThat(Realm.getDefaultInstance(), CoreMatchers.`is`(mockRealm)) } }

But when I execute the test I get:

org.junit.internal.runners.rules.ValidationError: The @Rule 'rule' must be public.

Community · Accepted Answer · 2017-05-23 12:00:17Z

You can make the getter of the rule public like so:

@get: Rule var rule = PowerMockRule()

Or you can mark it as a Java style field with the @JvmField annotation:

@JvmField @Rule var rule = PowerMockRule()

You can find more details in this answer: https://stackoverflow.com/a/32827600/4465208

Ps. You should also consider making it a val if you don't intend on changing its value anywhere.

Thanks, "@get Rule" fixed the problem. Now I am getting java.lang.NoClassDefFoundError: org/mockito/cglib/proxy/Enhancer but this is another question.

Saeed · Accepted Answer · 2017-10-24 13:30:52Z

Realm java 4.1.0 has been released and most problem of Realm with Kotlin has resolved! . You can test my sample project to see how you must config project or create classes. My sample is for testing module in Realm object Server with kotlin.

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