Test for RegionRepository

RegionRepositoryTest.kt

import com.architectcoders.wanago.data.RegionRepository
import com.architectcoders.wanago.data.datasource.LocationDataSource
import com.architectcoders.wanago.domain.PermissionChecker
import com.architectcoders.wanago.domain.PermissionChecker.Permission.COARSE_LOCATION
import kotlinx.coroutines.test.runBlockingTest
import org.junit.Assert.assertEquals
import org.junit.Test
import org.mockito.kotlin.doReturn
import org.mockito.kotlin.mock
import org.mockito.kotlin.verify

class RegionRepositoryTest {

    private val locationDataSource: LocationDataSource = mock()
    private val permissionChecker: PermissionChecker = mock()
    private val regionRepository = RegionRepository(locationDataSource, permissionChecker)

    @Test
    fun `findLastRegion returns default region when location permission is granted but LocationDataSource cannot find last region`() = runBlockingTest {
        doReturn(true).`when`(permissionChecker).check(COARSE_LOCATION)
        doReturn(null).`when`(locationDataSource).findLastRegion()

        val result = regionRepository.findLastRegion()

        assertEquals(RegionRepository.DEFAULT_REGION, result)
        verify(permissionChecker).check(COARSE_LOCATION)
        verify(locationDataSource).findLastRegion()
    }
}