RSSuper/android/src/test/java/com/rssuper/viewmodel/FeedViewModelTest.kt

package com.rssuper.viewmodel

import com.rssuper.repository.FeedRepository
import com.rssuper.state.State
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.test.runTest
import org.junit.Before
import org.junit.Test
import org.mockito.Mockito
import org.mockito.Mockito.`when`

class FeedViewModelTest {
    
    private lateinit var feedRepository: FeedRepository
    private lateinit var viewModel: FeedViewModel
    
    @Before
    fun setup() {
        feedRepository = Mockito.mock(FeedRepository::class.java)
        viewModel = FeedViewModel(feedRepository)
    }
    
    @Test
    fun testInitialState() = runTest {
        var stateEmitted = false
        viewModel.feedState.collect { state ->
            assert(state is State.Idle)
            stateEmitted = true
        }
        assert(stateEmitted)
    }
    
    @Test
    fun testLoadFeedItems() = runTest {
        val items = listOf(
            com.rssuper.database.entities.FeedItemEntity(
                id = "1",
                subscriptionId = "sub1",
                title = "Test Item",
                published = java.util.Date()
            )
        )
        
        val stateFlow = MutableStateFlow<State<List<com.rssuper.database.entities.FeedItemEntity>>>(State.Success(items))
        `when`(feedRepository.getFeedItems("sub1")).thenReturn(stateFlow)
        
        viewModel.loadFeedItems("sub1")
        
        var receivedState: State<List<com.rssuper.database.entities.FeedItemEntity>>? = null
        viewModel.feedState.collect { state ->
            receivedState = state
        }
        
        assert(receivedState is State.Success)
        assert((receivedState as State.Success).data == items)
    }
    
    @Test
    fun testMarkAsRead() = runTest {
        `when`(feedRepository.markAsRead("1", true)).thenReturn(1)
        `when`(feedRepository.getUnreadCount("sub1")).thenReturn(5)
        
        viewModel.markAsRead("1", true)
        
        var unreadCountState: State<Int>? = null
        viewModel.unreadCount.collect { state ->
            unreadCountState = state
        }
        
        assert(unreadCountState is State.Success)
        assert((unreadCountState as State.Success).data == 5)
    }
}