feat(creator): 라이브 탭 ViewModel을 추가한다

app/src/main/java/kr/co/vividnext/sodalive/di/AppDI.kt

@@ -179,6 +179,7 @@ import kr.co.vividnext.sodalive.user.signup.SignUpViewModel
 import kr.co.vividnext.sodalive.v2.creator.channel.CreatorChannelHomeViewModel
 import kr.co.vividnext.sodalive.v2.creator.channel.data.CreatorChannelApi
 import kr.co.vividnext.sodalive.v2.creator.channel.data.CreatorChannelRepository
+import kr.co.vividnext.sodalive.v2.creator.channel.live.CreatorChannelLiveViewModel
 import kr.co.vividnext.sodalive.v2.main.MainV2ViewModel
 import kr.co.vividnext.sodalive.v2.main.chat.ChatMainViewModel
 import kr.co.vividnext.sodalive.v2.main.chat.data.ChatRoomApi
@@ -409,6 +410,7 @@ class AppDI(private val context: Context, isDebugMode: Boolean) {
         viewModel { HomeCreatorRankingViewModel(get()) }
         viewModel { HomeRecommendationViewModel(get()) }
         viewModel { CreatorChannelHomeViewModel(get()) }
+        viewModel { CreatorChannelLiveViewModel(get()) }
         viewModel { PushNotificationListViewModel(get()) }
         viewModel { CharacterTabViewModel(get()) }
         viewModel { CharacterDetailViewModel(get()) }

app/src/main/java/kr/co/vividnext/sodalive/v2/creator/channel/live/CreatorChannelLiveViewModel.kt

@@ -0,0 +1,165 @@
+package kr.co.vividnext.sodalive.v2.creator.channel.live
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import com.orhanobut.logger.Logger
+import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers
+import io.reactivex.rxjava3.schedulers.Schedulers
+import kr.co.vividnext.sodalive.base.BaseViewModel
+import kr.co.vividnext.sodalive.common.ApiResponse
+import kr.co.vividnext.sodalive.common.SharedPreferenceManager
+import kr.co.vividnext.sodalive.v2.common.data.ContentSort
+import kr.co.vividnext.sodalive.v2.creator.channel.data.CreatorChannelAudioContentResponse
+import kr.co.vividnext.sodalive.v2.creator.channel.data.CreatorChannelLiveResponse
+import kr.co.vividnext.sodalive.v2.creator.channel.data.CreatorChannelRepository
+import kr.co.vividnext.sodalive.v2.creator.channel.live.data.CreatorChannelLiveTabResponse
+
+class CreatorChannelLiveViewModel(
+    private val repository: CreatorChannelRepository
+) : BaseViewModel() {
+
+    private val _liveStateLiveData = MutableLiveData<CreatorChannelLiveUiState>()
+    val liveStateLiveData: LiveData<CreatorChannelLiveUiState>
+        get() = _liveStateLiveData
+
+    private var creatorId: Long = 0L
+    private var selectedSort: ContentSort = ContentSort.LATEST
+    private var requestGeneration: Int = 0
+
+    fun loadLive(creatorId: Long) {
+        if (creatorId <= 0) return
+        if (this.creatorId == creatorId && _liveStateLiveData.value != null) return
+
+        this.creatorId = creatorId
+        loadFirstPage(selectedSort)
+    }
+
+    fun changeSort(sort: ContentSort) {
+        if (sort == selectedSort) return
+        if (creatorId <= 0) return
+
+        selectedSort = sort
+        loadFirstPage(sort)
+    }
+
+    fun retryLive() {
+        if (creatorId <= 0) return
+
+        loadFirstPage(selectedSort)
+    }
+
+    fun loadMore() {
+        val content = _liveStateLiveData.value as? CreatorChannelLiveUiState.Content ?: return
+        if (!content.hasNext || content.isLoadingMore || creatorId <= 0) return
+
+        val generation = requestGeneration
+        _liveStateLiveData.value = content.copy(isLoadingMore = true, paginationErrorMessage = null)
+        requestLive(page = content.page + 1, sort = content.selectedSort, generation = generation) { response ->
+            val data = response.data
+            val current = _liveStateLiveData.value as? CreatorChannelLiveUiState.Content ?: content
+            if (response.success && data != null) {
+                _liveStateLiveData.value = data.toContentState(
+                    liveReplayContents = current.liveReplayContents + data.liveReplayContents,
+                    isLoadingMore = false
+                )
+            } else {
+                _liveStateLiveData.value = current.copy(
+                    isLoadingMore = false,
+                    paginationErrorMessage = response.message
+                )
+            }
+        }
+    }
+
+    private fun loadFirstPage(sort: ContentSort) {
+        val generation = ++requestGeneration
+        _liveStateLiveData.value = CreatorChannelLiveUiState.Loading
+        requestLive(page = FIRST_PAGE, sort = sort, generation = generation) { response ->
+            val data = response.data
+            if (response.success && data != null) {
+                _liveStateLiveData.value = if (data.currentLive == null && data.liveReplayContents.isEmpty()) {
+                    CreatorChannelLiveUiState.Empty
+                } else {
+                    data.toContentState(liveReplayContents = data.liveReplayContents)
+                }
+            } else {
+                _liveStateLiveData.value = CreatorChannelLiveUiState.Error(response.message)
+            }
+        }
+    }
+
+    private fun requestLive(
+        page: Int,
+        sort: ContentSort,
+        generation: Int,
+        onSuccess: (ApiResponse<CreatorChannelLiveTabResponse>) -> Unit
+    ) {
+        compositeDisposable.add(
+            repository.getLive(
+                creatorId = creatorId,
+                page = page,
+                size = DEFAULT_PAGE_SIZE,
+                sort = sort,
+                token = authToken()
+            )
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(
+                    {
+                        if (generation == requestGeneration) {
+                            onSuccess(it)
+                        }
+                    },
+                    {
+                        if (generation != requestGeneration) return@subscribe
+
+                        it.message?.let { message -> Logger.e(message) }
+                        val current = _liveStateLiveData.value as? CreatorChannelLiveUiState.Content
+                        _liveStateLiveData.value = if (current != null && page > FIRST_PAGE) {
+                            current.copy(isLoadingMore = false, paginationErrorMessage = it.message)
+                        } else {
+                            CreatorChannelLiveUiState.Error(it.message)
+                        }
+                    }
+                )
+        )
+    }
+
+    private fun CreatorChannelLiveTabResponse.toContentState(
+        liveReplayContents: List<CreatorChannelAudioContentResponse>,
+        isLoadingMore: Boolean = false
+    ) = CreatorChannelLiveUiState.Content(
+        liveReplayContentCount = liveReplayContentCount,
+        currentLive = currentLive,
+        liveReplayContents = liveReplayContents,
+        selectedSort = sort,
+        page = page,
+        size = size,
+        hasNext = hasNext,
+        isLoadingMore = isLoadingMore
+    )
+
+    private fun authToken(): String = "Bearer ${SharedPreferenceManager.token}"
+
+    companion object {
+        const val DEFAULT_PAGE_SIZE = 10
+        private const val FIRST_PAGE = 0
+    }
+}
+
+sealed interface CreatorChannelLiveUiState {
+    data object Loading : CreatorChannelLiveUiState
+    data object Empty : CreatorChannelLiveUiState
+    data class Error(val message: String?) : CreatorChannelLiveUiState
+    data class Content(
+        val liveReplayContentCount: Int,
+        val currentLive: CreatorChannelLiveResponse?,
+        val liveReplayContents: List<CreatorChannelAudioContentResponse>,
+        val selectedSort: ContentSort,
+        val page: Int,
+        val size: Int,
+        val hasNext: Boolean,
+        val isLoadingMore: Boolean = false,
+        val paginationErrorMessage: String? = null
+    ) : CreatorChannelLiveUiState
+}

app/src/test/java/kr/co/vividnext/sodalive/v2/creator/channel/live/CreatorChannelLivePaginationTest.kt

@@ -0,0 +1,219 @@
+package kr.co.vividnext.sodalive.v2.creator.channel.live
+
+import android.app.Application
+import android.content.Context
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.Observer
+import androidx.test.core.app.ApplicationProvider
+import io.reactivex.rxjava3.android.plugins.RxAndroidPlugins
+import io.reactivex.rxjava3.core.Scheduler
+import io.reactivex.rxjava3.core.Single
+import io.reactivex.rxjava3.plugins.RxJavaPlugins
+import io.reactivex.rxjava3.schedulers.Schedulers
+import io.reactivex.rxjava3.subjects.SingleSubject
+import kr.co.vividnext.sodalive.common.ApiResponse
+import kr.co.vividnext.sodalive.common.SharedPreferenceManager
+import kr.co.vividnext.sodalive.v2.common.data.ContentSort
+import kr.co.vividnext.sodalive.v2.creator.channel.data.CreatorChannelAudioContentResponse
+import kr.co.vividnext.sodalive.v2.creator.channel.data.CreatorChannelRepository
+import kr.co.vividnext.sodalive.v2.creator.channel.live.data.CreatorChannelLiveTabResponse
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.kotlin.times
+import org.mockito.kotlin.verify
+import org.mockito.kotlin.whenever
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+
+@RunWith(RobolectricTestRunner::class)
+@Config(sdk = [28], application = Application::class)
+class CreatorChannelLivePaginationTest {
+
+    private val context: Context = ApplicationProvider.getApplicationContext()
+    private lateinit var repository: CreatorChannelRepository
+    private lateinit var viewModel: CreatorChannelLiveViewModel
+
+    @Before
+    fun setUp() {
+        setImmediateRxSchedulers()
+        SharedPreferenceManager.resetForTest()
+        SharedPreferenceManager.init(context)
+        SharedPreferenceManager.token = "test-token"
+        repository = org.mockito.kotlin.mock()
+        viewModel = CreatorChannelLiveViewModel(repository)
+    }
+
+    @After
+    fun tearDown() {
+        RxJavaPlugins.reset()
+        RxAndroidPlugins.reset()
+        SharedPreferenceManager.resetForTest()
+    }
+
+    @Test
+    fun `hasNext가 true이면 다음 페이지는 마지막 성공 응답의 page plus 1로 요청하고 append한다`() {
+        stubGetLive(
+            page = 0,
+            response = Single.just(ApiResponse(true, liveResponse(page = 0, ids = listOf(1L), hasNext = true), null))
+        )
+        stubGetLive(
+            page = 1,
+            response = Single.just(ApiResponse(true, liveResponse(page = 1, ids = listOf(2L), hasNext = false), null))
+        )
+        viewModel.loadLive(100L)
+
+        viewModel.loadMore()
+
+        val state = viewModel.liveStateLiveData.requireValue() as CreatorChannelLiveUiState.Content
+        assertEquals(1, state.page)
+        assertEquals(listOf(1L, 2L), state.liveReplayContents.map { it.audioContentId })
+        assertFalse(state.hasNext)
+        verifyGetLive(page = 1)
+    }
+
+    @Test
+    fun `다음 페이지 로딩 중 중복 load-more 요청은 막는다`() {
+        val pending = SingleSubject.create<ApiResponse<CreatorChannelLiveTabResponse>>()
+        stubGetLive(
+            page = 0,
+            response = Single.just(ApiResponse(true, liveResponse(page = 0, ids = listOf(1L), hasNext = true), null))
+        )
+        stubGetLive(page = 1, response = pending)
+        viewModel.loadLive(100L)
+
+        viewModel.loadMore()
+        viewModel.loadMore()
+
+        val loadingState = viewModel.liveStateLiveData.requireValue() as CreatorChannelLiveUiState.Content
+        assertTrue(loadingState.isLoadingMore)
+        verifyGetLive(page = 1, times = 1)
+        pending.onSuccess(ApiResponse(true, liveResponse(page = 1, ids = listOf(2L), hasNext = false), null))
+        val loadedState = viewModel.liveStateLiveData.requireValue() as CreatorChannelLiveUiState.Content
+        assertEquals(listOf(1L, 2L), loadedState.liveReplayContents.map { it.audioContentId })
+    }
+
+    @Test
+    fun `다음 페이지 실패는 기존 목록을 유지하고 pagination error를 표시한다`() {
+        stubGetLive(
+            page = 0,
+            response = Single.just(ApiResponse(true, liveResponse(page = 0, ids = listOf(1L), hasNext = true), null))
+        )
+        stubGetLive(page = 1, response = Single.just(ApiResponse(false, null, "failed")))
+        viewModel.loadLive(100L)
+
+        viewModel.loadMore()
+
+        val state = viewModel.liveStateLiveData.requireValue() as CreatorChannelLiveUiState.Content
+        assertEquals(listOf(1L), state.liveReplayContents.map { it.audioContentId })
+        assertFalse(state.isLoadingMore)
+        assertEquals("failed", state.paginationErrorMessage)
+    }
+
+    @Test
+    fun `이전 load-more 응답은 이후 정렬 변경 목록에 append되지 않는다`() {
+        val nextPagePending = SingleSubject.create<ApiResponse<CreatorChannelLiveTabResponse>>()
+        stubGetLive(
+            page = 0,
+            response = Single.just(ApiResponse(true, liveResponse(page = 0, ids = listOf(1L), hasNext = true), null))
+        )
+        stubGetLive(page = 1, response = nextPagePending)
+        stubGetLive(
+            page = 0,
+            sort = ContentSort.POPULAR,
+            response = Single.just(
+                ApiResponse(
+                    true,
+                    liveResponse(page = 0, sort = ContentSort.POPULAR, ids = listOf(10L), hasNext = false),
+                    null
+                )
+            )
+        )
+        viewModel.loadLive(100L)
+
+        viewModel.loadMore()
+        viewModel.changeSort(ContentSort.POPULAR)
+        nextPagePending.onSuccess(ApiResponse(true, liveResponse(page = 1, ids = listOf(2L), hasNext = false), null))
+
+        val state = viewModel.liveStateLiveData.requireValue() as CreatorChannelLiveUiState.Content
+        assertEquals(ContentSort.POPULAR, state.selectedSort)
+        assertEquals(listOf(10L), state.liveReplayContents.map { it.audioContentId })
+    }
+
+    private fun stubGetLive(
+        page: Int,
+        sort: ContentSort = ContentSort.LATEST,
+        response: Single<ApiResponse<CreatorChannelLiveTabResponse>>
+    ) {
+        whenever(
+            repository.getLive(
+                100L,
+                page,
+                CreatorChannelLiveViewModel.DEFAULT_PAGE_SIZE,
+                sort,
+                "Bearer test-token"
+            )
+        ).thenReturn(response)
+    }
+
+    private fun verifyGetLive(
+        page: Int,
+        sort: ContentSort = ContentSort.LATEST,
+        times: Int? = null
+    ) {
+        val verification = times?.let { verify(repository, times(it)) } ?: verify(repository)
+        verification.getLive(
+            100L,
+            page,
+            CreatorChannelLiveViewModel.DEFAULT_PAGE_SIZE,
+            sort,
+            "Bearer test-token"
+        )
+    }
+
+    private fun setImmediateRxSchedulers() {
+        val trampoline = { _: Scheduler -> Schedulers.trampoline() }
+        RxJavaPlugins.setIoSchedulerHandler(trampoline)
+        RxAndroidPlugins.setInitMainThreadSchedulerHandler { Schedulers.trampoline() }
+        RxAndroidPlugins.setMainThreadSchedulerHandler { Schedulers.trampoline() }
+    }
+
+    private fun liveResponse(
+        page: Int,
+        sort: ContentSort = ContentSort.LATEST,
+        ids: List<Long>,
+        hasNext: Boolean
+    ) = CreatorChannelLiveTabResponse(
+        liveReplayContentCount = ids.size,
+        currentLive = null,
+        liveReplayContents = ids.map { audioContent(it) },
+        sort = sort,
+        page = page,
+        size = CreatorChannelLiveViewModel.DEFAULT_PAGE_SIZE,
+        hasNext = hasNext
+    )
+
+    private fun audioContent(id: Long) = CreatorChannelAudioContentResponse(
+        audioContentId = id,
+        title = "다시듣기 $id",
+        duration = null,
+        imageUrl = null,
+        price = 0,
+        isPointAvailable = true,
+        isFirstContent = false,
+        seriesName = null,
+        isOriginalSeries = null
+    )
+
+    private fun <T> LiveData<T>.requireValue(): T? {
+        var value: T? = null
+        val observer = Observer<T> { value = it }
+        observeForever(observer)
+        removeObserver(observer)
+        return value
+    }
+}

app/src/test/java/kr/co/vividnext/sodalive/v2/creator/channel/live/CreatorChannelLiveViewModelTest.kt

@@ -0,0 +1,319 @@
+package kr.co.vividnext.sodalive.v2.creator.channel.live
+
+import android.app.Application
+import android.content.Context
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.Observer
+import androidx.test.core.app.ApplicationProvider
+import io.reactivex.rxjava3.android.plugins.RxAndroidPlugins
+import io.reactivex.rxjava3.core.Scheduler
+import io.reactivex.rxjava3.core.Single
+import io.reactivex.rxjava3.plugins.RxJavaPlugins
+import io.reactivex.rxjava3.schedulers.Schedulers
+import io.reactivex.rxjava3.subjects.SingleSubject
+import kr.co.vividnext.sodalive.common.ApiResponse
+import kr.co.vividnext.sodalive.common.SharedPreferenceManager
+import kr.co.vividnext.sodalive.v2.common.data.ContentSort
+import kr.co.vividnext.sodalive.v2.creator.channel.data.CreatorChannelAudioContentResponse
+import kr.co.vividnext.sodalive.v2.creator.channel.data.CreatorChannelLiveResponse
+import kr.co.vividnext.sodalive.v2.creator.channel.data.CreatorChannelRepository
+import kr.co.vividnext.sodalive.v2.creator.channel.live.data.CreatorChannelLiveTabResponse
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.kotlin.any
+import org.mockito.kotlin.never
+import org.mockito.kotlin.times
+import org.mockito.kotlin.verify
+import org.mockito.kotlin.whenever
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+
+@RunWith(RobolectricTestRunner::class)
+@Config(sdk = [28], application = Application::class)
+class CreatorChannelLiveViewModelTest {
+
+    private val context: Context = ApplicationProvider.getApplicationContext()
+    private lateinit var repository: CreatorChannelRepository
+    private lateinit var viewModel: CreatorChannelLiveViewModel
+
+    @Before
+    fun setUp() {
+        setImmediateRxSchedulers()
+        SharedPreferenceManager.resetForTest()
+        SharedPreferenceManager.init(context)
+        SharedPreferenceManager.token = "test-token"
+        repository = org.mockito.kotlin.mock()
+        viewModel = CreatorChannelLiveViewModel(repository)
+    }
+
+    @After
+    fun tearDown() {
+        RxJavaPlugins.reset()
+        RxAndroidPlugins.reset()
+        SharedPreferenceManager.resetForTest()
+    }
+
+    @Test
+    fun `최초 로드는 page 0과 최신순으로 라이브 API를 호출하고 Content를 emit한다`() {
+        stubGetLive(
+            page = 0,
+            response = Single.just(ApiResponse(true, liveResponse(page = 0, sort = ContentSort.LATEST), null))
+        )
+
+        viewModel.loadLive(100L)
+
+        val state = viewModel.liveStateLiveData.requireValue() as CreatorChannelLiveUiState.Content
+        assertEquals(ContentSort.LATEST, state.selectedSort)
+        assertEquals(0, state.page)
+        assertEquals(listOf(1L), state.liveReplayContents.map { it.audioContentId })
+        verifyGetLive(page = 0)
+    }
+
+    @Test
+    fun `같은 정렬을 다시 선택하면 API를 재호출하지 않는다`() {
+        stubGetLive(
+            page = 0,
+            response = Single.just(ApiResponse(true, liveResponse(page = 0, sort = ContentSort.LATEST), null))
+        )
+        viewModel.loadLive(100L)
+
+        viewModel.changeSort(ContentSort.LATEST)
+
+        verifyGetLive(page = 0, times = 1)
+    }
+
+    @Test
+    fun `정렬 변경은 목록과 page를 초기화하고 첫 페이지를 다시 로드한다`() {
+        stubGetLive(
+            page = 0,
+            response = Single.just(
+                ApiResponse(true, liveResponse(page = 0, sort = ContentSort.LATEST, ids = listOf(1L)), null)
+            )
+        )
+        stubGetLive(
+            page = 0,
+            sort = ContentSort.POPULAR,
+            response = Single.just(
+                ApiResponse(true, liveResponse(page = 0, sort = ContentSort.POPULAR, ids = listOf(10L)), null)
+            )
+        )
+        viewModel.loadLive(100L)
+
+        viewModel.changeSort(ContentSort.POPULAR)
+
+        val state = viewModel.liveStateLiveData.requireValue() as CreatorChannelLiveUiState.Content
+        assertEquals(ContentSort.POPULAR, state.selectedSort)
+        assertEquals(0, state.page)
+        assertEquals(listOf(10L), state.liveReplayContents.map { it.audioContentId })
+        verifyGetLive(page = 0, sort = ContentSort.POPULAR)
+    }
+
+    @Test
+    fun `라이브 API failure는 Error를 emit한다`() {
+        stubGetLive(page = 0, response = Single.just(ApiResponse(false, null, "failed")))
+
+        viewModel.loadLive(100L)
+
+        assertTrue(viewModel.liveStateLiveData.requireValue() is CreatorChannelLiveUiState.Error)
+    }
+
+    @Test
+    fun `Error 상태에서 retryLive를 호출하면 같은 creatorId 첫 페이지를 재시도한다`() {
+        whenever(
+            repository.getLive(
+                100L,
+                0,
+                CreatorChannelLiveViewModel.DEFAULT_PAGE_SIZE,
+                ContentSort.LATEST,
+                "Bearer test-token"
+            )
+        ).thenReturn(
+            Single.just(ApiResponse(false, null, "failed")),
+            Single.just(ApiResponse(true, liveResponse(page = 0, sort = ContentSort.LATEST, ids = listOf(1L)), null))
+        )
+        viewModel.loadLive(100L)
+
+        viewModel.retryLive()
+
+        val state = viewModel.liveStateLiveData.requireValue() as CreatorChannelLiveUiState.Content
+        assertEquals(listOf(1L), state.liveReplayContents.map { it.audioContentId })
+        verifyGetLive(page = 0, times = 2)
+    }
+
+    @Test
+    fun `현재 라이브와 다시듣기 목록이 모두 없으면 Empty를 emit한다`() {
+        stubGetLive(
+            page = 0,
+            response = Single.just(ApiResponse(true, liveResponse(page = 0, currentLive = null, ids = emptyList()), null))
+        )
+
+        viewModel.loadLive(100L)
+
+        assertTrue(viewModel.liveStateLiveData.requireValue() is CreatorChannelLiveUiState.Empty)
+    }
+
+    @Test
+    fun `creatorId가 0 이하이면 라이브 API를 호출하지 않는다`() {
+        viewModel.loadLive(0L)
+
+        verify(repository, never()).getLive(any(), any(), any(), any(), any())
+    }
+
+    @Test
+    fun `최초 로드 전 정렬 변경은 기본 최신순 최초 로드 계약을 바꾸지 않는다`() {
+        stubGetLive(
+            page = 0,
+            response = Single.just(ApiResponse(true, liveResponse(page = 0, sort = ContentSort.LATEST), null))
+        )
+
+        viewModel.changeSort(ContentSort.POPULAR)
+        viewModel.loadLive(100L)
+
+        val state = viewModel.liveStateLiveData.requireValue() as CreatorChannelLiveUiState.Content
+        assertEquals(ContentSort.LATEST, state.selectedSort)
+        verifyGetLive(page = 0)
+        verify(repository, never()).getLive(
+            100L,
+            0,
+            CreatorChannelLiveViewModel.DEFAULT_PAGE_SIZE,
+            ContentSort.POPULAR,
+            "Bearer test-token"
+        )
+    }
+
+    @Test
+    fun `이전 첫 페이지 응답은 이후 정렬 변경 결과를 덮어쓰지 않는다`() {
+        val latestPending = SingleSubject.create<ApiResponse<CreatorChannelLiveTabResponse>>()
+        val popularPending = SingleSubject.create<ApiResponse<CreatorChannelLiveTabResponse>>()
+        stubGetLive(page = 0, response = latestPending)
+        stubGetLive(page = 0, sort = ContentSort.POPULAR, response = popularPending)
+
+        viewModel.loadLive(100L)
+        viewModel.changeSort(ContentSort.POPULAR)
+        popularPending.onSuccess(ApiResponse(true, liveResponse(page = 0, sort = ContentSort.POPULAR, ids = listOf(10L)), null))
+        latestPending.onSuccess(ApiResponse(true, liveResponse(page = 0, sort = ContentSort.LATEST, ids = listOf(1L)), null))
+
+        val state = viewModel.liveStateLiveData.requireValue() as CreatorChannelLiveUiState.Content
+        assertEquals(ContentSort.POPULAR, state.selectedSort)
+        assertEquals(listOf(10L), state.liveReplayContents.map { it.audioContentId })
+    }
+
+    @Test
+    fun `같은 creatorId로 다시 loadLive를 호출하면 기존 상태를 유지하고 API를 재호출하지 않는다`() {
+        stubGetLive(
+            page = 0,
+            response = Single.just(
+                ApiResponse(
+                    true,
+                    liveResponse(page = 0, sort = ContentSort.LATEST, ids = listOf(1L), hasNext = true),
+                    null
+                )
+            )
+        )
+        stubGetLive(
+            page = 1,
+            response = Single.just(
+                ApiResponse(
+                    true,
+                    liveResponse(page = 1, sort = ContentSort.LATEST, ids = listOf(2L), hasNext = false),
+                    null
+                )
+            )
+        )
+        viewModel.loadLive(100L)
+        viewModel.loadMore()
+
+        viewModel.loadLive(100L)
+
+        val state = viewModel.liveStateLiveData.requireValue() as CreatorChannelLiveUiState.Content
+        assertEquals(1, state.page)
+        assertEquals(listOf(1L, 2L), state.liveReplayContents.map { it.audioContentId })
+        verifyGetLive(page = 0, times = 1)
+        verifyGetLive(page = 1, times = 1)
+    }
+
+    private fun stubGetLive(
+        page: Int,
+        sort: ContentSort = ContentSort.LATEST,
+        response: Single<ApiResponse<CreatorChannelLiveTabResponse>>
+    ) {
+        whenever(
+            repository.getLive(
+                100L,
+                page,
+                CreatorChannelLiveViewModel.DEFAULT_PAGE_SIZE,
+                sort,
+                "Bearer test-token"
+            )
+        ).thenReturn(response)
+    }
+
+    private fun verifyGetLive(
+        page: Int,
+        sort: ContentSort = ContentSort.LATEST,
+        times: Int? = null
+    ) {
+        val verification = times?.let { verify(repository, times(it)) } ?: verify(repository)
+        verification.getLive(
+            100L,
+            page,
+            CreatorChannelLiveViewModel.DEFAULT_PAGE_SIZE,
+            sort,
+            "Bearer test-token"
+        )
+    }
+
+    private fun setImmediateRxSchedulers() {
+        val trampoline = { _: Scheduler -> Schedulers.trampoline() }
+        RxJavaPlugins.setIoSchedulerHandler(trampoline)
+        RxAndroidPlugins.setInitMainThreadSchedulerHandler { Schedulers.trampoline() }
+        RxAndroidPlugins.setMainThreadSchedulerHandler { Schedulers.trampoline() }
+    }
+
+    private fun liveResponse(
+        page: Int,
+        sort: ContentSort = ContentSort.LATEST,
+        currentLive: CreatorChannelLiveResponse? = CreatorChannelLiveResponse(
+            1L,
+            "라이브",
+            null,
+            "2026-06-11T12:00:00Z",
+            0,
+            false
+        ),
+        ids: List<Long> = listOf(1L),
+        hasNext: Boolean = false
+    ) = CreatorChannelLiveTabResponse(
+        liveReplayContentCount = ids.size,
+        currentLive = currentLive,
+        liveReplayContents = ids.map { audioContent(it) },
+        sort = sort,
+        page = page,
+        size = CreatorChannelLiveViewModel.DEFAULT_PAGE_SIZE,
+        hasNext = hasNext
+    )
+
+    private fun audioContent(id: Long) = CreatorChannelAudioContentResponse(
+        audioContentId = id,
+        title = "다시듣기 $id",
+        duration = null,
+        imageUrl = null,
+        price = 0,
+        isPointAvailable = true,
+        isFirstContent = false,
+        seriesName = null,
+        isOriginalSeries = null
+    )
+
+    private fun <T> LiveData<T>.requireValue(): T? {
+        var value: T? = null
+        val observer = Observer<T> { value = it }
+        observeForever(observer)
+        removeObserver(observer)
+        return value
+    }
+}