Update tests and avoid useless recomposition

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/RoomDetailsPresenter.kt

@@ -34,7 +34,7 @@ import io.element.android.libraries.matrix.api.room.MatrixRoom
 import io.element.android.libraries.matrix.api.room.MatrixRoomMembersState
 import io.element.android.libraries.matrix.api.room.RoomMember
 import io.element.android.libraries.matrix.api.room.RoomMembershipObserver
-import io.element.android.libraries.matrix.ui.room.directRoomMember
+import io.element.android.libraries.matrix.ui.room.getDirectRoomMember
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
 import javax.inject.Inject
@@ -58,9 +58,10 @@ class RoomDetailsPresenter @Inject constructor(
         LaunchedEffect(Unit) {
             room.updateMembers()
         }
+
         val membersState by room.membersStateFlow.collectAsState()
         val memberCount by getMemberCount(membersState)
-        val dmMember by room.directRoomMember()
+        val dmMember by room.getDirectRoomMember(membersState)
         val roomMemberDetailsPresenter = roomMemberDetailsPresenter(dmMember)
         val roomType = getRoomType(dmMember)
 
@@ -116,13 +117,15 @@ class RoomDetailsPresenter @Inject constructor(
     }
 
     @Composable
-    private fun getMemberCount(membersState: MatrixRoomMembersState): State<Async<Int>> = remember(membersState) {
-        derivedStateOf {
-            when (membersState) {
-                MatrixRoomMembersState.Unknown -> Async.Uninitialized
-                is MatrixRoomMembersState.Pending -> Async.Loading(prevState = membersState.prevRoomMembers?.size)
-                is MatrixRoomMembersState.Error -> Async.Failure(membersState.failure, prevState = membersState.prevRoomMembers?.size)
-                is MatrixRoomMembersState.Ready -> Async.Success(membersState.roomMembers.size)
+    private fun getMemberCount(membersState: MatrixRoomMembersState): State<Async<Int>> {
+        return remember(membersState) {
+            derivedStateOf {
+                when (membersState) {
+                    MatrixRoomMembersState.Unknown -> Async.Uninitialized
+                    is MatrixRoomMembersState.Pending -> Async.Loading(prevState = membersState.prevRoomMembers?.size)
+                    is MatrixRoomMembersState.Error -> Async.Failure(membersState.failure, prevState = membersState.prevRoomMembers?.size)
+                    is MatrixRoomMembersState.Ready -> Async.Success(membersState.roomMembers.size)
+                }
             }
         }
     }
@@ -148,3 +151,5 @@ class RoomDetailsPresenter @Inject constructor(
 }
 
 
+
+

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/members/details/RoomMemberDetailsPresenter.kt

@@ -33,10 +33,9 @@ import io.element.android.libraries.core.bool.orFalse
 import io.element.android.libraries.matrix.api.MatrixClient
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.room.MatrixRoom
-import io.element.android.libraries.matrix.ui.room.roomMember
+import io.element.android.libraries.matrix.ui.room.getRoomMember
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
-import timber.log.Timber
 
 class RoomMemberDetailsPresenter @AssistedInject constructor(
     private val client: MatrixClient,
@@ -52,7 +51,7 @@ class RoomMemberDetailsPresenter @AssistedInject constructor(
     override fun present(): RoomMemberDetailsState {
         val coroutineScope = rememberCoroutineScope()
         var confirmationDialog by remember { mutableStateOf<ConfirmationDialog?>(null) }
-        val roomMember by room.roomMember(roomMemberId)
+        val roomMember by room.getRoomMember(roomMemberId)
         // the room member is not really live...
         val isBlocked = remember {
             mutableStateOf(roomMember?.isIgnored.orFalse())

features/roomdetails/impl/src/test/kotlin/io/element/android/features/roomdetails/RoomDetailsPresenterTests.kt

@@ -86,16 +86,34 @@ class RoomDetailsPresenterTests {
 
     @Test
     fun `present - room member count is calculated asynchronously`() = runTest {
+        val error = RuntimeException()
         val room = aMatrixRoom()
+        val roomMembers = listOf(
+            aRoomMember(A_USER_ID),
+            aRoomMember(A_USER_ID_2),
+        )
         val presenter = aRoomDetailsPresenter(room)
         moleculeFlow(RecompositionClock.Immediate) {
             presenter.present()
         }.test {
+            room.givenRoomMembersState(MatrixRoomMembersState.Unknown)
             val initialState = awaitItem()
             Truth.assertThat(initialState.memberCount).isEqualTo(Async.Uninitialized)
-            room.givenRoomMembersState(MatrixRoomMembersState.Ready(emptyList()))
-            val finalState = awaitItem()
-            Truth.assertThat(finalState.memberCount).isEqualTo(Async.Success(0))
+
+            room.givenRoomMembersState(MatrixRoomMembersState.Pending(null))
+            val loadingState = awaitItem()
+            Truth.assertThat(loadingState.memberCount).isEqualTo(Async.Loading(null))
+
+            room.givenRoomMembersState(MatrixRoomMembersState.Error(error))
+            //skipItems(1)
+            val failureState = awaitItem()
+            Truth.assertThat(failureState.memberCount).isEqualTo(Async.Failure(error, null))
+
+            room.givenRoomMembersState(MatrixRoomMembersState.Ready(roomMembers))
+            //skipItems(1)
+            val successState = awaitItem()
+            Truth.assertThat(successState.memberCount).isEqualTo(Async.Success(roomMembers.size))
+
             cancelAndIgnoreRemainingEvents()
         }
     }
@@ -136,20 +154,6 @@ class RoomDetailsPresenterTests {
         }
     }
 
-    @Test
-    fun `present - can handle error while fetching member count`() = runTest {
-        val room = aMatrixRoom(name = null).apply {
-            givenRoomMembersState(MatrixRoomMembersState.Error(Throwable()))
-        }
-        val presenter = aRoomDetailsPresenter(room)
-        moleculeFlow(RecompositionClock.Immediate) {
-            presenter.present()
-        }.test {
-            Truth.assertThat(awaitItem().memberCount).isInstanceOf(Async.Failure::class.java)
-            cancelAndIgnoreRemainingEvents()
-        }
-    }
-
     @Test
     fun `present - Leave with confirmation on private room shows a specific warning`() = runTest {
         val room = aMatrixRoom(isPublic = false).apply {

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/room/MatrixRoomMembers.kt

@@ -24,12 +24,18 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.room.MatrixRoom
+import io.element.android.libraries.matrix.api.room.MatrixRoomMembersState
 import io.element.android.libraries.matrix.api.room.RoomMember
 import io.element.android.libraries.matrix.api.room.roomMembers
 
 @Composable
-fun MatrixRoom.roomMember(userId: UserId): State<RoomMember?> {
+fun MatrixRoom.getRoomMember(userId: UserId): State<RoomMember?> {
     val roomMembersState by membersStateFlow.collectAsState()
+    return getRoomMember(roomMembersState = roomMembersState, userId = userId)
+}
+
+@Composable
+fun getRoomMember(roomMembersState: MatrixRoomMembersState, userId: UserId): State<RoomMember?> {
     val roomMembers = roomMembersState.roomMembers()
     return remember(roomMembers) {
         derivedStateOf {
@@ -41,8 +47,13 @@ fun MatrixRoom.roomMember(userId: UserId): State<RoomMember?> {
 }
 
 @Composable
-fun MatrixRoom.directRoomMember(): State<RoomMember?> {
+fun MatrixRoom.getDirectRoomMember(): State<RoomMember?> {
     val roomMembersState by membersStateFlow.collectAsState()
+    return getDirectRoomMember(roomMembersState = roomMembersState)
+}
+
+@Composable
+fun MatrixRoom.getDirectRoomMember(roomMembersState: MatrixRoomMembersState): State<RoomMember?> {
     val roomMembers = roomMembersState.roomMembers()
     return remember(roomMembers) {
         derivedStateOf {
@@ -56,3 +67,4 @@ fun MatrixRoom.directRoomMember(): State<RoomMember?> {
         }
     }
 }
+