adding missing image gallery reducer tests

domains/state/src/testFixtures/kotlin/test/ReducerTest.kt

@@ -39,6 +39,8 @@ class ReducerTestScope<S, E>(
     private val expectTestScope: ExpectTestScope
 ) : ExpectTestScope by expectTestScope, Reducer<S> {
 
+    private var invalidateCapturedState: Boolean = false
+    private val actionSideEffects = mutableMapOf<Action, () -> S>()
     private var manualState: S? = null
     private var capturedResult: S? = null
 
@@ -47,6 +49,10 @@ class ReducerTestScope<S, E>(
         override val coroutineScope = CoroutineScope(UnconfinedTestDispatcher())
         override fun dispatch(action: Action) {
             actionCaptures.add(action)
+
+            if (actionSideEffects.containsKey(action)) {
+                setState(actionSideEffects.getValue(action).invoke(), invalidateCapturedState = true)
+            }
         }
 
         override fun getState() = manualState ?: reducerFactory.initialState()
@@ -54,15 +60,20 @@ class ReducerTestScope<S, E>(
     private val reducer: Reducer<S> = reducerFactory.create(reducerScope)
 
     override fun reduce(action: Action) = reducer.reduce(action).also {
-        capturedResult = it
+        capturedResult = if (invalidateCapturedState) manualState else it
     }
 
-    fun setState(state: S) {
+    fun actionSideEffect(action: Action, handler: () -> S) {
+        actionSideEffects[action] = handler
+    }
+
+    fun setState(state: S, invalidateCapturedState: Boolean = false) {
         manualState = state
+        this.invalidateCapturedState = invalidateCapturedState
     }
 
     fun setState(block: (S) -> S) {
-        manualState = block(reducerScope.getState())
+        setState(block(reducerScope.getState()))
     }
 
     fun assertInitialState(expected: S) {

features/messenger/src/main/kotlin/app/dapk/st/messenger/gallery/state/ImageGalleryReducer.kt

@@ -46,7 +46,6 @@ fun imageGalleryReducer(
                     parent = ImageGalleryPage.Routes.folders,
                     state = ImageGalleryPage.Files(Lce.Loading(), action.folder)
                 )
-
                 dispatch(PageAction.GoTo(page))
 
                 jobBag.replace(ImageGalleryPage.Files::class, coroutineScope.launch {

features/messenger/src/test/kotlin/app/dapk/st/messenger/gallery/state/ImageGalleryReducerTest.kt

@@ -1,54 +1,123 @@
 package app.dapk.st.messenger.gallery.state
 
+import android.net.Uri
 import app.dapk.st.core.Lce
+import app.dapk.st.core.page.PageAction
+import app.dapk.st.core.page.PageContainer
+import app.dapk.st.core.page.PageStateChange
 import app.dapk.st.design.components.SpiderPage
 import app.dapk.st.messenger.gallery.FetchMediaFoldersUseCase
 import app.dapk.st.messenger.gallery.FetchMediaUseCase
-import app.dapk.st.core.page.PageContainer
+import app.dapk.st.messenger.gallery.Folder
+import app.dapk.st.messenger.gallery.Media
 import app.dapk.state.Combined2
 import fake.FakeJobBag
+import fake.FakeUri
+import io.mockk.coEvery
 import io.mockk.mockk
 import org.junit.Test
+import test.assertOnlyDispatches
+import test.delegateReturn
+import test.expect
 import test.testReducer
 
 private const val A_ROOM_NAME = "a room name"
+private val A_FOLDER = Folder(
+    bucketId = "a-bucket-id",
+    title = "a title",
+    thumbnail = FakeUri().instance,
+)
+private val A_MEDIA_RESULT = listOf(aMedia())
+private val A_FOLDERS_RESULT = listOf(aFolder())
+private val AN_INITIAL_FILES_PAGE = SpiderPage(
+    route = ImageGalleryPage.Routes.files,
+    label = "Send to $A_ROOM_NAME",
+    parent = ImageGalleryPage.Routes.folders,
+    state = ImageGalleryPage.Files(Lce.Loading(), A_FOLDER)
+)
+
+private val AN_INITIAL_FOLDERS_PAGE = SpiderPage(
+    route = ImageGalleryPage.Routes.folders,
+    label = "Send to $A_ROOM_NAME",
+    parent = null,
+    state = ImageGalleryPage.Folders(Lce.Loading())
+)
 
 class ImageGalleryReducerTest {
 
     private val fakeJobBag = FakeJobBag()
+    private val fakeFetchMediaFoldersUseCase = FakeFetchMediaFoldersUseCase()
+    private val fakeFetchMediaUseCase = FakeFetchMediaUseCase()
 
     private val runReducerTest = testReducer { _: (Unit) -> Unit ->
         imageGalleryReducer(
             A_ROOM_NAME,
-            FakeFetchMediaFoldersUseCase().instance,
-            FakeFetchMediaUseCase().instance,
+            fakeFetchMediaFoldersUseCase.instance,
+            fakeFetchMediaUseCase.instance,
             fakeJobBag.instance,
         )
     }
 
     @Test
     fun `initial state is folders page`() = runReducerTest {
-        assertInitialState(
-            Combined2(
-                state1 = PageContainer(
-                    SpiderPage(
-                        route = ImageGalleryPage.Routes.folders,
-                        label = "Send to $A_ROOM_NAME",
-                        parent = null,
-                        state = ImageGalleryPage.Folders(Lce.Loading())
-                    )
-                ),
-                state2 = Unit
-            )
+        assertInitialState(pageState(AN_INITIAL_FOLDERS_PAGE))
+    }
+
+    @Test
+    fun `when Visible, then updates Folders content`() = runReducerTest {
+        fakeJobBag.instance.expect { it.replace(ImageGalleryPage.Folders::class, any()) }
+        fakeFetchMediaFoldersUseCase.givenFolders().returns(A_FOLDERS_RESULT)
+
+        reduce(ImageGalleryActions.Visible)
+
+        assertOnlyDispatches(
+            PageStateChange.UpdatePage(AN_INITIAL_FOLDERS_PAGE.state.copy(content = Lce.Content(A_FOLDERS_RESULT)))
+        )
+    }
+
+    @Test
+    fun `when SelectFolder, then goes to Folder page and fetches content`() = runReducerTest {
+        fakeJobBag.instance.expect { it.replace(ImageGalleryPage.Files::class, any()) }
+        fakeFetchMediaUseCase.givenMedia(A_FOLDER.bucketId).returns(A_MEDIA_RESULT)
+        val goToFolderPage = PageAction.GoTo(AN_INITIAL_FILES_PAGE)
+        actionSideEffect(goToFolderPage) { pageState(goToFolderPage.page) }
+
+        reduce(ImageGalleryActions.SelectFolder(A_FOLDER))
+
+        assertOnlyDispatches(
+            goToFolderPage,
+            PageStateChange.UpdatePage(goToFolderPage.page.state.copy(content = Lce.Content(A_MEDIA_RESULT)))
         )
     }
 
 }
 
+private fun <P> pageState(page: SpiderPage<out P>) = Combined2(PageContainer(page), Unit)
+
 class FakeFetchMediaFoldersUseCase {
     val instance = mockk<FetchMediaFoldersUseCase>()
+
+    fun givenFolders() = coEvery { instance.fetchFolders() }.delegateReturn()
 }
 
 class FakeFetchMediaUseCase {
     val instance = mockk<FetchMediaUseCase>()
-}
+
+    fun givenMedia(bucketId: String) = coEvery { instance.getMediaInBucket(bucketId) }.delegateReturn()
+}
+
+fun aMedia(
+    id: Long = 1L,
+    uri: Uri = FakeUri().instance,
+    mimeType: String = "image/png",
+    width: Int = 100,
+    height: Int = 250,
+    size: Long = 1000L,
+    dateModifiedEpochMillis: Long = 5000L,
+) = Media(id, uri, mimeType, width, height, size, dateModifiedEpochMillis)
+
+fun aFolder(
+    bucketId: String = "a-bucket-id",
+    title: String = "a title",
+    thumbnail: Uri = FakeUri().instance,
+) = Folder(bucketId, title, thumbnail)