Tests for sample TodoApp TodoRoot

examples/todoapp/common/root/src/commonMain/kotlin/example/todo/common/root/TodoRoot.kt

@@ -4,6 +4,7 @@ import com.arkivanov.decompose.ComponentContext
 import com.arkivanov.decompose.RouterState
 import com.arkivanov.decompose.value.Value
 import com.arkivanov.mvikotlin.core.store.StoreFactory
+import com.badoo.reaktive.base.Consumer
 import example.todo.common.edit.TodoEdit
 import example.todo.common.main.TodoMain
 import example.todo.common.root.TodoRoot.Dependencies
@@ -27,4 +28,23 @@ interface TodoRoot {
 
 @Suppress("FunctionName") // Factory function
 fun TodoRoot(componentContext: ComponentContext, dependencies: Dependencies): TodoRoot =
-    TodoRootImpl(componentContext, dependencies)
+    TodoRootImpl(
+        componentContext = componentContext,
+        todoMain = { childContext, output ->
+            TodoMain(
+                componentContext = childContext,
+                dependencies = object : TodoMain.Dependencies, Dependencies by dependencies {
+                    override val mainOutput: Consumer<TodoMain.Output> = output
+                }
+            )
+        },
+        todoEdit = { childContext, itemId, output ->
+            TodoEdit(
+                componentContext = childContext,
+                dependencies = object : TodoEdit.Dependencies, Dependencies by dependencies {
+                    override val itemId: Long = itemId
+                    override val editOutput: Consumer<TodoEdit.Output> = output
+                }
+            )
+        }
+    )

examples/todoapp/common/root/src/commonMain/kotlin/example/todo/common/root/integration/TodoRootImpl.kt

@@ -13,13 +13,13 @@ import example.todo.common.edit.TodoEdit
 import example.todo.common.main.TodoMain
 import example.todo.common.root.TodoRoot
 import example.todo.common.root.TodoRoot.Child
-import example.todo.common.root.TodoRoot.Dependencies
 import example.todo.common.utils.Consumer
 
 internal class TodoRootImpl(
     componentContext: ComponentContext,
-    dependencies: Dependencies
+    private val todoMain: (ComponentContext, Consumer<TodoMain.Output>) -> TodoMain,
-) : TodoRoot, ComponentContext by componentContext, Dependencies by dependencies {
+    private val todoEdit: (ComponentContext, itemId: Long, Consumer<TodoEdit.Output>) -> TodoEdit
+) : TodoRoot, ComponentContext by componentContext {
 
     private val router =
         router<Configuration, Child>(
@@ -32,27 +32,10 @@ internal class TodoRootImpl(
 
     private fun createChild(configuration: Configuration, componentContext: ComponentContext): Child =
         when (configuration) {
-            is Configuration.Main -> Child.Main(todoMain(componentContext))
+            is Configuration.Main -> Child.Main(todoMain(componentContext, Consumer(::onMainOutput)))
-            is Configuration.Edit -> Child.Edit(todoEdit(componentContext, itemId = configuration.itemId))
+            is Configuration.Edit -> Child.Edit(todoEdit(componentContext, configuration.itemId, Consumer(::onEditOutput)))
         }
 
-    private fun todoMain(componentContext: ComponentContext): TodoMain =
-        TodoMain(
-            componentContext = componentContext,
-            dependencies = object : TodoMain.Dependencies, Dependencies by this {
-                override val mainOutput: Consumer<TodoMain.Output> = Consumer(::onMainOutput)
-            }
-        )
-
-    private fun todoEdit(componentContext: ComponentContext, itemId: Long): TodoEdit =
-        TodoEdit(
-            componentContext = componentContext,
-            dependencies = object : TodoEdit.Dependencies, Dependencies by this {
-                override val itemId: Long = itemId
-                override val editOutput: Consumer<TodoEdit.Output> = Consumer(::onEditOutput)
-            }
-        )
-
     private fun onMainOutput(output: TodoMain.Output): Unit =
         when (output) {
             is TodoMain.Output.Selected -> router.push(Configuration.Edit(itemId = output.id))

examples/todoapp/common/root/src/commonTest/kotlin/example/todo/common/root/integration/TodoEditFake.kt

@@ -0,0 +1,24 @@
+package example.todo.common.root.integration
+
+import com.arkivanov.decompose.value.Value
+import com.badoo.reaktive.base.Consumer
+import example.todo.common.edit.TodoEdit
+import example.todo.common.edit.TodoEdit.Model
+import example.todo.common.edit.TodoEdit.Output
+
+class TodoEditFake(
+    val itemId: Long,
+    val output: Consumer<Output>
+) : TodoEdit {
+
+    override val models: Value<Model> get() = TODO("Not used")
+
+    override fun onTextChanged(text: String) {
+    }
+
+    override fun onDoneChanged(isDone: Boolean) {
+    }
+
+    override fun onCloseClicked() {
+    }
+}

examples/todoapp/common/root/src/commonTest/kotlin/example/todo/common/root/integration/TodoMainFake.kt

@@ -0,0 +1,29 @@
+package example.todo.common.root.integration
+
+import com.arkivanov.decompose.value.Value
+import com.badoo.reaktive.base.Consumer
+import example.todo.common.main.TodoMain
+import example.todo.common.main.TodoMain.Model
+import example.todo.common.main.TodoMain.Output
+
+class TodoMainFake(
+    val output: Consumer<Output>
+) : TodoMain {
+
+    override val models: Value<Model> get() = TODO("Not used")
+
+    override fun onItemClicked(id: Long) {
+    }
+
+    override fun onItemDoneChanged(id: Long, isDone: Boolean) {
+    }
+
+    override fun onItemDeleteClicked(id: Long) {
+    }
+
+    override fun onInputTextChanged(text: String) {
+    }
+
+    override fun onAddItemClicked() {
+    }
+}

examples/todoapp/common/root/src/commonTest/kotlin/example/todo/common/root/integration/TodoRootTest.kt

@@ -0,0 +1,66 @@
+package example.todo.common.root.integration
+
+import com.arkivanov.decompose.DefaultComponentContext
+import com.arkivanov.decompose.lifecycle.LifecycleRegistry
+import com.arkivanov.decompose.lifecycle.resume
+import com.badoo.reaktive.base.invoke
+import example.todo.common.edit.TodoEdit
+import example.todo.common.main.TodoMain
+import example.todo.common.root.TodoRoot
+import example.todo.common.root.TodoRoot.Child
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+@Suppress("TestFunctionName")
+class TodoRootTest {
+
+    private val lifecycle = LifecycleRegistry().apply { resume() }
+
+    @Test
+    fun WHEN_created_THEN_TodoMain_displayed() {
+        val root = root()
+
+        assertTrue(root.activeChild is Child.Main)
+    }
+
+    @Test
+    fun GIVEN_TodoMain_displayed_WHEN_TodoMain_Output_Selected_THEN_TodoEdit_displayed() {
+        val root = root()
+
+        root.activeChild.asTodoMain().output(TodoMain.Output.Selected(id = 10L))
+
+        assertTrue(root.activeChild is Child.Edit)
+        assertEquals(10L, root.activeChild.asTodoEdit().itemId)
+    }
+
+    @Test
+    fun GIVEN_TodoEdit_displayed_WHEN_TodoEdit_Output_Finished_THEN_TodoMain_displayed() {
+        val root = root()
+        root.activeChild.asTodoMain().output(TodoMain.Output.Selected(id = 10L))
+
+        root.activeChild.asTodoEdit().output(TodoEdit.Output.Finished)
+
+        assertTrue(root.activeChild is Child.Main)
+    }
+
+    private fun root(): TodoRoot =
+        TodoRootImpl(
+            componentContext = DefaultComponentContext(lifecycle = lifecycle),
+            todoMain = { _, output -> TodoMainFake(output) },
+            todoEdit = { _, itemId, output -> TodoEditFake(itemId, output) }
+        )
+
+    private val TodoRoot.activeChild: Child get() = routerState.value.activeChild.component
+
+    private val Child.component: Any
+        get() =
+            when (this) {
+                is Child.Main -> component
+                is Child.Edit -> component
+            }
+
+    private fun Child.asTodoMain(): TodoMainFake = component as TodoMainFake
+
+    private fun Child.asTodoEdit(): TodoEditFake = component as TodoEditFake
+}