Initial commit

app/src/androidTest/java/com/aryan/reader/AppNavigationTest.kt

@@ -0,0 +1,118 @@
+// AppNavigationTest.kt
+package com.aryan.reader
+
+import android.net.Uri
+import androidx.compose.material3.windowsizeclass.ExperimentalMaterial3WindowSizeClassApi
+import androidx.compose.material3.windowsizeclass.WindowSizeClass
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.test.junit4.createComposeRule
+import androidx.compose.ui.unit.DpSize
+import androidx.compose.ui.unit.dp
+import androidx.navigation.compose.ComposeNavigator
+import androidx.navigation.testing.TestNavHostController
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.aryan.reader.epub.EpubBook
+import kotlinx.coroutines.flow.MutableStateFlow
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class AppNavigationTest {
+
+    @get:Rule
+    val composeTestRule = createComposeRule()
+
+    private lateinit var navController: TestNavHostController
+    private val fakeUiState = MutableStateFlow(ReaderScreenState())
+
+    // Mock ViewModel that uses the fake state
+    private val fakeViewModel: MainViewModel = object : MainViewModel(
+        ApplicationProvider.getApplicationContext()
+    ) {
+        override val uiState = fakeUiState
+        override fun clearSelectedFile() {
+            fakeUiState.value = fakeUiState.value.copy(
+                selectedFileType = null,
+                selectedPdfUri = null,
+                selectedEpubBook = null
+            )
+        }
+    }
+
+    @OptIn(ExperimentalMaterial3WindowSizeClassApi::class)
+    @Before
+    fun setup() {
+        composeTestRule.setContent {
+            navController = TestNavHostController(LocalContext.current)
+            navController.navigatorProvider.addNavigator(ComposeNavigator())
+            AppNavigation(
+                navController = navController,
+                windowSizeClass = WindowSizeClass.calculateFromSize(DpSize(400.dp, 800.dp)),
+                viewModel = fakeViewModel
+            )
+        }
+    }
+
+    @Test
+    fun appNavigation_defaultStartDestination_isMainRoute() {
+        val currentRoute = navController.currentBackStackEntry?.destination?.route
+        assertEquals(AppDestinations.MAIN_ROUTE, currentRoute)
+    }
+
+    @Test
+    fun appNavigation_whenPdfSelected_navigatesToPdfViewer() {
+        // Trigger state change
+        fakeUiState.value = ReaderScreenState(
+            selectedFileType = FileType.PDF,
+            selectedPdfUri = Uri.parse("content://dummy.pdf")
+        )
+
+        // Let compose recompose and run LaunchedEffect
+        composeTestRule.waitForIdle()
+
+        val currentRoute = navController.currentBackStackEntry?.destination?.route
+        assertEquals(AppDestinations.PDF_VIEWER_ROUTE, currentRoute)
+    }
+
+    @Test
+    fun appNavigation_whenEpubSelected_navigatesToEpubReader() {
+        // Trigger state change
+        fakeUiState.value = ReaderScreenState(
+            selectedFileType = FileType.EPUB,
+            selectedEpubBook = EpubBook(
+                fileName = "dummy.epub",
+                title = "Dummy Book",
+                author = "Author",
+                language = "en",
+                coverImage = null
+            )
+        )
+
+        composeTestRule.waitForIdle()
+
+        val currentRoute = navController.currentBackStackEntry?.destination?.route
+        assertEquals(AppDestinations.EPUB_READER_ROUTE, currentRoute)
+    }
+
+    @Test
+    fun appNavigation_whenFileCleared_navigatesBackToMain() {
+        // First, navigate to PDF viewer
+        fakeUiState.value = ReaderScreenState(
+            selectedFileType = FileType.PDF,
+            selectedPdfUri = Uri.parse("content://dummy.pdf")
+        )
+        composeTestRule.waitForIdle()
+        assertEquals(AppDestinations.PDF_VIEWER_ROUTE, navController.currentBackStackEntry?.destination?.route)
+
+        // Then, trigger the clear action (simulating onNavigateBack)
+        fakeViewModel.clearSelectedFile()
+        composeTestRule.waitForIdle()
+
+        val currentRoute = navController.currentBackStackEntry?.destination?.route
+        assertEquals(AppDestinations.MAIN_ROUTE, currentRoute)
+    }
+}