Add missing KDoc documentation to MainFragmentStateTest.kt

Author: thirumani-vihaan

app/src/test/java/com/amaze/filemanager/ui/fragments/MainFragmentStateTest.kt

@@ -60,6 +60,9 @@ class MainFragmentStateTest {
 
     private lateinit var scenario: ActivityScenario<MainActivity>
 
+    /**
+     * Sets up the RxJava and RxAndroid schedulers to run synchronously for testing.
+     */
     @Before
     fun setUp() {
         RxJavaPlugins.reset()
@@ -70,6 +73,9 @@ class MainFragmentStateTest {
         ShadowSQLiteConnection.reset()
     }
 
+    /**
+     * Cleans up the Rx schedulers and releases the activity scenario.
+     */
     @After
     fun tearDown() {
         if (::scenario.isInitialized) {
@@ -82,6 +88,10 @@ class MainFragmentStateTest {
 
     private fun MainActivity.firstMainFragment(): MainFragment? = getTabFragment()?.getFragmentAtIndex(0) as? MainFragment
 
+    /**
+     * Verifies that the MainFragment correctly persists its internal state
+     * (currentPath and openMode) across activity recreation (e.g., rotation).
+     */
     @Test
     fun testMainFragmentSavesAndRestoresState() {
         scenario = ActivityScenario.launch(MainActivity::class.java)
@@ -94,8 +104,8 @@ class MainFragmentStateTest {
             val viewModel = mainFragment!!.mainFragmentViewModel
 
             // Set custom state that is different from default
-            viewModel.currentPath = "0"
-            viewModel.openMode = OpenMode.CUSTOM
+            viewModel!!.currentPath = "0"
+            viewModel!!.openMode = OpenMode.CUSTOM
         }
 
         // Trigger recreation (simulates configuration change/process death)
@@ -107,8 +117,8 @@ class MainFragmentStateTest {
             assertNotNull("MainFragment must be restored", mainFragment)
             val viewModel = mainFragment!!.mainFragmentViewModel
 
-            assertEquals("Path should be restored after recreation", "0", viewModel.currentPath)
-            assertEquals("OpenMode should be restored after recreation", OpenMode.CUSTOM, viewModel.openMode)
+            assertEquals("Path should be restored after recreation", "0", viewModel!!.currentPath)
+            assertEquals("OpenMode should be restored after recreation", OpenMode.CUSTOM, viewModel!!.openMode)
         }
     }
 }