Add test to ensure new item is added correctly

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

app/src/androidTest/java/dev/msfjarvis/todo/MainActivityTest.kt

@@ -1,9 +1,13 @@
 package dev.msfjarvis.todo
 
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
 import androidx.ui.test.assertIsDisplayed
 import androidx.ui.test.createComposeRule
 import androidx.ui.test.onNodeWithTag
+import androidx.ui.test.onNodeWithText
 import androidx.ui.test.performClick
+import androidx.ui.test.performTextInput
 import dev.msfjarvis.todo.data.model.TodoItem
 import dev.msfjarvis.todo.ui.TodoTheme
 import org.junit.Rule
@@ -29,4 +33,23 @@ class MainActivityTest {
     onNodeWithTag("fab").performClick()
     onNodeWithTag("item_dialog").assertIsDisplayed()
   }
+
+  @Test
+  fun item_addition_adds_new_entry() {
+    composeTestRule.setContent {
+      val items by mutableStateOf(arrayListOf<TodoItem>())
+      TodoTheme {
+        TodoApp(
+          items,
+          items::add,
+          items::remove,
+        )
+      }
+    }
+    onNodeWithText("Item 1").assertDoesNotExist()
+    onNodeWithTag("fab").performClick()
+    onNodeWithTag("item_name").performTextInput("Item 1")
+    onNodeWithTag("add_button").performClick()
+    onNodeWithText("Item 1").assertIsDisplayed()
+  }
 }

app/src/main/java/dev/msfjarvis/todo/MainActivity.kt

@@ -108,6 +108,7 @@ fun ItemAddDialog(
         value = newItemName,
         onValueChange = { newItemName = it },
         label = { Text(text = "Name") },
+        modifier = Modifier.testTag("item_name")
       )
     },
     confirmButton = {
@@ -118,7 +119,8 @@ fun ItemAddDialog(
             newItemName = TextFieldValue("")
             hideDialog.invoke()
           }
-        }
+        },
+        modifier = Modifier.testTag("add_button")
       ) {
         Text(text = "Add")
       }