test: add tests for status form

test/screens_test/tabs_test.dart

@@ -22,5 +22,8 @@ void main() {
     expect(find.text('Home'), findsOneWidget);
     expect(find.text('Local'), findsOneWidget);
     expect(find.text('Fedi'), findsOneWidget);
+
+    // Expect to find the new status button
+    expect(find.byIcon(Icons.create_rounded), findsOneWidget);
   });
 }

test/widgets_test/status_form_test.dart

@@ -0,0 +1,38 @@
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:flutter/material.dart';
+import 'package:feathr/widgets/status_form.dart';
+
+import '../utils.dart';
+
+void main() {
+  testWidgets(
+    'Status Form handles invalid data',
+    (WidgetTester tester) async {
+      await tester.pumpWidget(
+        MaterialApp(
+          home: Scaffold(
+            body: Column(
+              children: [
+                StatusForm(
+                    apiService: getTestApiService(),
+                    onSuccessfulSubmit: (_) => {})
+              ],
+            ),
+          ),
+        ),
+      );
+
+      // Initial render
+      expect(find.byType(StatusForm), findsOneWidget);
+      expect(find.text('What\'s on your mind?'), findsOneWidget);
+      expect(find.text('Post'), findsOneWidget);
+      expect(find.text('This field should not be empty'), findsNothing);
+
+      // Attempting to post without a value
+      await tester.tap(find.text('Post'));
+      await tester.pump(const Duration(milliseconds: 100));
+      expect(find.text('This field should not be empty'), findsOneWidget);
+    },
+  );
+}