chore: updating changelog and adding tests for the new feature

Author: erickzanardo

CHANGELOG.md

@@ -2,6 +2,7 @@
  - feat: adding `NesIcons.shovel`.
  - feat: adding `NesDpad`
  - feat: adding `NesIcons.gem`.
+ - feat: adding `initialTabIndex` to `NesTabView`
 
 # 0.21.0
  - Update to Flutter 3.22.0

test/src/widgets/nes_tab_view_test.dart

@@ -32,6 +32,67 @@ void main() {
       expect(find.text('Tab 2 content'), findsNothing);
     });
 
+    testWidgets(
+      'renders the last tab when the initial index is out of bounds',
+      (tester) async {
+        await tester.pumpWidget(
+          MaterialApp(
+            theme: flutterNesTheme(),
+            home: const Scaffold(
+              body: NesTabView(
+                initialTabIndex: 99,
+                tabs: [
+                  NesTabItem(
+                    label: 'Tab 1',
+                    child: Text('Tab 1 content'),
+                  ),
+                  NesTabItem(
+                    label: 'Tab 2',
+                    child: Text('Tab 2 content'),
+                  ),
+                ],
+              ),
+            ),
+          ),
+        );
+
+        expect(find.byType(NesTabView), findsOneWidget);
+        expect(find.text('Tab 1'), findsOneWidget);
+        expect(find.text('Tab 1 content'), findsNothing);
+        expect(find.text('Tab 2'), findsOneWidget);
+        expect(find.text('Tab 2 content'), findsOneWidget);
+      },
+    );
+
+    testWidgets('renders correctly with initial tab index', (tester) async {
+      await tester.pumpWidget(
+        MaterialApp(
+          theme: flutterNesTheme(),
+          home: const Scaffold(
+            body: NesTabView(
+              initialTabIndex: 1,
+              tabs: [
+                NesTabItem(
+                  label: 'Tab 1',
+                  child: Text('Tab 1 content'),
+                ),
+                NesTabItem(
+                  label: 'Tab 2',
+                  child: Text('Tab 2 content'),
+                ),
+              ],
+            ),
+          ),
+        ),
+      );
+
+      expect(find.byType(NesTabView), findsOneWidget);
+      expect(find.text('Tab 1'), findsOneWidget);
+      expect(find.text('Tab 1 content'), findsNothing);
+      expect(find.text('Tab 2'), findsOneWidget);
+      expect(find.text('Tab 2 content'), findsOneWidget);
+    });
+
     testWidgets('can select a different tab', (tester) async {
       await tester.pumpWidget(
         MaterialApp(