[rfw] Restore RFW to 100% coverage after ButtonBar update (flutter#6020)

fixes [[`rfw`]  Restore RFW to 100% coverage after ButtonBar update](flutter#142602)

### Before

![BEFORE](https://github.com/flutter/packages/assets/48603081/b0671646-d74e-4cc8-a421-23b7130788c8)

### After 

![AFTER](https://github.com/flutter/packages/assets/48603081/c55c7974-fc8f-4c0a-a853-9f4fdf622bac)

Author: TahaTesser

packages/rfw/CHANGELOG.md

@@ -1,3 +1,8 @@
+## 1.0.22
+
+* Adds more testing to restore coverage to 100%.
+* Format documentation.
+
 ## 1.0.21
 
 * Adds support for subscribing to the root of a `DynamicContent` object.

packages/rfw/lib/src/flutter/material_widgets.dart

@@ -140,18 +140,18 @@ Map<String, LocalWidgetBuilder> get _materialWidgetsDefinitions => <String, Loca
     );
   },
 
-  // The ButtonBar widget in package:flutter/material.dart is planned to be deprecated
-  // in favor of the OverflowBar widget. This ButtonBar implementation uses the
-  // OverflowBar widget internally for backward compatibility. The ButtonBar
-  // widget in rfw package is not deprecated and will continue to be supported.
+  // The [ButtonBar] widget in Flutter's material library is planned to be deprecated
+  // in favor of the [OverflowBar] widget. This [ButtonBar] implementation uses the
+  // [OverflowBar] widget internally for backward compatibility. The [ButtonBar]
+  // widget in `rfw` package is not deprecated and will continue to be supported.
   //
-  // The ButtonBar widget in package:flutter/material.dart has changed over time.
+  // The [ButtonBar] widget in Flutter's material library has changed over time.
   // The following parameters are no longer supported:
-  //  - buttonMinWidth
-  //  - buttonHeight
-  //  - buttonAlignedDropdown
+  //  - `buttonMinWidth`
+  //  - `buttonHeight`
+  //  - `buttonAlignedDropdown`
   //
-  // It is recommended to use the OverflowBar widget.
+  // It is recommended to use the [OverflowBar] widget.
   'ButtonBar': (BuildContext context, DataSource source) {
     final EdgeInsetsGeometry buttonPadding = ArgumentDecoders.edgeInsets(source, ['buttonPadding']) ?? const EdgeInsets.all(8.0);
     final ButtonBarLayoutBehavior layoutBehavior = ArgumentDecoders.enumValue<ButtonBarLayoutBehavior>(ButtonBarLayoutBehavior.values, source, ['layoutBehavior'])

packages/rfw/pubspec.yaml

@@ -2,7 +2,7 @@ name: rfw
 description: "Remote Flutter widgets: a library for rendering declarative widget description files at runtime."
 repository: https://github.com/flutter/packages/tree/main/packages/rfw
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+rfw%22
-version: 1.0.21
+version: 1.0.22
 
 environment:
   sdk: ">=3.0.0 <4.0.0"

packages/rfw/test/goldens/material_test.button_bar_properties.overflow.png

@@ -38,8 +38,10 @@ void main() {
         ),
       ),
     );
-    expect(tester.takeException().toString(),
-        contains('Could not find remote widget named'));
+    expect(
+      tester.takeException().toString(),
+      contains('Could not find remote widget named'),
+    );
 
     runtime.update(const LibraryName(<String>['test']), parseLibraryFile('''
       import core;
@@ -225,6 +227,82 @@ void main() {
     );
   });
 
+  testWidgets('Implement ButtonBar properties', (WidgetTester tester) async {
+    final Runtime runtime = setupRuntime();
+    final DynamicContent data = DynamicContent();
+    final List<String> eventLog = <String>[];
+    await tester.pumpWidget(
+      MaterialApp(
+        theme: ThemeData(useMaterial3: false),
+        home: RemoteWidget(
+          runtime: runtime,
+          data: data,
+          widget: const FullyQualifiedWidgetName(testName, 'root'),
+          onEvent: (String eventName, DynamicMap eventArguments) {
+            eventLog.add('$eventName $eventArguments');
+          },
+        ),
+      ),
+    );
+    expect(
+      tester.takeException().toString(),
+      contains('Could not find remote widget named'),
+    );
+
+    addTearDown(() async {
+      await tester.binding.setSurfaceSize(null);
+    });
+
+    runtime.update(testName, parseLibraryFile('''
+      import core;
+      import material;
+      widget root = Scaffold(
+        body: Center(
+          child: ButtonBar(
+            buttonPadding: [8.0],
+            layoutBehavior: 'constrained',
+            alignment: 'end',
+            overflowDirection: 'up',
+            overflowButtonSpacing: 8.0,
+            mainAxisSize: 'min',
+            children: [
+              ElevatedButton(
+                onPressed: event 'button' { },
+                child: Text(text: 'Elevated'),
+              ),
+              OutlinedButton(
+                onPressed: event 'button' { },
+                child: Text(text: 'Outlined'),
+              ),
+              TextButton(
+                onPressed: event 'button' { },
+                child: Text(text: 'Text'),
+              ),
+            ],
+          ),
+        ),
+      );
+    '''));
+    await tester.pump();
+
+    await expectLater(
+      find.byType(RemoteWidget),
+      matchesGoldenFile('goldens/material_test.button_bar_properties.png'),
+      skip: !runGoldens,
+    );
+
+    // Update the surface size for ButtonBar to overflow.
+    await tester.binding.setSurfaceSize(const Size(200.0, 600.0));
+    await tester.pump();
+
+    await expectLater(
+      find.byType(RemoteWidget),
+      matchesGoldenFile(
+          'goldens/material_test.button_bar_properties.overflow.png'),
+      skip: !runGoldens,
+    );
+  });
+
   testWidgets('OverflowBar configured to resemble ButtonBar',
       (WidgetTester tester) async {
     final Runtime runtime = setupRuntime();
@@ -243,8 +321,10 @@ void main() {
         ),
       ),
     );
-    expect(tester.takeException().toString(),
-        contains('Could not find remote widget named'));
+    expect(
+      tester.takeException().toString(),
+      contains('Could not find remote widget named'),
+    );
 
     runtime.update(testName, parseLibraryFile('''
       import core;
@@ -301,8 +381,10 @@ void main() {
         ),
       ),
     );
-    expect(tester.takeException().toString(),
-        contains('Could not find remote widget named'));
+    expect(
+      tester.takeException().toString(),
+      contains('Could not find remote widget named'),
+    );
 
     addTearDown(() async {
       await tester.binding.setSurfaceSize(null);