initial commit: LeafViewer, LeafZoomable, LeafContextMenu, LeafPopover, LeafImage, misc widgets + tests

test/leaf_widgets_test.dart

@@ -0,0 +1,37 @@
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:leaf_widgets/leaf_widgets.dart';
+
+void main() {
+  testWidgets('barrel exports build all widgets', (tester) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          body: Column(
+            children: [
+              const AnimatedStar(),
+              const AnimatedFavoriteButton(),
+              LeafImage(image: MemoryImage(Uint8List(0))),
+              LeafPopover(
+                popoverBuilder: (context, controller) => const Card(child: Text('popover')),
+                child: const Text('trigger'),
+              ),
+              LeafContextMenu(
+                entries: const [ContextMenuAction(label: 'Copy')],
+                child: const Text('menu'),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+    expect(find.byType(AnimatedStar), findsOneWidget);
+    expect(find.byType(AnimatedFavoriteButton), findsOneWidget);
+    expect(find.byType(LeafImage), findsOneWidget);
+    expect(find.byType(LeafPopover), findsOneWidget);
+    expect(find.byType(LeafContextMenu), findsOneWidget);
+  });
+}