Adding unit tests for ai panel

Author: amikhail48

ui/test/ai_panel_test.dart

@@ -0,0 +1,102 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:ui/ai_panel.dart';
+
+void main() {
+  group('AiChatPanel', () {
+    testWidgets('renders and hides with show=false', (WidgetTester tester) async {
+      await tester.pumpWidget(
+        MaterialApp(
+          home: AiChatPanel(
+            show: false,
+            provider: null,
+            systemPrompt: '',
+            currentGraph: null,
+          ),
+        ),
+      );
+      // Should have opacity 0.0
+      final animatedOpacity = tester.widget<AnimatedOpacity>(find.byType(AnimatedOpacity));
+      expect(animatedOpacity.opacity, equals(0.0));
+    });
+
+    testWidgets('renders and shows with show=true', (WidgetTester tester) async {
+      await tester.pumpWidget(
+        MaterialApp(
+          home: AiChatPanel(
+            show: true,
+            provider: null,
+            systemPrompt: '',
+            currentGraph: null,
+          ),
+        ),
+      );
+      // Should find header
+      expect(find.text('AI Assistant'), findsOneWidget);
+    });
+
+    testWidgets('calls onClose when close button is tapped', (WidgetTester tester) async {
+      bool closed = false;
+      await tester.pumpWidget(
+        MaterialApp(
+          home: AiChatPanel(
+            show: true,
+            provider: null,
+            systemPrompt: '',
+            currentGraph: null,
+            onClose: () => closed = true,
+          ),
+        ),
+      );
+      await tester.tap(find.byIcon(Icons.close));
+      expect(closed, isTrue);
+    });
+
+    testWidgets('shows No AI provider if provider is null', (WidgetTester tester) async {
+      await tester.pumpWidget(
+        MaterialApp(
+          home: AiChatPanel(
+            show: true,
+            provider: null,
+            systemPrompt: '',
+            currentGraph: null,
+          ),
+        ),
+      );
+      expect(find.text('No AI provider'), findsOneWidget);
+    });
+
+    testWidgets('animates panel visibility when show changes', (WidgetTester tester) async {
+      await tester.pumpWidget(
+        MaterialApp(
+          home: AiChatPanel(
+            show: false,
+            provider: null,
+            systemPrompt: '',
+            currentGraph: null,
+          ),
+        ),
+      );
+
+      // Initially hidden - opacity should be 0
+      final initialOpacity = tester.widget<AnimatedOpacity>(find.byType(AnimatedOpacity));
+      expect(initialOpacity.opacity, equals(0.0));
+
+      // Change to show
+      await tester.pumpWidget(
+        MaterialApp(
+          home: AiChatPanel(
+            show: true,
+            provider: null,
+            systemPrompt: '',
+            currentGraph: null,
+          ),
+        ),
+      );
+
+      // Should animate to visible - opacity should be 1
+      final finalOpacity = tester.widget<AnimatedOpacity>(find.byType(AnimatedOpacity));
+      expect(finalOpacity.opacity, equals(1.0));
+    });
+  });
+}