Adding Rally App to Flutter Samples (#135)

material_studies/rally/test/widget_test.dart

@@ -0,0 +1,18 @@
+// This is a basic Flutter widget test.
+//
+// To perform an interaction with a widget in your test, use the WidgetTester
+// utility that Flutter provides. For example, you can send tap and scroll
+// gestures. You can also use WidgetTester to find child widgets in the widget
+// tree, read text, and verify that the values of widget properties are correct.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:rally/app.dart';
+
+void main() {
+  testWidgets('Smoke test', (tester) async {
+    await tester.pumpWidget(RallyApp());
+    expect(find.byType(MaterialApp), findsOneWidget);
+  });
+}