From cc33628e5fd81e0702a48ecb20677b97adb3ae58 Mon Sep 17 00:00:00 2001
From: Marty Oehme <marty.oehme@gmail.com>
Date: Sat, 25 Aug 2018 14:51:28 +0200
Subject: [PATCH] Enable cached engine returns for EngineService

---
 lib/service/engine_service.dart       |  6 ++++--
 test/service/engine_service_test.dart | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+), 2 deletions(-)
 create mode 100644 test/service/engine_service_test.dart

diff --git a/lib/service/engine_service.dart b/lib/service/engine_service.dart
index f6c7304..69f4699 100644
--- a/lib/service/engine_service.dart
+++ b/lib/service/engine_service.dart
@@ -5,13 +5,15 @@ import 'package:rules_of_living/src/Engine.dart';
 class EngineService {
   Engine _engine;
 
-  Engine get engine => _engine ?? create(null);
+  Engine get engine => _engine ?? createEngine(null);
 
-  Engine create(html.CanvasElement canvas) {
+  Engine createEngine(html.CanvasElement canvas) {
     _engine = Engine(canvas);
     return _engine;
   }
 
+  void setCanvas(html.CanvasElement canvas) => engine.canvas = canvas;
+
   void run() {
     engine.running = true;
   }
diff --git a/test/service/engine_service_test.dart b/test/service/engine_service_test.dart
new file mode 100644
index 0000000..9d4a226
--- /dev/null
+++ b/test/service/engine_service_test.dart
@@ -0,0 +1,19 @@
+@TestOn('browser')
+
+import 'package:test/test.dart';
+import 'package:rules_of_living/service/engine_service.dart';
+
+void main() {
+  EngineService sut;
+  setUp(() {
+    sut = EngineService();
+  });
+
+  test("EngineService creates an engine on demand", () {
+    expect(sut.engine, isNotNull);
+  });
+
+  test("EngineService returns the cached engine on subsequent requests", () {
+    expect(sut.engine, allOf(isNotNull, equals(sut.engine)));
+  });
+}