Enable FlutterTizenEngineTest.Run_Twice

Author: swift-kim

shell/platform/tizen/flutter_tizen_engine.cc

@@ -92,6 +92,10 @@ void FlutterTizenEngine::NotifyLowMemoryWarning() {
 }
 
 bool FlutterTizenEngine::RunEngine() {
+  if (engine_ != nullptr) {
+    FT_LOGE("The engine has already started.");
+    return false;
+  }
   if (IsHeaded() && !renderer->IsValid()) {
     FT_LOGE("The display was not valid.");
     return false;

shell/platform/tizen/flutter_tizen_engine_unittest.cc

@@ -48,14 +48,11 @@ class FlutterTizenEngineTestHeaded : public FlutterTizenEngineTest {
 TEST_F(FlutterTizenEngineTest, Run) {
   EXPECT_TRUE(engine_ != nullptr);
   EXPECT_TRUE(engine_->RunEngine());
-  EXPECT_TRUE(true);
 }
 
-// TODO
-TEST_F(FlutterTizenEngineTest, DISABLED_Run_Twice) {
+TEST_F(FlutterTizenEngineTest, Run_Twice) {
   EXPECT_TRUE(engine_->RunEngine());
   EXPECT_FALSE(engine_->RunEngine());
-  EXPECT_TRUE(true);
 }
 
 TEST_F(FlutterTizenEngineTest, Stop) {