Added sample code for multiple flutters on iOS (#670)

tool/flutter_ci_script_dev.sh

@@ -7,6 +7,7 @@ declare -ar PROJECT_NAMES=(
     "add_to_app/prebuilt_module/flutter_module" \
     "add_to_app/plugin/flutter_module_using_plugin" \
     "add_to_app/books/flutter_module_books" \
+    "add_to_app/multiple_flutters/multiple_flutters_module" \
     "animations" \
     # Tracking issue: https://github.com/flutter/samples/issues/652
     # "flutter_maps_firestore" \
@@ -57,7 +58,10 @@ do
     flutter format -n --set-exit-if-changed .
 
     # Run the actual tests.
-    flutter test
+    if [ -d "test"]
+    then
+        flutter test
+    fi
 
     popd
 done