test depends on buildStorageArtifacts (#474)

diff --git a/tool/grind.dart b/tool/grind.dart
index c058294..f362914 100644
--- a/tool/grind.dart
+++ b/tool/grind.dart
@@ -28,6 +28,7 @@
 }
 
 @Task()
+@Depends(buildStorageArtifacts)
 Future test() => TestRunner().testAsync();
 
 @DefaultTask()