Java Unit testing Google AppEngine memcache standalone

Question

I'm attempting to write unit tests for my Java AppEngine application around my caching service. Any time I make a get or put I get the following exception:

Can't make API call memcache.Get in a thread that is neither the original request thread nor a thread created by ThreadManager

My implementation is simple enough:

MemcacheServiceFactory.getAsyncMemcacheService(NAMESPACE).get("key")
MemcacheServiceFactory.getAsyncMemcacheService(NAMESPACE).put("key", "value")

I have also tried:

MemcacheServiceFactory.getMemcacheService(NAMESPACE).get("key")
MemcacheServiceFactory.getMemcacheService(NAMESPACE).put("key", "value")

This works just fine when I'm running it as a "local deployment" as part of my web service as a whole, but the standalone test on this section of code will not work.

Is there any way to test the memcache service stand alone - outside of the gae envirnment?

Answer 1

Have you initialized LocalServiceTestHelper like that?

private final LocalServiceTestHelper helper =
  new LocalServiceTestHelper(new LocalMemcacheServiceTestConfig());

Here you can find an example: https://github.com/GoogleCloudPlatform/java-docs-samples/blob/master/unittests/src/test/java/com/google/appengine/samples/LocalMemcacheTest.java