> @@ -36,6 +42,21 @@ public GoogleComputeEngineServiceLiveTest() {
>        provider = "google-compute-engine";
>     }
>  
> +   @Override
> +   protected Properties setupProperties() {
> +      Properties props = super.setupProperties();
> +      setCredentialFromPemFile(props, provider + ".credential");
> +      return props;
> +   }
> +
> +   @Test
> +   public void testGetImage() throws Exception {
> +      Set<? extends Image> images = client.listImages();
> +      String id = Iterables.getLast(images, null).getId();

Won't this blow up if `null` is returned as the default value? If `null` is 
never expected to be returned here, state that in a comment? And why "getLast" 
instead of e.g. "getFirst", for instance?

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