> +         Set<? extends Reservation<? extends RunningInstance>> allResults = 
> client.describeInstancesInRegion(region);
> +         assertNotNull(allResults);
> +         assert allResults.size() >= 0 : allResults.size();
> +
> +         if (allResults.size() > 0)  {
> +            RunningInstance instance = getFirst(getFirst(allResults, null), 
> null);
> +
> +            assertNotNull(instance);
> +
> +            Set<? extends Reservation<? extends RunningInstance>> 
> filterResults = client.filterInstancesInRegion(region,
> +                    ImmutableMultimap.<String, String>builder()
> +                            .put("key-name", instance.getKeyName())
> +                            .build());
> +
> +            assertNotNull(filterResults);
> +            assertTrue(filterResults.size() > 0, "No results found for 
> filter, but there should be.");

`!filterResults.isEmpty()`?

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