private void validateLocalKeySet(final int key, final Iterable<Integer> keys) {
    assertThat(Collections.singleton(key)).isEqualTo(keys);
    assertThat(keys).hasSize(1);
  }
Assert the {@link RegionFunctionContext} yields the proper objects.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/execute/PRFunctionExecutionDUnitTest.java