public static synchronized boolean hasCache() {
    return cache != null;
  }
Invokes {@link #getCache()} and casts the return to {@code GemFireCacheImpl}.

<p>
TODO: change all callers to use getCache and delete getGemfireCache

@deprecated Please use {@link #getCache} which returns InternalCache instead.
geode-dunit/src/main/java/org/apache/geode/test/dunit/cache/internal/JUnit4CacheTestCase.java