private static void verifyKeyIsRemoved(String regionName, String key) {
    Region<?, ?> region = getRegion(regionName);
    assertThat(region.get(key)).isNull();
  }
Test remove from a region with a zero-length string key (GEODE-2269)
geode-gfsh/src/distributedTest/java/org/apache/geode/management/internal/cli/commands/RemoveCommandDUnitTest.java