@Test
  public void testGetLogFiles() throws IOException {
    // we use console appender in tests so the active log files should be empty
    assertTrue(Log4jUtils.getActiveLogFiles().isEmpty());
  }
This should be in the hbase-logging module but the {@link HBaseClassTestRule} is in hbase-common
so we can only put the class in hbase-common module for now...
hbase-common/src/test/java/org/apache/hadoop/hbase/logging/TestLog4jUtils.java