*   tf.py_func now reports the full stack trace if an exception occurs.
    *   Integrate `TPUClusterResolver` with GKE's integration for Cloud TPUs.
    *   Add a library for statistical testing of samplers.
    *   Add Helpers to stream data from the GCE VM to a Cloud TPU.
    *   Integrate ClusterResolvers with TPUEstimator.
    *   Unify metropolis_hastings interface with HMC kernel.

* Remove obsolete Chinese articles after adding official community translations. PR [#1510](https://github.com/tiangolo/fastapi/pull/1510) by [@waynerv](https://github.com/waynerv).
* Add `__repr__` for *path operation function* parameter helpers (like `Query`, `Depends`, etc) to simplify debugging. PR [#1560](https://github.com/tiangolo/fastapi/pull/1560) by [@rkbeatss](https://github.com/rkbeatss) and [@victorphoenix3](https://github.com/victorphoenix3).

        assertNotNull(helper.duplicateHostList);
        assertEquals(1, helper.duplicateHostList.size());
        assertEquals("www.test.com", helper.duplicateHostList.get(0).getRegularName());
    }

    @Test
    public void test_add_withNullList() {
        DuplicateHostHelper helper = new DuplicateHostHelper();
        helper.duplicateHostList = null;

        // Test default state
        assertTrue(helper.isCrawlerRunning());

        // Test setting to false
        helper.setCrawlerRunning(false);
        assertFalse(helper.isCrawlerRunning());

        // Test setting back to true
        helper.setCrawlerRunning(true);
        assertTrue(helper.isCrawlerRunning());
    }

    @Test

        LogNotificationHelper helper = new LogNotificationHelper();
        // destroy() without init() should not throw NPE because of null checks
        helper.destroy();
    }

    @Test
    public void test_init_destroy_multipleRounds() {
        LogNotificationHelper helper = new LogNotificationHelper();
        helper.init();
        helper.destroy();
        // Second round
        helper.init();

	</component>
	<component name="labelTypeHelper" class="org.codelibs.fess.helper.LabelTypeHelper">
	</component>
	<component name="rateLimitHelper" class="org.codelibs.fess.helper.RateLimitHelper">
	</component>
	<component name="relatedContentHelper" class="org.codelibs.fess.helper.RelatedContentHelper">
	</component>
	<component name="relatedQueryHelper" class="org.codelibs.fess.helper.RelatedQueryHelper">
	</component>

	</component>
	<component name="indexingHelper" class="org.codelibs.fess.helper.IndexingHelper">
	</component>
	<component name="notificationHelper" class="org.codelibs.fess.helper.NotificationHelper">
	</component>
	<component name="logNotificationHelper" class="org.codelibs.fess.helper.LogNotificationHelper">
	</component>
	<component name="pathMappingHelper" class="org.codelibs.fess.helper.PathMappingHelper">

      void addEntries(MoreObjects.ToStringHelper helper) {
        helper
            .add(SHORT_NAME, 10)
            .addValue(10L)
            .add(SHORT_NAME, 3.14f)
            .addValue(3.14d)
            .add(LONG_NAME, false)
            .add(LONG_NAME, LONG_NAME);
      }
    },
    CONDITIONAL {
      @Override
      void addEntries(MoreObjects.ToStringHelper helper) {
        helper
            .add(SHORT_NAME, "x")

	<component name="labelTypeHelper" class="org.codelibs.fess.helper.LabelTypeHelper">
	</component>
	<component name="webFsIndexHelper" class="org.codelibs.fess.helper.WebFsIndexHelper">
	</component>
	<component name="dataIndexHelper" class="org.codelibs.fess.helper.DataIndexHelper">
	</component>
	<component name="duplicateHostHelper" class="org.codelibs.fess.helper.DuplicateHostHelper">
	</component>

        } catch (final Exception e) {
            return;
        }

        final LogNotificationHelper helper;
        try {
            helper = ComponentUtil.getLogNotificationHelper();
        } catch (final Exception e) {
            return;
        }

        final List<LogNotificationEvent> events = helper.drainAll();
        if (events.isEmpty()) {
            return;
        }

        try {