*  New: Support for SOCKS proxies.
 *  New: Support for `TLS_FALLBACK_SCSV`.
 *  New: Update HTTP/2 support to `h2-16` and `hpack-10`.
 *  New: APIs to prevent retrying non-idempotent requests.
 *  Fix: Drop NPN support. Going forward we support ALPN only.
 *  Fix: The hostname verifier is now strict. This is consistent with the hostname
    verifier in modern browsers.

        assertFalse(context.isClosed());

        // When
        context.close();

        // Then
        assertTrue(context.isClosed());

        // Should be idempotent
        assertDoesNotThrow(() -> context.close());

        // Cleanup
        keyManager.close();
    }

    @Test
    @DisplayName("Should rotate keys successfully")

}

// Close - calls the cleanup actions in reverse order
func (g *GetObjectReader) Close() error {
	if g == nil {
		return nil
	}
	// sync.Once is used here to ensure that Close() is
	// idempotent.
	g.once.Do(func() {
		for i := len(g.cleanUpFns) - 1; i >= 0; i-- {
			g.cleanUpFns[i]()
		}
	})
	return nil
}

     * DeferredCloser#eventuallyClose(Object, Executor)}.
     *
     * <p>If any such calls specified {@link MoreExecutors#directExecutor()}, those objects will be
     * closed synchronously.
     *
     * <p>Idempotent: objects will be closed at most once.
     */
    public void closeAsync() {
      closingFuture.close();
    }
  }

  /**

     * DeferredCloser#eventuallyClose(Object, Executor)}.
     *
     * <p>If any such calls specified {@link MoreExecutors#directExecutor()}, those objects will be
     * closed synchronously.
     *
     * <p>Idempotent: objects will be closed at most once.
     */
    public void closeAsync() {
      closingFuture.close();
    }
  }

  /**

- For CSI drivers, kubelet no longer creates the target_path for NodePublishVolume in accordance with the CSI spec. Kubelet also no longer checks if staging and target paths are mounts or corrupted. CSI drivers need to be idempotent and do any necessary mount verification. ([#88759](https://github.com/kubernetes/kubernetes/pull/88759), [@andyzhangx](https://github.com/andyzhangx)) [SIG Storage]

        assertNotNull(typedResult, "Typed result should not be null");
        assertEquals(customTree, typedResult, "Should maintain type safety");
    }

    /**
     * Test for close() idempotency.
     * Verifies that calling close multiple times has the same effect as calling it once.
     */
    @Test
    void testClose_idempotency() {
        // Mock a tree that tracks close state

- Fixed a race condition in kube-controller-manager and the scheduler, caused by
  a bug in the transforming informer during the Resync operation, 
  by making the transforming function idempotent. ([#124352](https://github.com/kubernetes/kubernetes/pull/124352), [@wojtek-t](https://github.com/wojtek-t)) [SIG API Machinery and Scheduling]

                throw new AssertionError("Should not have been invoked again");
            }
          }
        };

    assertTrue(iter.hasNext());
    assertEquals(0, (int) iter.next());

    // verify idempotence of hasNext()
    assertTrue(iter.hasNext());
    assertTrue(iter.hasNext());
    assertTrue(iter.hasNext());
    assertEquals(1, (int) iter.next());

    assertFalse(iter.hasNext());