* certificate.
 *
 * Use of the chain cleaner is necessary to omit unexpected certificates that aren't relevant to
 * the TLS handshake and to extract the trusted CA certificate for the benefit of certificate
 * pinning.
 */
abstract class CertificateChainCleaner {
  @Throws(SSLPeerUnverifiedException::class)
  abstract fun clean(
    chain: List<Certificate>,
    hostname: String,
  ): List<Certificate>

                this.state = 6;
                cleanupThread(timeout);
            }
        }
    }

    /**
     * Cleans up the transport thread.
     *
     * @param timeout the maximum time to wait for thread cleanup in milliseconds
     * @throws TransportException if thread cleanup fails
     */
    private synchronized void cleanupThread(final long timeout) throws TransportException {

        // ## Act & Assert ##
        // close() should not throw even though the file was already deleted
        cos.close(); // done=true since getFile() was called, so cleanup is skipped
    }

    @Test
    public void testCloseWithoutGetFile_CleansUpTempFile() throws IOException {
        // ## Arrange ##
        ContentOutputStream cos = new ContentOutputStream(5, Curl.tmpDir);

}

@AfterClass
public static void afterClass() {
    runner.close();
    runner.clean();
}
```

### Testing Best Practices

- Minimize `Thread.sleep()` - use only when absolutely necessary
- For timestamp tests: use minimal delays (50-100ms)
- Clean only test-specific indices (not `_all` unless needed)
- Use `runner.refresh()` after index operations

        // Before cleanup
        GetIndexResponse beforeRemove = runner.admin().indices().prepareGetIndex().addIndices(getIndexName() + "*").execute().actionGet();
        assertTrue("Should have at least 2 indices before cleanup", beforeRemove.getIndices().length >= 2);

        // Remove orphaned indices
        suggester.removeDisableIndices();

        // After cleanup

                                } catch (Exception e) {
                                    // Ignore cleanup errors
                                }
                            });
                } catch (Exception e) {
                    // Ignore cleanup errors
                }
            }
        }
    }

    @Nested
    @DisplayName("Integration with AbstractUpgradeGoal")

    }

    @AfterEach
    public void tearDown() throws IOException {
        if (manager != null) {
            manager.shutdown();
        }

        // Clean up system property
        System.clearProperty("jcifs.smb.client.handleStateDirectory");

        // Clean up temp directory
        if (tempDir != null && Files.exists(tempDir)) {
            Files.walk(tempDir)

        } finally {
            // Cleanup
            try {
                client.admin().indices().prepareDelete(suggester.getIndex() + "*").execute().actionGet();
            } catch (Exception cleanupError) {
                // Ignore cleanup errors
            }
            suggester.shutdown();
        }

    public void tearDown() throws Exception {
        if (storage != null && !storage.isDestroyed()) {
            try {
                storage.close();
            } catch (Exception e) {
                // Ignore cleanup exceptions
            }
        }
        if (masterPassword != null) {
            Arrays.fill(masterPassword, '\0');
        }
    }

    @Test
    public void testEncryptDecrypt() throws Exception {

                try {
                    Files.delete(path);
                } catch (IOException e) {
                    // Ignore cleanup errors
                }
            });
        }
        super.tearDown(testInfo);
    }

    @Test
    public void test_getName() {
        // Test getting the generator name
        assertEquals("TestGenerator", thumbnailGenerator.getName());
    }

    @Test