* StackOverflowError: We can't reliably call setException(error).
     *
     * - Any kind of Error from a listener. Even if we could distinguish that case (by exposing some
     * extra state from AbstractFuture), our options are limited: A call to setException() would be
     * a no-op. We could log, but if that's what we really want, we should modify

                    ExceptionWithGoodAndBadConstructor.class,
                    1,
                    SECONDS));
    assertThat(expected).hasCauseThat().isSameInstanceAs(CHECKED_EXCEPTION);
  }

  // Edge case tests of the exception-construction code through untimed get():

  @SuppressWarnings("FuturesGetCheckedIllegalExceptionType")
  public void testGetCheckedUntimed_exceptionClassIsRuntimeException() {
    assertThrows(

 * the methods of the delegate. For example, overriding {@link #add(Object, int)} alone <b>will
 * not</b> change the behavior of {@link #add(Object)}, which can lead to unexpected behavior. In
 * this case, you should override {@code add(Object)} as well, either providing your own
 * implementation, or delegating to the provided {@code standardAdd} method.
 *

        // For this test, we'll simulate that no auth header means we should challenge
        // Since we can't mock the internal transport operations easily without real network,
        // we'll test the simpler case where no NTLM negotiation is needed
        when(request.getHeader("Authorization")).thenReturn(null);

        filter.doFilter(request, response, filterChain);

        // Should challenge the client

@NullMarked
public final class GcFinalization {
  private GcFinalization() {}

  /**
   * 10 seconds ought to be long enough for any object to be GC'ed and finalized. Unless we have a
   * gigantic heap, in which case we scale by heap size.
   */
  private static long timeoutSeconds() {
    // This class can make no hard guarantees.  The methods in this class are inherently flaky, but

            String result = notification.toString();
            assertTrue(result.contains("oplockLevel=" + oplockLevel));
        }
    }

    @Nested
    @DisplayName("Edge Case Tests")
    class EdgeCaseTests {

        @Test
        @DisplayName("Should handle minimum valid buffer size")
        void testMinimumBufferSize() throws Exception {

因為這些程式碼分別在應用開始接收請求**之前**與**完成**處理請求之後執行，所以涵蓋了整個應用的**生命週期**（「lifespan」這個詞稍後會很重要 😉）。

這對於為整個應用設定需要**共用**於多個請求的**資源**，以及在之後進行**清理**，非常有用。比如資料庫連線池、或載入一個共用的機器學習模型。

## 使用情境 { #use-case }

先從一個**使用情境**開始，然後看看如何用這個機制解決。

想像你有一些要用來處理請求的**機器學習模型**。🤖

同一組模型會在多個請求間共用，所以不是每個請求或每個使用者各有一個模型。

再想像一下，載入模型**需要一段時間**，因為它必須從**磁碟**讀取大量資料。所以你不想在每個請求都做一次。

                ],
            ),
        ):
            return item

    # TODO: enable these tests once/if Form(embed=False) is supported
    # TODO: In that case, define if File() should support example/examples too
    # @app.post("/form_example")
    # def form_example(firstname: str = Form(example="John")):
    #     return firstname

    # @app.post("/form_examples")

 *
 * <p>For example, the subclass could pass a {@link java.util.TreeMap} during construction, and
 * {@link #createCollection()} could return a {@link java.util.TreeSet}, in which case the
 * multimap's iterators would propagate through the keys and values in sorted order.
 *
 * <p>Keys and values may be null, as long as the underlying collection classes support null
 * elements.
 *

import junit.framework.AssertionFailedError;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;

/**
 * Tester that runs automated sanity tests for any given class. A typical use case is to test static
 * factory classes like:
 *
 * <pre>
 * interface Book {...}
 * public class Books {
 *   public static Book hardcover(String title) {...}
 *   public static Book paperback(String title) {...}