*
 * <p><b>Warning:</b> The methods of {@code ForwardingSortedMap} forward <i>indiscriminately</i> to
 * the methods of the delegate. For example, overriding {@link #put} alone <i>will not</i> change
 * the behavior of {@link #putAll}, which can lead to unexpected behavior. In this case, you should
 * override {@code putAll} as well, either providing your own implementation, or delegating to the

    // Test that listeners added both before and after the value is available
    // get called correctly.
    for (int i = 0; i < 20; i++) {

      // Right in the middle start up a thread to close the latch.
      if (i == 10) {
        new Thread(() -> latch.countDown()).start();
      }

      future.addListener(listenerLatch::countDown, exec);
    }

    assertSame(Boolean.TRUE, future.get());

    assertThrows(IllegalArgumentException.class, () -> reader.mark(-1));
  }

  public void testMethodsThrowWhenClosed() throws IOException {
    CharSequenceReader reader = new CharSequenceReader("");
    reader.close();

    assertThrows(IOException.class, () -> reader.read());

    assertThrows(IOException.class, () -> reader.read(new char[10]));

    assertThrows(IOException.class, () -> reader.read(new char[10], 0, 10));

# Development - Contributing

First, you might want to see the basic ways to [help FastAPI and get help](help-fastapi.md){.internal-link target=_blank}.

## Developing

If you already cloned the <a href="https://github.com/fastapi/fastapi" class="external-link" target="_blank">fastapi repository</a> and you want to deep dive in the code, here are some guidelines to set up your environment.

### Virtual environment

        os.write(testData);
        os.flush();
        os.close();

        // Assert
        // Verify that data was written to the underlying stream through CacheStream
        verify(initialOutputStream).write(testData);
        verify(initialOutputStream).flush();
        verify(initialOutputStream).close();
    }

    /**

			if err != nil {
				logger.FatalIf(err, "Unable to get free port for Console UI on the host")
			}
			// hold the port
			l, err := net.Listen("TCP", fmt.Sprintf(":%s", p.String()))
			if err == nil {
				defer l.Close()
			}
			consoleAddr = net.JoinHostPort("", p.String())
		}

		if _, _, err := net.SplitHostPort(consoleAddr); err != nil {
			logger.FatalIf(err, "Unable to start listening on console port")
		}

                new TransferResource(null, null, "http://maven.org/test/test-resource", new File("file"), null);
        DefaultRepositorySystemSession session = new DefaultRepositorySystemSession(h -> false); // no close handle

        // for technical reasons we cannot throw here, even if delegate does cancel transfer
        listener.transferInitiated(event(session, resource, TransferEvent.EventType.INITIATED));

		// lk1; ref=1
		if !nsLk.lock(ctx, "volume", "path", "source", "opsID", false, time.Second) {
			t.Fatal("failed to acquire lock")
		}

		// lk2
		lk2ch := make(chan struct{})
		go func() {
			defer close(lk2ch)
			nsLk.lock(ctx, "volume", "path", "source", "opsID", false, 1*time.Millisecond)
		}()
		time.Sleep(1 * time.Millisecond) // wait for goroutine to advance; ref=2

		// Unlock the 1st lock; ref=1 after this line

        oos.writeObject(originalRule);
        oos.close();

        // Deserialize
        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
        ObjectInputStream ois = new ObjectInputStream(bais);
        TestRule deserializedRule = (TestRule) ois.readObject();
        ois.close();

        // Verify

    @BeforeEach
    void setUp() throws Exception {
        // Backup system properties to restore them after each test
        originalSystemProperties = (Properties) System.getProperties().clone();
        // Reset static state of the Handler class before each test for isolation
        resetHandlerState();
        handler = new Handler(mockCifsContext);
    }

    @AfterEach