int written = resp.writeBytesWireFormat(buffer, index);

            // Assert
            assertEquals(0, written, "Should report 0 bytes written");
            assertArrayEquals(original, buffer, "Buffer must remain unchanged");
        }

        @Test
        @DisplayName("Handles null destination without throwing and returns 0")
        void allowsNullBuffer() {
            // Arrange

      if (closed) return

      if (bytesRemaining != 0L &&
        !discard(ExchangeCodec.DISCARD_STREAM_TIMEOUT_MILLIS, MILLISECONDS)
      ) {
        carrier.noNewExchanges() // Unread bytes remain on the stream.
        responseBodyComplete(TRAILERS_RESPONSE_BODY_TRUNCATED)
      }

      closed = true
    }
  }

  /** An HTTP body with alternating chunk sizes and chunk bodies. */

            assertEquals(pastExpiration, result.getExpiration());
            // toString should show negative remain time
            String str = result.toString();
            assertTrue(str.contains("remain="));
        }
    }

    }
  }

  /**
   * Records the provided object in {@link #methodArgument} and sets {@link #methodCalled}. This
   * method is called reflectively by Subscriber during tests, and must remain public.
   *
   * @param arg argument to record.
   */
  @Subscribe
  public void recordingMethod(Object arg) {
    assertFalse(methodCalled);
    methodCalled = true;
    methodArgument = arg;
  }

        assertThat(graph.removeNode(nodeList.get(i))).isTrue();
      }

      assertThat(graph.nodes()).isEmpty();
      assertThat(graph.edges()).isEmpty(); // no edges can remain if there's no nodes
      AbstractGraphTest.validateGraph(graph);

      Collections.shuffle(nodeList, gen);
      for (Integer node : nodeList) {
        assertThat(graph.addNode(node)).isTrue();
      }

            final int idx = i;
            assertEquals(expected[i], dst[offset + i], () -> "byte index " + idx);
        }
        // The region before offset and after the payload must remain untouched.
        for (int i = 0; i < offset; i++) {
            final int idx = i;
            assertEquals(0, dst[i], () -> "pre-offset byte " + idx + " modified");
        }

        assertEquals("success", result, "Operation should return correct result");
        assertEquals(State.CLOSED, circuitBreaker.getState(), "State should remain CLOSED");
        assertEquals(0, circuitBreaker.getFailureCount(), "Failure count should remain 0");
    }

    @Test
    public void testFailureThresholdOpensCircuit() {
        // Fail 3 times to open circuit
        for (int i = 0; i < 3; i++) {

	if [[ $? -eq 0 ]]; then
		echo "Outputs are consistent."
		break
	fi

	remaining_attempts=$((max_wait_attempts - attempt))
	if ((attempt >= max_wait_attempts)); then
		echo "Outputs remain inconsistent after $max_wait_attempts attempts. Exiting with error."
		exit 1
	else
		echo "Outputs are inconsistent. Waiting for $wait_interval seconds (attempt $attempt/$max_wait_attempts)."
		sleep $wait_interval
	fi

                    len -= cnt;
                    off += cnt;
                } else {
                    if (log.isTraceEnabled()) {
                        log.trace(String.format("Wrote at %d remain %d off %d len %d", this.fp, len - w, off, w));
                    }
                    this.req.setParam(fh.getFid(), this.fp, len - w, b, off, w);
                    th.send(this.req, this.rsp);

Let's look at how we can make that work.

## pytest.mark.anyio { #pytest-mark-anyio }