RangeMap<Integer, Integer> copy = TreeRangeMap.copyOf(rangeMap);

    assertEquals(rangeMap.asMapOfRanges(), copy.asMapOfRanges());
  }

  // Overriding testEquals because it seems that we get spurious failures when it things empty
  // should be unequal to empty.
  public void testEquals() {
    TreeRangeMap<Integer, Integer> empty = TreeRangeMap.create();
    TreeRangeMap<Integer, Integer> nonEmpty = TreeRangeMap.create();

I'll give you more concrete examples in the next chapters.

## Restarts { #restarts }

Similar to making sure your application is run on startup, you probably also want to make sure it is **restarted** after failures.

### We Make Mistakes { #we-make-mistakes }

We, as humans, make **mistakes**, all the time. Software almost *always* has **bugs** hidden in different places. 🐛

                }
            }

            if (context.options().failNever().orElse(false)) {
                context.logger.info("Build failures were ignored.");
                return 0;
            } else {
                return 1;
            }
        } else {
            return 0;
        }
    }

func checkFailedUnlocks(locks []string, tolerance int) bool {
	unlocksFailed := 0
	for lockID := range locks {
		if isLocked(locks[lockID]) {
			unlocksFailed++
		}
	}

	// Unlock failures are higher than tolerance limit
	// for this instance of unlocker, we should let the
	// caller know that lock is not successfully released
	// yet.
	if len(locks)-tolerance == tolerance {

   * occur except for those produced by awaitUninterruptibly itself in response to interrupts.
   *
   * This isn't guaranteed to work, so any further spurious wakeups would probably cause failures in
   * tests that assert that a certain amount of time has passed, that the method returned `false`,
   * or even that an interrupt occurred (if the spurious wakeup happens before the interrupt).
   *

   * Float#valueOf(String)}, except that leading and trailing whitespace is not permitted.
   *
   * <p>This implementation is likely to be faster than {@code Float.parseFloat} if many failures
   * are expected.
   *
   * @param string the string representation of a {@code float} value
   * @return the floating point value represented by {@code string}, or {@code null} if {@code

   * Double#valueOf(String)}, except that leading and trailing whitespace is not permitted.
   *
   * <p>This implementation is likely to be faster than {@code Double.parseDouble} if many failures
   * are expected.
   *
   * @param string the string representation of a {@code double} value
   * @return the floating point value represented by {@code string}, or {@code null} if {@code

It could be **Docker** directly, **Docker Compose**, **Kubernetes**, a **cloud service**, etc.

In most (or all) cases, there's a simple option to enable running the container on startup and enabling restarts on failures. For example, in Docker, it's the command line option `--restart`.

			if failedClients[idx] {
				continue
			}
			client := client
			ng.Go(ctx, func() error {
				prs, ok := peerResults[client.String()]
				// We restart only on success, not for any failures.
				if ok && prs.Err == "" {
					return client.SignalService(serviceRestart, "", dryRun, &startTime)
				}
				return nil
			}, idx, *client.host)
		}

		for _, nerr := range ng.Wait() {

   * occur except for those produced by awaitUninterruptibly itself in response to interrupts.
   *
   * This isn't guaranteed to work, so any further spurious wakeups would probably cause failures in
   * tests that assert that a certain amount of time has passed, that the method returned `false`,
   * or even that an interrupt occurred (if the spurious wakeup happens before the interrupt).
   *