"timeout": "0s",
                      "retry_policy": {
                        "retry_on": "connect-failure,refused-stream,unavailable,cancelled,retriable-status-codes",
                        "num_retries": 2,
                        "retry_host_predicate": [
                          {
                            "name": "envoy.retry_host_predicates.previous_hosts"
                          }

                      "timeout": "0s",
                      "retry_policy": {
                        "retry_on": "connect-failure,refused-stream,unavailable,cancelled,retriable-status-codes",
                        "num_retries": 2,
                        "retry_host_predicate": [
                          {
                            "name": "envoy.retry_host_predicates.previous_hosts"
                          }

           "timeout": "0s",
           "retry_policy": {
            "retry_on": "connect-failure,refused-stream,unavailable,cancelled,retriable-status-codes",
            "num_retries": 2,
            "retry_host_predicate": [
             {
              "name": "envoy.retry_host_predicates.previous_hosts",
              "typed_config": {
               "@type": "type.googleapis.com/envoy.extensions.retry.host.previous_hosts.v3.PreviousHostsPredicate"

	return nil
}

// compareConfResult does a string compare of 2 test files.
func compareConfResult(result, expected string, t *testing.T) {
	t.Helper()
	retry.UntilSuccessOrFail(t, func() error {
		return checkResult(result, expected)
	}, retry.Delay(time.Millisecond*10), retry.Timeout(time.Second*3))
}

// checkBinDir verifies the presence/absence of test files.

		if err = osMkdirAll(dirPath, mode, baseDir); err != nil {
			// Retry only for the first retryable error.
			if osIsNotExist(err) && i == 0 {
				i++
				// Determine if os.NotExist error is because of
				// baseDir's parent being present, retry it once such
				// that the MkdirAll is retried once for the parent
				// of dirPath.
				// Because it is worth a retry to skip a different
				// baseDir which is slightly higher up the depth.

				return
			}
		case "Notify":
			err = z.Notify.DecodeMsg(dc)
			if err != nil {
				err = msgp.WrapError(err, "Notify")
				return
			}
		case "Retry":
			err = z.Retry.DecodeMsg(dc)
			if err != nil {
				err = msgp.WrapError(err, "Retry")
				return
			}
		default:
			err = dc.Skip()
			if err != nil {
				err = msgp.WrapError(err)
				return
			}
		}
	}
	return
}

           "timeout": "0s",
           "retry_policy": {
            "retry_on": "connect-failure,refused-stream,unavailable,cancelled,retriable-status-codes",
            "num_retries": 2,
            "retry_host_predicate": [
             {
              "name": "envoy.retry_host_predicates.previous_hosts",
              "typed_config": {
               "@type": "type.googleapis.com/envoy.extensions.retry.host.previous_hosts.v3.PreviousHostsPredicate"

    )
    assertThat(callbacks.remove()).isEqualTo(Event("1", null, "first event"))
    assertThat(callbacks.remove()).isEqualTo(Event("1", null, "second event"))
  }

  @Test
  fun retry() {
    consumeEvents(
      """
      |retry: 22
      |
      |data: first event
      |id: 1
      |
      |
      """.trimMargin(),
    )
    assertThat(callbacks.remove()).isEqualTo(22L)

      // If the problem was a CertificateException from the X509TrustManager,
      // do not retry.
      if (e.cause is CertificateException) {
        return false
      }
    }
    if (e is SSLPeerUnverifiedException) {
      // e.g. a certificate pinning error.
      return false
    }
    // An example of one we might want to retry with a different route is a problem connecting to a

    var tlsConnectDelayNanos = 0L
    var tlsConnectThrowable: Throwable? = null
    var connectTlsNextPlan: FakePlan? = null

    fun createRetry(): FakePlan {
      check(retry == null)
      return FakePlan(nextPlanId++)
        .also {
          retry = it
        }
    }

    fun createConnectTcpNextPlan(): FakePlan {
      check(connectTcpNextPlan == null)
      return FakePlan(nextPlanId++)
        .also {