assertEquals("Structure size is not 16", cause.getMessage(), "Should have correct error message");
        }

        @Test
        @DisplayName("Should write empty bytes for wire format")
        void testWriteBytesWireFormat() throws Exception {
            // Given
            byte[] buffer = new byte[100];

            // When

            int currentVersion = keyVersions.getOrDefault(sessionId, 0);
            int newVersion = currentVersion + 1;

            // Derive new key from current key
            String rotationLabel = String.format("KeyRotation-v%d", newVersion);
            byte[] newKey = deriveKey(currentKey, rotationLabel, String.valueOf(System.currentTimeMillis()).getBytes(), currentKey.length);

  @Test
  fun `parse generalized time with fractional seconds`() {
    assertThat(Adapters.parseGeneralizedTime("19920722132100.3Z"))
      .isEqualTo(date("1992-07-22T13:21:00.300+0000").time)
  }

  @Test fun `format generalized time`() {
    assertThat(Adapters.formatGeneralizedTime(date("1899-01-01T00:00:00.000+0000").time))
      .isEqualTo("18990101000000Z")

   *     arbitrary past or present time
   */
  abstract long reserveEarliestAvailable(int permits, long nowMicros);

  @Override
  public String toString() {
    return String.format(Locale.ROOT, "RateLimiter[stableRate=%3.1fqps]", getRate());
  }

  abstract static class SleepingStopwatch {
    /** Constructor for use by subclasses. */
    protected SleepingStopwatch() {}

    /*

# FORMAT NOT DOCUMENTED YET (parser is urltestparser.js)

# Based on http://trac.webkit.org/browser/trunk/LayoutTests/fast/url/script-tests/segments.js
http://example\t.\norg http://example.org/foo/bar s:http h:example.org p:/
http://user:pass@foo:21/bar;par?b#c  s:http u:user pass:pass h:foo port:21 p:/bar;par q:?b f:#c
http:foo.com  s:http h:example.org p:/foo/foo.com
\t\s\s\s:foo.com\s\s\s\n  s:http h:example.org p:/foo/:foo.com

    this.callCompletedLatch = new CountDownLatch(1);
  }

  private static String nameFor(
      Method method, Scenario scenario, boolean fair, Timeout timeout, Outcome expectedOutcome) {
    return String.format(
        Locale.ROOT,
        "%s%s(%s)/%s->%s",
        method.getName(),
        fair ? "(fair)" : "(nonfair)",
        (timeout == null) ? "untimed" : timeout,
        scenario,
        expectedOutcome);

                }
                buffer.append(item);
            }
            return buffer.toString();
        }

        /**
         * Return the contents in the same format that is used when you call toString() on a List.
         */
        private String toListString() {
            StringBuilder buffer = new StringBuilder();
            buffer.append("[");

Use `clang-tidy` to check your C/C++ changes. To install `clang-tidy` on ubuntu:16.04, do:

```bash
apt-get install -y clang-tidy
```

You can check a C/C++ file by doing:


```bash
clang-format <my_cc_file> --style=google > /tmp/my_cc_file.cc
diff <my_cc_file> /tmp/my_cc_file.cc
```

#### Python coding style

Changes to TensorFlow Python code should conform to

    for (int hi = 0; hi < 256; hi++) {
      for (int lo = 0; lo < 256; lo++) {
        char result = Chars.fromByteArray(new byte[] {(byte) hi, (byte) lo});
        assertWithMessage(
                String.format(
                    Locale.ROOT,
                    "hi=%s, lo=%s, expected=%s, result=%s",
                    hi,
                    lo,
                    (int) c,
                    (int) result))

            long timeSinceLastStateChangeMillis, double successRate, double availability) {

        @Override
        public String toString() {
            return String.format(
                    "CircuitBreakerMetrics[name=%s, state=%s, requests=%d, successes=%d, "
                            + "failures=%d, rejections=%d, successRate=%.2f%%, availability=%.2f%%]",