zhenghua <******@****.***> 1492724018 -0700

    assertEquals(LOWER, Ascii.toLowerCase(UPPER));
    assertSame(LOWER, Ascii.toLowerCase(LOWER));
    assertEquals(IGNORED, Ascii.toLowerCase(IGNORED));
    assertEquals("foobar", Ascii.toLowerCase("fOobaR"));
  }

  public void testToUpperCase() {
    assertEquals(UPPER, Ascii.toUpperCase(LOWER));
    assertSame(UPPER, Ascii.toUpperCase(UPPER));
    assertEquals(IGNORED, Ascii.toUpperCase(IGNORED));

    @Override
    String normalizeWord(String word) {
      return Ascii.toUpperCase(word);
    }

    @Override
    String convert(CaseFormat format, String s) {
      if (format == LOWER_HYPHEN) {
        return Ascii.toLowerCase(s.replace('_', '-'));
      }
      if (format == LOWER_UNDERSCORE) {
        return Ascii.toLowerCase(s);
      }
      return super.convert(format, s);
    }
  };

     * Tests if the terminal's charset can encode the Unicode character,
     * falling back to ASCII if not.
     *
     * @param terminal the terminal to get the icon for
     * @return the Unicode character if supported, otherwise the ASCII fallback
     */
    public String getIcon(Terminal terminal) {
        Charset charset = getTerminalCharset(terminal);

    @Override
    String normalizeWord(String word) {
      return Ascii.toUpperCase(word);
    }

    @Override
    String convert(CaseFormat format, String s) {
      if (format == LOWER_HYPHEN) {
        return Ascii.toLowerCase(s.replace('_', '-'));
      }
      if (format == LOWER_UNDERSCORE) {
        return Ascii.toLowerCase(s);
      }
      return super.convert(format, s);
    }
  };

    return NONALPHA.charAt(random.nextInt(NONALPHA.length()));
  }

  @Benchmark
  int asciiStringToUpperCase(int reps) {
    String string = noWorkToDo ? Ascii.toUpperCase(testString) : testString;

    int dummy = 0;
    for (int i = 0; i < reps; i++) {
      dummy += Ascii.toUpperCase(string).length();
    }
    return dummy;
  }

  @Benchmark
  int asciiCharSequenceToUpperCase(int reps) {

        assertEquals("•", ConsoleIcon.DETAIL.getIcon(mockTerminal));
        assertEquals("→", ConsoleIcon.ACTION.getIcon(mockTerminal));
    }

    @Test
    @DisplayName("should return ASCII fallback when terminal uses US-ASCII")
    void shouldReturnAsciiFallbackWhenTerminalUsesAscii() {
        Terminal mockTerminal = mock(Terminal.class);
        when(mockTerminal.encoding()).thenReturn(StandardCharsets.US_ASCII);

    return NONALPHA.charAt(random.nextInt(NONALPHA.length()));
  }

  @Benchmark
  int asciiStringToUpperCase(int reps) {
    String string = noWorkToDo ? Ascii.toUpperCase(testString) : testString;

    int dummy = 0;
    for (int i = 0; i < reps; i++) {
      dummy += Ascii.toUpperCase(string).length();
    }
    return dummy;
  }

  @Benchmark
  int asciiCharSequenceToUpperCase(int reps) {

        } catch (final UnsupportedEncodingException e) {
            return host;
        }
    }

    /**
     * Converts the given host string to ASCII using IDN.
     *
     * @param host the host string to convert
     * @return the ASCII representation of the host string
     */
    protected String toAscii(final String host) {
        return IDN.toASCII(decode(host), flag);
    }

    /**

   * This is like [toLowerCase] except that it does nothing if this contains any non-ASCII
   * characters. We want to avoid lower casing special chars like U+212A (Kelvin symbol) because
   * they can return ASCII characters that match real hostnames.
   */
  private fun String.asciiToLowercase(): String =
    when {
      isAscii() -> lowercase(Locale.US) // This is an ASCII string.
      else -> this
    }