public void test_mixedAlphabet() throws Exception {
        FullWidthToHalfWidthAlphabetNormalizer normalizer = new FullWidthToHalfWidthAlphabetNormalizer();

        String result = normalizer.normalize("ＡｂＣｄＥｆ", "field");

        assertEquals("AbCdEf", result);
    }

    @Test
    public void test_emptyString() throws Exception {
        FullWidthToHalfWidthAlphabetNormalizer normalizer = new FullWidthToHalfWidthAlphabetNormalizer();

import okio.buffer

class ResponseCommonTest {
  @Test fun peekShorterThanResponse() {
    val response = newResponse(responseBody("abcdef"))
    val peekedBody = response.peekBody(3)
    assertThat(peekedBody.string()).isEqualTo("abc")
    assertThat(response.body.string()).isEqualTo("abcdef")
  }

  @Test fun peekLongerThanResponse() {
    val response = newResponse(responseBody("abc"))
    val peekedBody = response.peekBody(6)

  public void testAddEscapes() {
    char[] cs = {'a', 'b', 'c'};
    CharEscaperBuilder builder = new CharEscaperBuilder().addEscapes(cs, "Z");
    Escaper escaper = builder.toEscaper();
    assertThat(escaper.escape("abcdef")).isEqualTo("ZZZdef");
  }

        // Test case 3: Double padding
        final byte[] data3 = "abcde".getBytes();
        assertEquals("YWJjZGU=", Base64Util.encode(data3));

        // Test case 4: No padding
        final byte[] data4 = "abcdef".getBytes();
        assertEquals("YWJjZGVm", Base64Util.encode(data4));
    }