builder.addHeader("", "Value")
    }
  }

  @Test
  fun headerAllowsTabOnlyInValues() {
    val builder = Request.Builder()
    builder.header("key", "sample\tvalue")
    assertFailsWith<IllegalArgumentException> {
      builder.header("sample\tkey", "value")
    }
  }

  @Test
  fun headerForbidsControlCharacters() {
    assertForbiddenHeader("\u0000")

        assertEquals("\"  another  \"", result[1]);

        // Tab characters - quoted value keeps quotes
        value = "tab\tvalue,\"quoted\ttab\"";
        result = KuromojiCSVUtil.parse(value);
        assertEquals(2, result.length);
        assertEquals("tab\tvalue", result[0]);
        assertEquals("\"quoted\ttab\"", result[1]);
    }

    public void test_parse_invalid_quotes() {
        String value;

      builder.addHeader("", "Value")
    }
  }

  @Test
  fun headerAllowsTabOnlyInValues() {
    val builder = Request.Builder()
    builder.header("key", "sample\tvalue")
    assertFailsWith<IllegalArgumentException> {
      builder.header("sample\tkey", "value")
    }
  }

  @Test
  fun headerForbidsControlCharacters() {
    assertForbiddenHeader("\u0000")