for ((key, value) in authParams) {
      val newKey = key?.lowercase(US)
      newAuthParams[newKey] = value
    }
    this.authParams = newAuthParams.unmodifiable()
  }

  /** Returns a copy of this charset that expects a credential encoded with [charset]. */
  fun withCharset(charset: Charset): Challenge {
    val authParams = this.authParams.toMutableMap()
    authParams["charset"] = charset.name()

| Params     | Value    |
| :--        | :--      |
| *Type*     | *String* |
| *Required* | *Yes*    |

### AUTHPARAMS

  }

  @Test
  fun challenge() {
    var challenge = Challenge("", mapOf("" to ""))
    challenge = Challenge("", "")
    val scheme: String = challenge.scheme
    val authParams: Map<String?, String> = challenge.authParams
    val realm: String? = challenge.realm
    val charset: Charset = challenge.charset
    val utf8: Challenge = challenge.withCharset(Charsets.UTF_8)
  }

  @Test
  fun cipherSuite() {

	public final fun -deprecated_scheme ()Ljava/lang/String;
	public fun <init> (Ljava/lang/String;Ljava/lang/String;)V
	public fun <init> (Ljava/lang/String;Ljava/util/Map;)V
	public final fun authParams ()Ljava/util/Map;
	public final fun charset ()Ljava/nio/charset/Charset;
	public fun equals (Ljava/lang/Object;)Z
	public fun hashCode ()I
	public final fun realm ()Ljava/lang/String;

	public final fun -deprecated_scheme ()Ljava/lang/String;
	public fun <init> (Ljava/lang/String;Ljava/lang/String;)V
	public fun <init> (Ljava/lang/String;Ljava/util/Map;)V
	public final fun authParams ()Ljava/util/Map;
	public final fun charset ()Ljava/nio/charset/Charset;
	public fun equals (Ljava/lang/Object;)Z
	public fun hashCode ()I
	public final fun realm ()Ljava/lang/String;