mapCache.put("A", "A_value");
    mapCache.put("B", "B_value");
    mapCache.put("C", "C_value");

    assertThat(mapCache.unmodifiableKeySet()).hasSize(3);
    for (String key : mapCache.unmodifiableKeySet()) {
      assertThat(mapCache.get(key)).isEqualTo(key + "_value");
    }
  }

  @Test
  public void testPutNewValue() {
    assertThat(mapCache.put("key", "value")).isNull();

func FromTimestamp(t time.Time) *Value {
	return &Value{value: t}
}

// FromNull creates a Value with Null value
func FromNull() *Value {
	return &Value{value: nil}
}

// FromMissing creates a Value with Missing value
func FromMissing() *Value {
	return &Value{value: Missing{}}
}

// FromBytes creates a Value from a []byte
func FromBytes(b []byte) *Value {
	return &Value{value: b}
}

func (GobSerializer) Scan(ctx context.Context, field *Field, dst reflect.Value, dbValue interface{}) (err error) {
	fieldValue := reflect.New(field.FieldType)

	if dbValue != nil {
		var bytesValue []byte
		switch v := dbValue.(type) {
		case []byte:
			bytesValue = v
		default:
			return fmt.Errorf("failed to unmarshal gob value: %#v", dbValue)
		}
		if len(bytesValue) > 0 {

	switch value := dbValue.(type) {
	case []byte:
		*es = EncryptedString(bytes.TrimPrefix(value, []byte("hello")))
	case string:
		*es = EncryptedString(strings.TrimPrefix(value, "hello"))
	default:
		return fmt.Errorf("unsupported data %#v", dbValue)
	}
	return nil
}

        map.compute(
            key,
            (K k, @Nullable Long value) ->
                updaterFunction.applyAsLong(value == null ? 0L : value.longValue()));
    return requireNonNull(result);
  }

  /**
   * Updates the value currently associated with {@code key} with the specified function, and
   * returns the old value. If there is not currently a value associated with {@code key}, the
   * function is applied to {@code 0L}.

						this._goRefCounts[id]--;
						if (this._goRefCounts[id] === 0) {
							const v = this._values[id];
							this._values[id] = null;
							this._ids.delete(v);
							this._idPool.push(id);
						}
					},

					// func stringVal(value string) ref
					"syscall/js.stringVal": (sp) => {
						sp >>>= 0;
						storeValue(sp + 24, loadString(sp + 8));
					},

		wantParts = nParts
	}
	bvalue, err := base64.StdEncoding.DecodeString(value)
	if err != nil {
		return nil
	}
	c := Checksum{Type: alg, Encoded: value, Raw: bvalue, WantParts: wantParts}
	if !c.Valid() {
		return nil
	}
	return &c
}

// NewChecksumString returns a new checksum from specified algorithm and base64 encoded value.
func NewChecksumString(alg, value string) *Checksum {

        .add("\tkey\t:\tvalue\t") // '\t' also counts as whitespace
        .add("ping:  pong  ") // Value whitespace is trimmed.
        .add("kit:kat") // Space after colon is not required.
        .build()
    assertThat(headers.values("foo")).containsExactly("bar", "baz", "bak")
    assertThat(headers.values("key")).containsExactly("value")
    assertThat(headers.values("ping")).containsExactly("pong")

      builder.header("", "Value")
    }
    assertFailsWith<IllegalArgumentException> {
      builder.addHeader("", "Value")
    }
  }

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

  @Test

      builder.header("", "Value")
    }
    assertFailsWith<IllegalArgumentException> {
      builder.addHeader("", "Value")
    }
  }

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

  @Test