UUID uuid = new UUID(rpcUuid);

            // Act
            String result = uuid.toString();

            // Assert
            assertEquals("00000000-0000-0000-0000-000000000000", result, "toString() should correctly format zero UUID");
        }

        @Test
        @DisplayName("toString() should handle maximum values correctly")
        void testToStringMaxValues() {

							}
						}
					}
					var ei erasureInfo
					if err := json.Unmarshal(buf.Bytes(), &ei); err == nil && ei.V2Obj != nil {
						verID := uuid.UUID(header.VersionID).String()
						if verID == "00000000-0000-0000-0000-000000000000" {
							// If the version ID is all zeros, use the signature as version ID.
							verID = fmt.Sprintf("null/%08x", header.Signature)
							v0 = verID
						}
						idx := ei.V2Obj.EcIndex

	tmp[0] = 0xce // muint32
	binary.BigEndian.PutUint32(tmp[1:], uint32(xxhash.Sum64(dst[dataOffset:])))
	dst = append(dst, tmp[:5]...)
	return append(dst, x.data...), nil
}

const emptyUUID = "00000000-0000-0000-0000-000000000000"

func (x *xlMetaV2) findVersionStr(key string) (idx int, ver *xlMetaV2Version, err error) {
	if key == nullVersionID {
		key = ""
	}
	var u uuid.UUID
	if key != "" {

    )
    assertInvalid(
      "http://[0000:0000:0000:0000:0000:0000:0000:0001:]",
      "Invalid URL host: \"[0000:0000:0000:0000:0000:0000:0000:0001:]\"",
    )
    assertInvalid(
      "http://[0000:0000:0000:0000:0000:0000:0000:0001::]",
      "Invalid URL host: \"[0000:0000:0000:0000:0000:0000:0000:0001::]\"",
    )
    assertInvalid(
      "http://[0000:0000:0000:0000:0000:0000:0000:0001:::]",

func TestParseHexUint(t *testing.T) {
	type testCase struct {
		in      string
		want    uint64
		wantErr string
	}
	tests := []testCase{
		{"x", 0, "invalid byte in chunk length"},
		{"0000000000000000", 0, ""},
		{"0000000000000001", 1, ""},
		{"ffffffffffffffff", 1<<64 - 1, ""},
		{"FFFFFFFFFFFFFFFF", 1<<64 - 1, ""},
		{"000000000000bogus", 0, "invalid byte in chunk length"},