             XCTAssertEqual(characteristic.organizationallyUniqueIdentifier, 0x0000000000000000)
             XCTAssertEqual(characteristic.description, "0000000000000000")
             XCTAssertEqual(characteristic.rawValue, 0x0000000000000000)
-            XCTAssertEqual(characteristic.hashValue, UInt64.min.hashValue)
             XCTAssertEqual(GATTSystemID(data: data), GATTSystemID(data: data))
         }
         

            XCTAssertEqual(characteristic.organizationallyUniqueIdentifier, 16777215)
            XCTAssertEqual(characteristic.description, "FFFFFFFFFFFFFFFF")
            XCTAssertEqual(characteristic.rawValue, 0xFFFFFFFFFFFFFFFF)
            XCTAssertEqual(characteristic.hashValue, UInt64.max.hashValue)
            XCTAssertEqual(GATTSystemID(data: data), GATTSystemID(data: data))
        }
    }

            XCTAssertEqual(characteristic.organizationallyUniqueIdentifier, organizationallyUniqueIdentifier)
            XCTAssertEqual(characteristic.description, "123456FFFE9ABCDE")
            XCTAssertEqual(characteristic.rawValue, 0x123456FFFE9ABCDE)
            XCTAssertEqual(characteristic.data, data)
            XCTAssertEqual(characteristic, GATTSystemID(data: data))
            XCTAssertEqual(characteristic, GATTSystemID(address: address))
