def METHOD_NAME(self):
    passphrase = "WalletPassphrase"
    passphrase2 = "SecondWalletPassphrase"
    # Make sure the wallet isn't encrypted first
    msg = "test message"
    address = self.nodes[0].getnewaddress(address_type='legacy')
    sig = self.nodes[0].signmessage(address, msg)
    assert self.nodes[0].verifymessage(address, sig, msg)
    assert_raises_rpc_error(-15, "Error: running with an unencrypted wallet, but walletpassphrase was called", self.nodes[0].walletpassphrase, 'ff', 1)
    assert_raises_rpc_error(-15, "Error: running with an unencrypted wallet, but walletpassphrasechange was called.", self.nodes[0].walletpassphrasechange, 'ff', 'ff')
    # Encrypt the wallet
    assert_raises_rpc_error(-8, "passphrase cannot be empty", self.nodes[0].encryptwallet, '')
    self.nodes[0].encryptwallet(passphrase)
    # Test that the wallet is encrypted
    assert_raises_rpc_error(-13, "Please enter the wallet passphrase with walletpassphrase first", self.nodes[0].signmessage, address, msg)
    assert_raises_rpc_error(-15, "Error: running with an encrypted wallet, but encryptwallet was called.", self.nodes[0].encryptwallet, 'ff')
    assert_raises_rpc_error(-8, "passphrase cannot be empty", self.nodes[0].walletpassphrase, '', 1)
    assert_raises_rpc_error(-8, "passphrase cannot be empty", self.nodes[0].walletpassphrasechange, '', 'ff')
    # Check that walletpassphrase works
    self.nodes[0].walletpassphrase(passphrase, 2)
    sig = self.nodes[0].signmessage(address, msg)
    assert self.nodes[0].verifymessage(address, sig, msg)
    # Check that the timeout is right
    time.sleep(3)
    assert_raises_rpc_error(-13, "Please enter the wallet passphrase with walletpassphrase first", self.nodes[0].signmessage, address, msg)
    # Test wrong passphrase
    assert_raises_rpc_error(-14, "wallet passphrase entered was incorrect", self.nodes[0].walletpassphrase, passphrase + "wrong", 10)
    # Test walletlock
    self.nodes[0].walletpassphrase(passphrase, 84600)
    sig = self.nodes[0].signmessage(address, msg)
    assert self.nodes[0].verifymessage(address, sig, msg)
    self.nodes[0].walletlock()
    assert_raises_rpc_error(-13, "Please enter the wallet passphrase with walletpassphrase first", self.nodes[0].signmessage, address, msg)
    # Test passphrase changes
    self.nodes[0].walletpassphrasechange(passphrase, passphrase2)
    assert_raises_rpc_error(-14, "wallet passphrase entered was incorrect", self.nodes[0].walletpassphrase, passphrase, 10)
    self.nodes[0].walletpassphrase(passphrase2, 10)
    sig = self.nodes[0].signmessage(address, msg)
    assert self.nodes[0].verifymessage(address, sig, msg)
    self.nodes[0].walletlock()
    # Test timeout bounds
    assert_raises_rpc_error(-8, "Timeout cannot be negative.", self.nodes[0].walletpassphrase, passphrase2, -10)
    self.log.info('Check a timeout less than the limit')
    MAX_VALUE = 100000000
    now = int(time.time())
    self.nodes[0].setmocktime(now)
    expected_time = now + MAX_VALUE - 600
    self.nodes[0].walletpassphrase(passphrase2, MAX_VALUE - 600)
    actual_time = self.nodes[0].getwalletinfo()['unlocked_until']
    assert_equal(actual_time, expected_time)
    self.log.info('Check a timeout greater than the limit')
    expected_time = now + MAX_VALUE
    self.nodes[0].walletpassphrase(passphrase2, MAX_VALUE + 1000)
    actual_time = self.nodes[0].getwalletinfo()['unlocked_until']
    assert_equal(actual_time, expected_time)
    self.nodes[0].walletlock()
    # Test passphrase with null characters
    passphrase_with_nulls = "Phrase\0With\0Nulls"
    self.nodes[0].walletpassphrasechange(passphrase2, passphrase_with_nulls)
    # walletpassphrasechange should not stop at null characters
    assert_raises_rpc_error(-14, "wallet passphrase entered was incorrect", self.nodes[0].walletpassphrase, passphrase_with_nulls.partition("\0")[0], 10)
    self.nodes[0].walletpassphrase(passphrase_with_nulls, 10)
    sig = self.nodes[0].signmessage(address, msg)
    assert self.nodes[0].verifymessage(address, sig, msg)
    self.nodes[0].walletlock()