Most recent failure [on master](https://cirrus-ci.com/task/6073953614561280) (https://github.com/bitcoin/bitcoin/commit/567670bec5ecf9bc252e91370382be53fd81ccee):
```bash
 test  2021-06-23T11:18:18.969000Z TestFramework.node0 (DEBUG): Node stopped 
 test  2021-06-23T11:18:18.969000Z TestFramework.bitcoincli (DEBUG): Running bitcoin-cli ['-rpcwait', '-rpcwaittimeout=5', 'echo'] 
 test  2021-06-23T11:18:23.001000Z TestFramework (ERROR): Assertion failed 
                                   Traceback (most recent call last):
                                     File "/tmp/cirrus-build/ci/scratch/build/bitcoin-x86_64-pc-linux-gnu/test/functional/test_framework/test_framework.py", line 128, in main
                                       self.run_test()
                                     File "/tmp/cirrus-build/ci/scratch/build/bitcoin-x86_64-pc-linux-gnu/test/functional/interface_bitcoin_cli.py", line 257, in run_test
                                       assert_greater_than_or_equal(time.time(), start_time + 5)
                                     File "/tmp/cirrus-build/ci/scratch/build/bitcoin-x86_64-pc-linux-gnu/test/functional/test_framework/util.py", line 61, in assert_greater_than_or_equal
                                       raise AssertionError("%s < %s" % (str(thing1), str(thing2)))
                                   AssertionError: 1624447103.0015192 < 1624447103.969648
 test  2021-06-23T11:18:23.004000Z TestFramework (DEBUG): Closing down network thread 
 test  2021-06-23T11:18:23.055000Z TestFramework (INFO): Stopping nodes 
```
{
    if (result.isNull()) return;
    strPrint = result.isStr() ? result.get_str() : result.write(2);
}
static void ParseError(const UniValue& error, std::string& strPrint, int& nRet)
{
    if (error.isObject()) {
        const UniValue& err_code = find_value(error, "code");
        const UniValue& err_msg = find_value(error, "message");
        if (!err_code.isNull()) {
            strPrint = "error code: " + err_code.getValStr() + "\n";
        }
        if (err_msg.isStr()) {
            strPrint += ("error message:\n" + err_msg.get_str());
        }
        if (err_code.isNum() && err_code.get_int() == RPC_WALLET_NOT_SPECIFIED) {
            strPrint += "\nTry adding \"-rpcwallet=<filename>\" option to bitcoin-cli command line.";
        }
    } else {
        strPrint = "error: " + error.write();
    }
    nRet = abs(error["code"].get_int());
}
/**
 * GetWalletBalances calls listwallets; if more than one wallet is loaded, it then
 * fetches mine.trusted balances for each loaded wallet and pushes them to `result`.
 *
 * @param result  Reference to UniValue object the wallet names and balances are pushed to.
 */
static void GetWalletBalances(UniValue& result)