The following tests are not emoji-safe:

```
TEST                     | STATUS    | DURATION

feature_config_args.py   | ✖ Failed  | 17 s
feature_includeconf.py   | ✖ Failed  | 11 s
interface_bitcoin_cli.py | ✖ Failed  | 8 s
wallet_multiwallet.py    | ✖ Failed  | 6 s

ALL                      | ✖ Failed  | 42 s (accumulated) 
Runtime: 17 s
```
{
    switch (mode & ~std::ios_base::ate) {
    case std::ios_base::out:
    case std::ios_base::out | std::ios_base::trunc:
        return "w";
    case std::ios_base::out | std::ios_base::app:
    case std::ios_base::app:
        return "a";
    case std::ios_base::in:
        return "r";
    case std::ios_base::in | std::ios_base::out:
        return "r+";
    case std::ios_base::in | std::ios_base::out | std::ios_base::trunc:
        return "w+";
    case std::ios_base::in | std::ios_base::out | std::ios_base::app:
    case std::ios_base::in | std::ios_base::app:
        return "a+";
    case std::ios_base::out | std::ios_base::binary:
    case std::ios_base::out | std::ios_base::trunc | std::ios_base::binary:
        return "wb";