Failed test 'database_connection_failed hook fires'

t/01-basic.t seems to fail sometimes like this:
```
# Failed test 'database_connection_failed hook fires'
# at t/01-basic.t line 247.
# got: ''
# expected: '1'
# Looks like you failed 1 test of 43.
t/01-basic.t ......
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/43 subtests
```

This seems to be rare, by looking at http://matrix.cpantesters.org/?dist=Dancer2-Plugin-Database%202.17;reports=1#sl=7,1