I am not too sure about
mongosh> show dbs
data 73.7 kB
equipoule 21.7 MB
forums 41 kB
nota_bene_test 115 kB
poem 41 kB
prototype 582 kB
salon 22.7 MB
test 213 kB
zoo 111 kB
admin 348 kB
local 3.13 GB
mongosh> use Tin_Cvitkovic
'switched to db Tin_Cvitkovic'
mongosh> show dbs
data 73.7 kB
equipoule 21.7 MB
forums 41 kB
nota_bene_test 115 kB
poem 41 kB
prototype 582 kB
salon 22.7 MB
test 213 kB
zoo 111 kB
admin 348 kB
local 3.13 GB
However it does get created if you insert into a collection.
mongosh> db.test.insertOne( { _id : 1})
{ acknowledged: true, insertedId: 1 }
mongosh> show dbs
Tin_Cvitkovic 8.19 kB
data 73.7 kB
equipoule 21.7 MB
forums 41 kB
nota_bene_test 115 kB
poem 41 kB
prototype 582 kB
salon 22.7 MB
test 213 kB
zoo 111 kB
admin 348 kB
local 3.13 GB