Open existing db in memory mode

[Mythli]

Dear better-sqlite3 contributors,

Thank you for the amazing library. Your effort has enabled uncountable amazing products to be build that are faster than without this library.

For integration testing I would like to open an existing database file in memory mode, so that further changes are not persisted. Is such a thing possible?

sqlite(process.env.database, {memory: true}),

gives me the error TypeError: Option "memory" was removed in v7.0.0 (use ":memory:" filename instead)

I can use the :memory: file string but then all migrations and seeders need to be re-run which slows down the tests considerably.
I also tried test.sqlite3?mode=memory&cache=shared but this just creates a db with the connection string as name.

[Prinzhorn]

1. Read file as buffer
2. Pass buffer to new Database(buf)

I also tried test.sqlite3?mode=memory&cache=shared but this just creates a db with the connection string as name.

See #483

[Mythli]

Danke, 10/10 // Thanks, 10/10!