Add code formatting and update deprecations

[chick]

Add .scalafmt support to project
Format all scala files
Update deprecated usage of chiseltest and scalatest

[jackkoenig]

Approved, but should scalafmt also be checked in CI?

[Hidden-Seed]

I used Mill to build my project, and I tried running the command mill -i __.reformat, but it didn’t seem to format any files. I’m not sure if the source files are being detected correctly.

I also set override def millSourcePath = super.millSourcePath / os.up in my build.mill Could that affect Scalafmt’s behavior?

How can I check which files are being recognized by the formatter? Any suggestions would be appreciated!

[edwardcwang]

Hi @Knight112357 thanks for your interest in Chisel! You might want to start a discussion at https://github.com/chipsalliance/chisel-template/discussions rather than commenting on a 3-year-old issue :)

[Hidden-Seed]

Hi @edwardcwang thanks for your advice. Please see #138