[Help] How do make a Test ROM autodetect RAM $6000-7FFF

[Hamtaro126]

I was requesting a FCEUX feature to have UxROM use an optional Work/Battery RAM, but I must make a test rom to determine it being either Failing or Passing,

In short, How can I detect WRAM automatically (so I can make a test ROM)?

[rainwarrior]

Write to it, and read back the value. If you can't make the read value change by writing it, it's not RAM.