can't find bit.tst script

[paul23]

I've tested several chips with no problem.
Today, I edited the bit.hdl. When I tried to test it, I couldn't find the bit.tst script.
All the script files were grayed not.
I tried to go back to find a test script for a chip I had already tested, and still got all grayed-out script files.
Please help!!!

[paul23]

I found the bit.tst script in the /nand2tetris/projects/03/a folder!