These 4 addresses control what menu you're currently in on the Test Menu (these will work for SSF2 and SSF2T).  You should be able to add these to your Artmoney table if you're using Kawaks as an emulator, and it's in Artmoney's emulator list.

FF8000 - Setting this to 0004 will send you into whatever menu your cursor is on in the main test menu.  It's 0002 on the Test Menu screen.

FF8004 - Setting this to any even value from 0000 to 0010 will modify what menu you're in on the main menu.

FF8008 - Setting this to 0004 will send you into whatever menu your cursor is on in the Character menu.

FF800C - Setting this to any even value from 0000 to 0008 will modify what menu you go to in the Character menu.

Example: Using the above, if I wanted to go into Scroll 3 Test from the main menu: I'd change the values to those addresses like so:

FF8000 0004
FF8004 000E
FF8008 0004
FF800C 0006

I've been using the 1st one mostly, but I've also been able to do it a couple of times with the 2nd one.

BTW, the Mad Predator won't have the correct colors at first.  Use 3P Button 3 to fix that (press it 4 times).

To use:
Press F2 to go to the test menu, then turn on the cheat.  The screen will change to the character test screen.  If you're unable to access the cheat option, check "You may not have access to the cheat option when you press Tab.  Maybe this can help." in this thread.

The buttons:
P1 Coin: Affects the text and BG.  Had I known about this, I wouldn't have searched for a cheat to hide the text. :p

2P Start: Changes the background color two ways: Holding it causes gradual changes in color, tapping it causes sudden changes.

Hold P1 Button 2 and press either Up or Down: Changes what sprite set you want to look at.  Use this to find Lynn's sprites.  To get to Lynn, press up 12 to 16 times.

1P Up or Down: Changes what sprite set you want to look at.  Use this to go through all of Lynn's animations.

1P Left or Right: Changes what direction the sprite's facing.

3P Up or Down: Flips the sprite up or down.

3P Button 3: Changes the palette the sprite's using.  This is useful for portraits, and BG things.

Hold P1 Button 1: Quickly goes through the frames to an animation.

P1 Button 2: Resets animation to first frame.

P1 Button 3: Cycle frame by frame through an animation.

There may be more things that it can do, but that's what I found playing around with it.  Also, it's possible there's some functions to this that're unusable.  I say this because of the multiple Nage Tests I found that had varying degrees of functionality.