The Test Menu is a menu alternative to the Home Menu (the default menu that starts up on regular 3DSs). It can be enabled by changing the 'Menu' option under "Other Setting" in the Config Menu to 'Test Menu'. The test menu seems to vary upon firmware revisions. But for firmware 0.15.8 (r37901), looks like this:
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The Test Menu is a menu alternative to the Home Menu (the default menu that starts up on regular 3DSs). It can be enabled by changing the 'Menu' option under "Other Setting" in the Config Menu to 'Test Menu', or by using the CTR Menu Selector(this is a Developer App which can be found . The test menu seems to vary upon firmware revisions. But for firmware 0.15.8 (r37901), looks like this: