So, if you play MineTest on your PC, you should probably know what MineTest texture packs are. I just started playing the Android port, and I spent a while trying to get a texture pack. Here's my tutorial! Remember, this is for ANDROID, not the PC version.
Step 1: Downloading the texture pack.
Simply download the texture pack that you want to use.
Step 2: Get a file manager, I use ES File Manager :)
Step 3: Open and extract the pack, as so
Step 4: Go to this directory: sdcard>MineTest
Step 5: Open the folder and locate 'textures'
Step 6: Go back to your downloads folder and copy the extracted pack, then, after you copied it, rename it 'pack' then go back to the MineTest folder, then: MineTest>textures>base, then paste the file in there
Step 7: You should get a screen like this:
Just click Apply To All then overwrite.
Step 8: Open MineTest and enjoy!