Where do test coins come from, is there any kind of mining?
The OP makes an incorrect term. Testnet Bitcoin is abbreviated as t
BTC, not
BTC.
Testnet Bitcoin, theoritically has zero value, financially but people have to mine it. To mine, electricity, mining rigs are need (and of course human resources) so that there are actually input money. Consequently, t
BTC has output value somewhat.
Just remember if someone try to contact you (go first with PMs) and want to sell testnet Bitcoin t
BTC with value too high (of course lower than value of real Bitcoin
BTC), they are scammers.
To get t
BTC, you can visit some faucet pages or contact @mocacino.
Testnet Faucet:
You can get your testnet coins (for free, sure)
Bitcoin Testnet. Activate, experience it, but don't trade and get scammed.