Where can I get test coins to try the Atomic Swap?
Test MNX can be easily mined. To do this, type “ -testnet” parameter in the command line or put “testnet=1” into config file when starting the Wallet. All coins you'll mine would be the test ones. You can use them in Atomic Swap transactions.
To receive test BTC, please use any of the available BTC testnet faucets like https://testnet.coinfaucet.eu/en/