Javascript libraries for neo wallet using https://github.com/neochainio/neowallet/blob/master/js/wallet.js as the original source.
npm run test
npm run build
Check the test/index.js for examples on some basic wallet actions
It seems like the testnet API can at times crap out. If the block height at http://testnet.antchain.org/ (which is where the testnet API resides) is not keeping up to date with the block height at http://testnet.antcha.in/blocks then this may usually be a sign that there may be a problem with certain calls. For example calls to get wallet balance may be out of sync and sending transactions may fail.