message: Document running Ledger tests
diff: @@ -53,6 +53,25 @@ http://localhost:8000/demo.
  Then follow the instructions on that page.
  +## Runnng tests
  +
  +The tests in this package require a Ledger device initialized with the mnemonic
  +from
  +[scripts/wasmd/README.md#preset-accounts](https://github.com/CosmWasm/cosmjs/blob/master/scripts/wasmd/README.md#preset-accounts)
  +(see "Ledger: accounts for Ledger based demos and tests") with an installed
  +"Cosmos (ATOM)" app. The device must be connected via USB, unlocked and the
  +Cosmos app must be opened. The tests require the user to manually approve
  +transactions. Start a local wasmd blockchain as described in
  +[scripts/wasmd/README.md](https://github.com/CosmWasm/cosmjs/blob/master/scripts/wasmd/README.md)
  +and execute:
  +
  +```sh
  +export LEDGER_INTERACTIVE_ENABLED=1
  +export LEDGER_ENABLED=1
  +export WASMD_ENABLED=1
  +yarn test
  +```
  +
  ## License
  This package is part of the cosmjs repository, licensed under the Apache License
  