Feat: code refactoring and jest tests

chore: More refactoring

chore: More tests and refactors

fix: Fixed age not getting calculated properly

chore: Implemented mocking in jest

chore: More mock tests

chore: checkStuckScreen tests

lib/notifier/codes.js

@@ -0,0 +1,34 @@
+const T = require('../time')
+
+const PING = 'PING'
+const STALE = 'STALE'
+const LOW_CRYPTO_BALANCE = 'LOW_CRYPTO_BALANCE'
+const HIGH_CRYPTO_BALANCE = 'HIGH_CRYPTO_BALANCE'
+const CASH_BOX_FULL = 'CASH_BOX_FULL'
+const LOW_CASH_OUT = 'LOW_CASH_OUT'
+
+const CODES_DISPLAY = {
+  PING: 'Machine Down',
+  STALE: 'Machine Stuck',
+  LOW_CRYPTO_BALANCE: 'Low Crypto Balance',
+  HIGH_CRYPTO_BALANCE: 'High Crypto Balance',
+  CASH_BOX_FULL: 'Cash box full',
+  LOW_CASH_OUT: 'Low Cash-out'
+}
+
+const NETWORK_DOWN_TIME = 1 * T.minute
+const STALE_STATE = 7 * T.minute
+const ALERT_SEND_INTERVAL = T.hour
+
+module.exports = {
+  PING,
+  STALE,
+  LOW_CRYPTO_BALANCE,
+  HIGH_CRYPTO_BALANCE,
+  CASH_BOX_FULL,
+  LOW_CASH_OUT,
+  CODES_DISPLAY,
+  NETWORK_DOWN_TIME,
+  STALE_STATE,
+  ALERT_SEND_INTERVAL
+}